We are working on building a calculator for every computation life throws at you - from the serious to the whimsical.
Compute the mass of crushed limestone required to neutralize an acidic lake and raise its pH.
Estimate the carbon emissions produced by training machine learning models. Input GPU hours, power usage, and local electricity carbon intensity.
Compute air changes per hour and required ventilation flow for interior spaces based on room volume and airflow.
Estimate the electricity cost difference between using an air fryer and a conventional oven.
Determine the recommended Clean Air Delivery Rate for your space. Enter room dimensions and desired air changes to pick the best air purifier.
Estimate AQI from PM2.5 and PM10 concentrations. Learn how air quality is classified and why it matters for health and outdoor activities.
Estimate the warming impact of aircraft contrails from flight distance, fuel burn, and forcing index.
Estimate biodiesel production and carbon dioxide fixation from a microalgae cultivation system.
Estimate the biofilter area needed for a recirculating aquaculture system using feed rate and nitrification capacity.
Design a thriving aquaponics setup by matching fish tank volume with grow bed size and pump flow. Learn how to maintain a healthy ecosystem.
Calculate the CO2 injection rate for your aquarium by entering tank volume, current CO2 level, and target concentration. Discover tips for healthy plants and fish.
Determine ideal aquarium lighting hours based on tank type and natural daylight. Learn how proper schedules promote healthy fish and plants.
Determine how much water to add or remove to reach the ideal salinity for your marine aquarium.
Estimate the number of fish that can comfortably live in your aquarium. Enter tank volume and average fish size to get a starting recommendation, along with tips for proper filtration and maintenance.
Estimate how often and how much water to change in your aquarium based on tank size, waste load, and filtration.
Project when a groundwater aquifer may run dry using recharge, extraction, growth, and climate trends.
Determine the maximum exposure time before star trails appear using focal length and sensor crop factor.
Estimate flood probability from atmospheric river events using integrated vapor transport, duration, soil saturation, and watershed area.
Determine insulation thickness, volume, and bag counts for your attic based on area, desired R-value, and material type.
Estimate the number of bees in your hive by entering frame count and bees per frame. Learn how colony population affects management and honey production.
Compare your current packaging expenses with biodegradable alternatives and see the cost premium per unit.
Estimate decomposition time for biodegradable plastics under landfill conditions.
Compute the board foot volume of a tree log using Smalian's formula. Enter log diameters and length to estimate usable lumber.
Convert butter amounts to equivalent oil and water or reverse the process for accurate baking substitutions.
Encode or decode messages using the classic Caesar substitution cipher.
Estimate when your car battery will likely need replacement using age, climate, and mileage.
Estimate how much you can save by carpooling to work or school. Enter distance, fuel efficiency, gas price, tolls, parking, and number of carpoolers to see the savings.
Estimate disinfection effectiveness by multiplying chlorine concentration and contact time and comparing to regulatory CT requirements.
Estimate steady-state CO₂ concentration and time to reach a threshold in a classroom based on ventilation and occupancy.
Design a garden that thrives amid shifting weather patterns. Estimate your climate resilience score based on zone, rainfall, and temperature.
Determine the ideal amount of water for your ground coffee using customizable brew ratios to craft pour over or drip coffee.
Determine the ideal coffee-to-water ratio for flavorful cold brew. Adjust batch size and dilution to craft smooth, delicious cold brew concentrate.
Estimate the carbon emissions from your daily commute. Enter travel distance, vehicle emission rate, work days, and weeks per year.
Determine how often to turn your compost based on pile temperature, moisture, and volume. Maintain balanced decomposition with this planning tool.
Find the ideal carbon to nitrogen ratio for your compost pile. Input amounts of green and brown materials to get instant feedback on how to reach the recommended 30:1 ratio.
Estimate microbial heat from compost piles and predict how long they can warm a water-filled tub.
Calculate the return on investment of a home composting setup by comparing avoided waste costs and fertilizer value.
Estimate how long it takes for kitchen scraps and yard waste to turn into usable compost. Enter pile size, temperature and moisture to forecast decomposition time.
Estimate water, cement, fine and coarse aggregate quantities for a concrete batch based on desired strength and slump using a simplified mix design method.
Determine accumulated thermal stress on coral reefs by summing weekly sea surface temperature anomalies over a selected period.
Calculate radiative forcing and approximate temperature change from variations in atmospheric CO₂ concentration using a logarithmic formula.
Gauge the probability of supply chain disruption for critical minerals using supplier concentration, geopolitical risk, demand growth, recycling, and substitution.
Predict total crop yield based on acreage, expected production per acre, and anticipated losses.
Instantly calculate Customer Lifetime Value (CLV) to better understand your customer's worth and optimize your marketing strategies. Perfect for ecommerce, SaaS, and subscription businesses.
Calculate the daylight factor for a room using outdoor and indoor light measurements or window parameters.
Estimate the number of daylight hours for any latitude and day of year and explore how Earth's tilt creates seasonal changes in insolation.
Estimate sediment plume spread from deep sea mining operations using release rate, particle settling velocity, current speed and depth.
Estimate annual diaper waste mass, volume, and long-term persistence in landfills.
Estimate the mass and volume of waste generated by daily use of disposable masks and compare it to familiar plastic items.
Estimate downstream dissolved oxygen using the Streeter–Phelps model with deoxygenation and reaeration rates.
Calculate potential profits from recycling electronic waste. Enter collection weight, revenue per kilogram, processing cost, and overhead to see net earnings.
Estimate the costs of a green burial or eco-friendly funeral service compared to a conventional ceremony.
Estimate annual carbon dioxide emissions for electric and gasoline cars and find when one is cleaner.
Compute the Oceanic Niño Index from three months of sea surface temperature anomalies to classify ENSO events.
Estimate how an electric vehicle battery's capacity declines with age, mileage, charge cycles, and climate. Plan future range by understanding degradation.
Determine the financial return from recycling electric vehicle batteries. Enter pack weight, recycling cost, recovered material value, and handling expenses to estimate profit and ROI.
Calculate daily irrigation volume based on reference evapotranspiration, crop coefficient, and area.
Compare greenhouse gas emissions for express air shipping versus ground delivery.
Determine how often to repaint your home's exterior based on siding material, climate, and sun exposure. Plan your next paint job with this easy calculator.
Calculate how much fertilizer you need based on area size, desired nutrient rate, and fertilizer grade.
Estimate the drive torque needed for a DIY filament extruder based on barrel diameter, extrusion pressure and drivetrain efficiency.
Determine the number of fireflies or other bioluminescent organisms needed to light a walkway at a desired lux level.
Approximate how long logs need to season before burning based on species, moisture and climate.
Estimate a sustainable catch limit based on biomass, growth rate, and exploitation percentage.
Estimate carbon emissions from a flight using origin and destination coordinates.
Estimate daily water collection from a fog harp given fog liquid water content, wind speed, collector area, and efficiency.
Determine how far you can see in foggy conditions using relative humidity and light extinction. Based on Koschmieder's law.
Estimate the ideal furnace size for your home using square footage, climate zone, insulation quality, and efficiency to compute BTU needs.
Find the best dates to start seeds and transplant your favorite vegetables based on your local frost date.
Evaluate how appealing your garden is to bees and butterflies using bloom variety, flower density, and habitat space.
Predict ground-level concentrations from a continuous point source using a simplified Gaussian plume model.
Estimate potential flood volume from a glacial lake breach using area, depth, and breach geometry.
Estimate annual mass balance of a glacier using accumulation, ablation, area and time.
Compute approximate meltwater volume generated by a glacier using area and melt depth.
Convert between decimal degrees and degrees-minutes-seconds for latitude and longitude. Learn how geographic coordinates work.
Convert wet grain weights to a standard moisture basis and calculate shrink losses.
Calculate the payback period for a home graywater recycling system based on installation cost, water savings, and usage.
Estimate waste diversion and leftover trash for eco-conscious events.
Calculate how much rainfall your green roof can absorb and retain based on roof area, soil depth, and rainfall amount.
Estimate the volume of rainfall a vegetated roof can retain and the probability of overflow during a storm.
Convert masses of CO2, methane, and nitrous oxide into total CO2 equivalent using 100-year global warming potentials and learn why equivalency metrics matter.
Estimate annual water savings and payback period for residential greywater reuse systems.
Calculate cumulative growing degree days from daily temperature data and a base temperature to plan crop development.
Calculate the cost of running an electric heat pump based on energy usage, electricity rates, and heating hours.
Estimate how much water to carry on a hike based on duration, temperature, and exertion.
Compare the cost per pound of homegrown vegetables to store-bought produce by accounting for seeds, equipment, water, and yield.
Estimate the years required for a home microgrid system to pay for itself. Enter installation costs, battery storage, and annual energy savings.
Estimate the moisture percentage in honey using a refractometer Brix reading so you know when frames are ready to harvest.
Compute soil infiltration capacity and cumulative infiltration over time using Horton's equation.
Estimate the financial and environmental impact of food discarded at home using waste mass, cost, and emissions factors.
Estimate how much of your household waste you divert from the landfill through recycling and composting.
Determine how much light your indoor plants need. Enter plant type and window direction to see recommended placement and care tips.
Convert text to HTML entities and decode entities back to characters.
Estimate hydrogen production, volume, and energy use for water electrolysis based on current, voltage, time, and efficiency.
Convert images to Base64 strings or decode Base64 back into images entirely within your browser.
Calculate a score that reflects indoor air quality based on CO2 levels, humidity, and VOC concentration.
Predict indoor carbon dioxide concentration based on room size, occupancy, and air changes per hour.
Estimate how much carbon dioxide indoor plants remove from a room based on plant count, species absorption rate and room size.
Estimate the recovery time for common injuries by combining severity, age, and rest quality.
Design a personalized intermittent fasting schedule with preset methods and a copyable timetable. Consult a professional if you have diabetes.
Estimate irrigation water needs from crop evapotranspiration, rainfall, and system efficiency to schedule watering.
Decode JWT tokens safely in your browser with this offline JWT decoder utility.
Estimate how long water stays in a lake using volume and inflow or outflow rates.
Estimate annual and cumulative methane generation from landfilled waste using a first-order decay approach.
Estimate the carbon footprint payback when replacing an old laptop with a newer, energy-efficient model.
Estimate leaf area index (LAI) from total leaf surface area and ground coverage to analyze crop or forest growth.
Determine daily amounts of two feeds to meet a desired crude protein level based on animal weight and intake.
Estimate daily water needs for different livestock species based on body weight, temperature, and herd size.
Estimate water flow in open channels using the Manning equation. Enter area, wetted perimeter, slope and roughness to compute discharge and velocity.
Estimate how many tons or gallons of manure are needed to meet crop nutrient goals based on manure analysis, field size, and nutrient availability.
Calculate how many grams of microplastic fibers your laundry may release per wash based on load weight, fabric type, and washing machine.
Assess mold growth risk based on temperature, humidity, exposure time, and material type using a simple mold index model.
Find the moon phase for any date with our Moon Phase Calculator. Learn about each lunar phase and how it influences tides, gardens, and traditions.
Plan your garden with the moon. Enter a starting date and crop type to see the best planting dates according to the lunar cycle.
Model the mass, thermal resistance, and compressive strength of a mycelium composite brick based on dimensions and density.
Estimate nitrate leaching from soil using concentration, drainage, and area inputs to assess groundwater contamination risk.
Convert numbers into English words and decode written numbers back to digits with this offline Number to Words converter.
Estimate how rising atmospheric CO₂ alters seawater pH using a simple Henderson–Hasselbalch approach based on alkalinity.
Estimate how long common plastics persist in the ocean under varying UV, temperature, and mechanical stress conditions.
Estimate radial and azimuthal components of the heliospheric magnetic field using the Parker spiral model.
Estimate the number of parking spaces required for a project based on building use, floor area, and local transit options.
Decompose simple rational expressions into partial fractions for easier integration.
Determine recommended south-facing glazing area for a passive solar greenhouse based on latitude and season.
Determine the optimal overhang length to shade windows in summer while admitting winter sun using latitude and solar geometry.
Plan how many hours of sun your patio receives throughout the year to optimize plantings and outdoor seating.
Plan the number of trees, shrubs, and ground covers for a garden bed using permaculture principles and plant spacing.
Estimate ground subsidence risk from permafrost thaw using temperature rise, ice content, load, drainage, and years.
Estimate performance decline of perovskite photovoltaic modules over time using initial efficiency, annual degradation and operational years.
Compute how much pesticide concentrate and water to mix for a desired spray volume and concentration. Avoid guesswork and keep applications precise.
Estimate ultimate and allowable bearing capacity for a single vertical pile using end bearing and skin friction in cohesive soils.
Compute a planet's equilibrium temperature from its stellar flux and albedo to understand climate conditions.
Estimate the subsolar magnetopause distance where solar wind pressure balances a planet's magnetic field.
Estimate plant available water from field capacity, wilting point, and root depth to evaluate soil moisture reserves.
Determine your USDA plant hardiness zone by entering your average annual extreme minimum temperature. Plan gardens with confidence.
Determine how often to water your plants by entering plant type, pot size, and environment. Learn tips to prevent overwatering and underwatering.
Estimate how much plastic waste you generate each year from common single-use items and explore ways to reduce your footprint.
Estimate the hours needed for scripting, recording, and editing your podcast episode with this calculator.
Quickly estimate the ideal liner size for a backyard pond. Enter pond length, width, and depth to find liner dimensions with overlap.
Estimate groundwater drawdown near a pumping well using the Thiem equation with flow rate, transmissivity, and radial distance.
Calculate the pressure exerted by electromagnetic radiation on a surface, including options for absorption or reflection.
Estimate how much rainwater you can harvest from your roof and find the right barrel size to meet your gardening needs.
Find the ideal rain garden size for your property using rainfall depth, impervious area, and soil absorption.
Project how much rainwater you can collect from your roof each year and evaluate tank overflow and days of supply based on daily usage.
Determine how much soil you need for new raised beds. Enter length, width, and depth to calculate volume, plus tips on soil mixes and layering.
Estimate financial and climate penalties when recycling loads exceed contamination limits.
Compute reference evapotranspiration ET0 using the FAO Penman‑Monteith equation with weather data inputs.
Estimate carbon dioxide equivalent emissions and potential cost from refrigerant leaks using charge amount, GWP, leak rate, and years of operation.
Estimate how quickly a roof insulation upgrade will pay for itself through reduced energy bills. Enter installation cost and expected monthly savings.
Calculate approximate roof snow loads using ground snow load, exposure, and thermal factors. Learn how roof slope and design considerations impact snow buildup.
Estimate remaining power output from satellite solar arrays based on mission duration, radiation flux, thermal cycling, and cell degradation coefficients.
Estimate basic decompression stop times for recreational dives using depth and bottom time.
Project cumulative sea level rise using annual rate and acceleration assumptions to explore climate change impacts.
Convert Secchi disk depth to turbidity, euphotic zone depth, and estimated chlorophyll concentration.
Estimate how many seeds are required for a field based on area, spacing, and germination rate.
Estimate how many plants fit in a garden bed based on row and plant spacing.
Input species counts to compute the Shannon diversity index and assess ecological diversity.
Compute the additional travel time experienced by light passing near a massive object using the Shapiro delay formula.
Compute bed shear stress and dimensionless Shields parameter to evaluate sediment mobilization in open channels.
Estimate the Shockley–Queisser detailed balance limit for a single-junction photovoltaic cell given the band gap and temperatures.
Compute a safe handheld shutter speed limit using focal length, crop factor, and image stabilization to minimize motion blur.
Calculate the electricity cost of running a slow cooker for delicious meals with minimal effort.
Estimate how much you can save on electricity by using smart thermostats, LED lights and automation. Enter your current bills and expected efficiency to discover yearly savings.
Estimate allowable soil bearing capacity using Terzaghi's formula for shallow foundations.
Compute soil bulk density from mass and volume and estimate total porosity using particle density.
Estimate how quickly water soaks into soil using test depth and time. Useful for irrigation planning and stormwater management.
Determine how much lime or sulfur your soil needs to reach a target pH. Enter current pH, desired pH, area, and soil texture for a quick estimate.
Determine USDA soil texture class from sand, silt, and clay percentages using the soil texture triangle.
Estimate annual backup power costs for a solar battery system compared to a fuel generator.
Estimate passive airflow driven by a solar chimney from height, temperature difference and cross sectional area.
Enter your latitude and longitude to see if upcoming solar eclipses will be total or partial from your location using a simple distance model.
Estimate the chance of an M-class solar flare using sunspot number and solar flux.
Estimate collector area needed for a solar food dehydrator based on food mass, moisture removal and solar insolation.
Estimate how often to clean your solar panels based on dust levels, rainfall, and tilt angle. Keep your photovoltaic system running efficiently.
Determine how often to wash solar panels by comparing soiling losses, energy prices, and cleaning costs to identify the break-even interval.
Estimate how a photovoltaic system's capacity declines over the years. Enter initial wattage, annual degradation rate, and years to project remaining output.
Calculate the sun's current azimuth and elevation for any location and time. Useful for solar panel setup, photography, and astronomy.
Compare solar roof installation cost with a conventional roof and estimate payback period from electricity savings.
Predict the volume of distilled water a solar still can produce from sunlight, basin size, and efficiency.
Estimate the likelihood of high-frequency radio communication blackouts due to solar storms using sunspot number, solar flux, CME speed, and operating frequency.
Estimate astronaut suit temperature from metabolic heat, solar flux, emissivity and cooling capacity.
Predict species richness for a habitat using the classic species-area power law to explore biodiversity loss or gain from area changes.
Transcribe spoken words into written text using your browser's SpeechRecognition API. Start, stop, and explore recognition accuracy.
Determine required area and plan dimensions for isolated spread footings based on column load, soil bearing capacity, and chosen aspect ratio.
Calculate radiant heat emission using the Stefan-Boltzmann law. Determine power based on temperature, surface area, and emissivity.
Compute Stirling numbers of the second kind to count set partitions.
Compute total and unit stream power from discharge, slope, and width to assess river erosion intensity.
Calculate yearly carbon emissions for various commute methods and discover potential savings.
Predict the final temperature of a river after mixing with heated effluent and evaluate compliance with thermal discharge limits.
Estimate daily hot water production from a thermosiphon solar water heater using collector area, insolation and efficiency.
Convert time between seconds, minutes, hours, days, weeks, months and years with this time converter.
Estimate watershed time of concentration using the Kirpich equation and learn how flow length and slope influence runoff timing.
Estimate how many herbs or vegetables you can grow on a small balcony. Input container count, sunlight hours, and plant spacing to predict yield.
Estimate microplastic particles released from vehicle tire wear using distance, vehicle mass, tread compound and driving style.
Convert dissolved calcium and magnesium concentrations into total hardness as CaCO3 and interpret water softness categories.
Compute effective field capacity, operation time, and fuel use for farm machinery using implement width, speed, and efficiency.
Compute annual soil loss using the Universal Soil Loss Equation (USLE) with rainfall, soil, slope, cover, and practice factors.
Convert Unix timestamps to readable dates and convert dates back to epoch seconds with this easy Unix Timestamp Converter for developers.
Estimate steady-state pollutant concentration in a city using a simple box model with emissions, wind speed, and mixing height.
Estimate nighttime urban heat island intensity from surface cover, anthropogenic heat and wind.
Estimate incremental sky brightness from city lighting and assess visibility risk for stargazing
Model how much a planting project could cool a paved area by estimating canopy coverage and using published heat island mitigation research.
Estimate how street tree plantings reduce stormwater runoff volume and overflow risk through canopy interception and soil infiltration.
Estimate saturation vapor pressure, actual vapor pressure, and vapor pressure deficit from air temperature and relative humidity.
Calculate how much produce you can grow in a vertical garden. Input tiers, plants per tier, yield per plant, and harvests per year.
Calculate biochemical oxygen demand loading and population equivalent for wastewater flows.
Estimate your household water footprint from daily activities like showers, laundry, and lawn watering. Learn how to conserve and reduce usage.
Estimate household water softener capacity and salt consumption from hardness, occupancy, and usage.
Compute the annual water balance for a watershed using precipitation, evapotranspiration, and runoff.
Compute the power available in ocean waves from height and period to aid renewable energy planning.
Estimate the energy use and CO2 emissions generated by serving a webpage based on page size, traffic, and energy mix.
Estimate wet bulb temperature from air temperature and relative humidity. Learn how moisture affects perceived heat.
Estimate effluent concentration and mass removal of nutrients in a treatment wetland using first-order kinetics.
Determine the wavelength of maximum emission for a blackbody at any temperature using Wien's displacement law.
Use the Wind Erosion Equation to approximate annual soil loss from wind based on erodibility, climate, surface roughness, field length, and vegetative cover.
Calculate the potential power output of a small wind turbine with our Wind Turbine Energy Calculator. Enter blade size, wind speed, and efficiency to see daily energy production.
Estimate when to replace window caulking using climate zone, orientation, and caulk type.
Estimate annual cooling energy savings from installing window tint using solar heat gain coefficients.
Estimate how often to replace windshield wiper blades based on climate and usage.
Find out how large your worm composting bin should be based on household food scraps and worm count. Get tips on bedding materials and maintenance.
Estimate your warmth in icy terrain using fur length, snow depth, and activity level. A humorous tool for cryptid enthusiasts and winter hikers.
Estimate how much money you can save by diverting household waste from landfills through recycling and composting.