We are working on building a calculator for every computation life throws at you - from the serious to the whimsical. Now also in Spanish and Portuguese!
We currently have 500 calculators available.
Use our 3D Printing Cost Calculator to estimate material, electricity, and machine costs for your prints. Plan budgets accurately and learn tips for saving money.
Estimate the temperature of a thin accretion disk around a star or black hole from mass, accretion rate, and radius.
Compute the concentration of an acid or base solution at the equivalence point using titration volumes and molarity.
Estimate the Alfvén wave speed in a plasma from magnetic field strength and mass density using the classic magnetohydrodynamic formula.
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 the ideal filter flow rate for your fish tank based on volume and stocking levels. Keep your aquarium clean and healthy.
Determine ideal aquarium lighting hours based on tank type and natural daylight. Learn how proper schedules promote healthy fish and plants.
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.
Calculate reaction rate constants using the Arrhenius equation. Determine how activation energy and temperature affect chemical kinetics.
Estimate the density scale height of an atmosphere using temperature, molar mass, and surface gravity.
Use Avogadro's constant to convert between moles, molecules, and mass for any substance.
Calculate midspan deflection for a simply supported beam with a central point load. Learn about Young's modulus, moment of inertia, and how loading affects structural stiffness.
Estimate international bitterness units for your homebrew using hop weight, alpha acids, boil time, and final volume. Dial in the perfect level of bitterness.
Calculate the concentration of a solution from absorbance measurements using the Beer-Lambert law.
Determine the correct spoke length for your custom bike wheel by entering rim diameter, hub dimensions, and lacing pattern.
Convert numbers between binary, decimal, and hexadecimal instantly. Ideal for programmers, students, and electronics hobbyists who need a quick base converter.
Estimate how far migratory birds travel by entering starting and ending coordinates. Learn about migration patterns and conservation efforts.
Calculate body surface area using the simple Mosteller formula. Enter your height in centimeters and weight in kilograms to see your BSA.
Determine diffraction angles using Bragg's law for crystallography and materials analysis.
Determine the upward force exerted by a fluid on a submerged object. Explore fluid density, displaced volume, and gravity.
Determine the number of business days between two dates, excluding weekends and holidays.
Determine your recommended daily caffeine allowance with our Caffeine Intake Calculator. Enter your weight and consumed caffeine to see if you are within safe limits.
Determine how high a liquid climbs in a capillary tube using surface tension, contact angle, and tube radius. Learn the physics of capillary action and its real-world implications.
Estimate your annual and long-term vehicle expenses with our Car Cost of Ownership Calculator. Analyze fuel, maintenance, insurance, and financing to see the real price of owning a car.
Calculate the maximum theoretical efficiency of a heat engine using the Carnot equation. Explore how temperature limits convert heat into useful work.
Determine the relative centrifugal force (RCF) generated by a laboratory centrifuge from its rotation speed and rotor radius. Helpful for biologists and lab technicians.
Compute the angle of Cherenkov radiation emitted by a charged particle moving through a medium. Enter particle speed and refractive index to see the emission geometry.
Predict how many eggs your hens will lay. Enter flock size, expected eggs per hen per week, and time frame to plan for sales or household use.
Determine the retention factor of analytes in chromatography using retention and dead times.
Estimate vapor pressure at a new temperature using the Clausius-Clapeyron equation. Account for enthalpy of vaporization and reference conditions.
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.
Compute the Coriolis force acting on moving objects due to Earth’s rotation. Explore how mass, speed, and latitude influence deflection in rotating frames.
Calculate the electric force between two charged particles using Coulomb's law. Explore how charge magnitude and separation distance affect electrostatic interactions.
Find the critical angle for total internal reflection when light travels from a denser to a rarer medium.
Calculate the cyclotron frequency of a charged particle in a magnetic field. Useful for plasma physics and mass spectrometry.
Explore the time-dependent displacement of a damped harmonic oscillator using mass, damping coefficient, and spring constant. Learn about underdamping, critical damping, and overdamping.
Estimate the likelihood of a data breach by entering workforce size, training frequency, security spending, and past incidents. Explore tips to reduce risk.
Estimate your monthly cell phone data bill by entering plan details, included data, and typical usage. Learn ways to reduce costs.
Easily calculate the number of days between two dates with our simple Date Difference Calculator. Ideal for countdowns and tracking important events.
Compute the de Broglie wavelength of any particle by entering its mass and velocity. Explore wave-particle duality and the quantum realm.
Estimate the Debye length for a plasma or electrolyte from temperature, charge density, and relative permittivity. Understand how electric fields are screened in ionized gases.
Explore the Debye model for solids and compute the specific heat from the Debye temperature and actual temperature.
Find the perfect dehumidifier capacity for any room. Enter your space dimensions and humidity level to see the recommended pint rating and learn how to control moisture.
Compute near and far focus distances plus total depth of field using aperture, focal length, subject distance, and sensor size.
Determine diffraction angles for any light wavelength and grating spacing using the interference equation d sin(θ) = m λ. Explore optics with this detailed tool.
Calculate dimensional weight for parcels using length, width, height, and carrier divisors. Avoid shipping surprises by understanding how couriers charge for large yet lightweight packages.
Compute the aerodynamic or hydrodynamic drag force on an object using density, velocity, drag coefficient, and cross-sectional area.
Build financial security with our emergency fund calculator. Estimate how much you should save and how long it will take based on your monthly expenses and savings rate.
Calculate the optimal desk height for seated or standing work based on your body measurements. Discover ergonomic tips for monitor placement, chair adjustment, and healthy posture.
Calculate the expected brightness drop of a star during a planetary transit to estimate exoplanet size.
Determine the electromotive force generated in a coil when magnetic flux varies using Faraday's law of electromagnetic induction.
Compute the probability that an energy level is occupied in a solid using Fermi-Dirac statistics.
Compute the diffusive flux of particles across a concentration gradient using Fick's first law.
Calculate how many years it may take to achieve financial independence and retire early using projected savings, investment returns, and annual expenses.
Calculate the rate at which a Foucault pendulum's swing plane rotates based on latitude and explore the rich history and physics behind this classic experiment.
Simplify fractions or calculate addition, subtraction, multiplication, and division with this browser-based fraction calculator. Perfect for students, teachers, and anyone working with ratios.
Determine how a solute lowers the freezing point of a solvent using ΔTf = i Kf m.
Calculate reflection coefficients for s- and p-polarized light when it strikes an interface between two media with different refractive indices.
Estimate the radius of the first Fresnel zone for radio links to evaluate obstruction effects.
Calculate electric flux through a surface and the enclosed charge using Gauss's law.
Determine gear ratios and output speed from tooth counts. Learn how gear trains influence torque, motion, and mechanical advantage in a variety of applications.
Use our Graphing Scientific Calculator to evaluate complex expressions, plot functions, integrate equations and share interactive graphs.
Calculate the ventilation needs of your greenhouse based on its dimensions and air changes per hour. Optimize plant health with adequate airflow.
Estimate guitar string tension by entering scale length, string gauge, and tuning pitch. Understand how tension influences playability, tone, and instrument setup.
See if a monthly gym membership saves money compared to drop-in fees by entering your visit frequency and pricing.
Generate MD5 or SHA-256 hashes instantly with this browser-based hash generator. Useful for verifying downloads and creating unique fingerprints.
Calculate the heat index easily with our Heat Index Calculator. Combine temperature and humidity to see the true feel outside and learn safety tips for extreme heat.
Determine your eligibility for Hong Kong's Quality Migrant Admission Scheme with our QMAS Points Calculator. Calculate points for age, education, experience, language skills, and more.
Calculate spring force and potential energy from a given spring constant and displacement using Hooke's law.
Estimate how long it will take to heat your hot tub based on water volume, heater power, and starting temperature. Learn energy-saving tips for spa owners.
Determine how much light your indoor plants need. Enter plant type and window direction to see recommended placement and care tips.
Convert HTML snippets to Markdown quickly and privately in your browser. Paste your HTML and get clean Markdown for documentation or note taking.
Calculate the distance to distant galaxies using Hubble's Law v = H0 d or redshift. Understand how cosmic expansion relates recessional velocity to distance.
Estimate the proper duct diameter for heating and cooling systems using airflow (CFM) and duct length. Improve efficiency and reduce noise.
Estimate the force output of a hydraulic cylinder from bore diameter, rod diameter, and fluid pressure. Learn how hydraulics transmit power in machinery.
Calculate hydrostatic pressure in water or any liquid by entering density, depth, and gravity. Learn why pressure increases with depth and how it applies to engineering, diving, and everyday science.
Estimate the Larmor precession frequency of a charged particle in a magnetic field using charge, mass, and field strength.
Compute free spectral range and longitudinal mode frequencies for a laser cavity using its length and refractive index.
Find out how much it really costs to do laundry at home or the laundromat. Enter washer and dryer power, water usage, detergent cost, and electricity price to see per-load expenses.
Calculate the minimum wattage and amperage for your LED strip lighting project by entering strip length and power usage per meter.
Compute the interaction energy between two neutral atoms using the Lennard-Jones potential and learn about van der Waals forces.
Find the log mean temperature difference (LMTD) for parallel or counterflow heat exchangers based on inlet and outlet temperatures.
Model population growth with carrying capacity using the logistic equation. Explore how growth rate, initial population, and time influence size.
Determine the magnetic Reynolds number for moving conductive fluids and evaluate magnetic field diffusion.
Estimate how far a gas molecule travels between collisions using temperature, pressure, and molecular diameter.
Compute enzyme reaction rates using the Michaelis-Menten equation. Explore how substrate concentration, Vmax, and Km affect catalytic speed.
Calculate the spacing between lattice planes in cubic crystals using Miller indices and lattice constants.
Determine the molar mass of a compound by entering its chemical formula. Useful for stoichiometry and laboratory preparations.
Compute the moment of inertia for basic shapes such as rods, disks, and spheres. Learn how mass distribution affects rotational motion.
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.
Estimate your points for New Zealand's Skilled Migrant Category Resident Visa using our updated 2024 points calculator. Check your qualification, income, or registration points and add work experience to see if you meet the minimum threshold.
Predict how an object's temperature approaches the ambient environment over time using Newton's Law of Cooling. Enter initial and surrounding temperatures, a cooling constant, and elapsed time.
Determine your estimated one-repetition maximum (1RM) using weight and repetitions to plan safe strength training workouts.
Compute theoretical prices for European call and put options using the Black-Scholes formula. Learn how volatility, interest rates, and time to expiration affect option premiums.
Calculate the orbital period of a satellite or planet using its orbital radius and the mass of the central body.
Calculate permutations and combinations for any set size directly in your browser. Great for statistics students and anyone exploring probability.
Compute fundamental Planck units such as length, time, mass, and temperature using gravitational, quantum, and relativistic constants.
Compute a planet's equilibrium temperature from its stellar flux and albedo to understand climate conditions.
Determine the electron plasma frequency from density to explore wave propagation in plasmas.
Find out how much reactive power you need to add with capacitors to reach your target power factor. Enter real power, apparent power, line voltage, and desired power factor.
Estimate the probability of a particle tunneling through a rectangular potential barrier using mass, energy, barrier height, and width.
Convert insulation R-value to U-value or vice versa to understand heat flow through walls, roofs, and windows.
Convert Raman shift values to scattered wavelengths for spectroscopy experiments.
Compute the Rayleigh number to judge whether natural convection will occur based on temperature difference, fluid properties, and length scale.
Calculate the time constant of a resistor-capacitor circuit and learn how it affects voltage rise and fall. Great for electronics hobbyists and engineers.
Analyze your writing with our Readability Score Calculator. Paste any text to instantly see Flesch-Kincaid scores and learn how to improve clarity for your audience.
Estimate the heat generated by a resistor or electrical load using current or voltage, resistance, and time.
Compute the Reynolds number for a fluid flow using density, velocity, characteristic length, and viscosity. Determine whether the flow is laminar or turbulent.
Estimate the minimum orbital distance at which a satellite can orbit a massive body without being torn apart by tidal forces.
Convert numbers to Roman numerals and back with this easy Roman numeral converter. Learn how the Roman numeral system works and its history.
Compute the ratio of ionized to neutral atoms in a gas using the Saha equation with temperature and electron density.
Estimate how often you should pump your septic tank based on tank size, household occupants, and usage habits.
Compute Shannon entropy from probability values to quantify uncertainty in data.
Calculate the oscillation period of a simple pendulum using length and gravitational acceleration. Learn how T = 2π√(L/g) governs swing timing.
Estimate electromagnetic skin depth in conductors from frequency, resistivity, and permeability.
Determine the refracted angle when light passes between materials with different indices of refraction using Snell's Law.
Determine how much lye and water to use for your homemade soap. Adjust for superfat percentage and oil weight to create reliable recipes.
Compute the magnetic field inside a solenoid from the number of turns, current, length, and core permeability. Learn how coils generate magnetic fields with the solenoid equation.
Calculate radiant heat emission using the Stefan-Boltzmann law. Determine power based on temperature, surface area, and emissivity.
Estimate the distance to nearby stars from their observed parallax angles. Learn the geometry behind parallax and how astronomers use it to map the cosmos.
Estimate the diffusion coefficient of small particles in a fluid using the Stokes-Einstein equation.
Calculate the distance a vehicle needs to come to a complete stop. Enter speed, reaction time, and road friction to see how far you'll travel before halting.
Determine the gravitational acceleration on any planet or moon using its mass and radius. Explore how surface gravity shapes planetary environments.
Calculate the diffraction-limited angular resolution of a telescope using wavelength and aperture diameter. Learn how aperture size influences your ability to separate close celestial objects.
Find perfect delay times for your music by converting tempo in BPM to milliseconds for common note values.
Change text between uppercase, lowercase, title case, camelCase, and more with this offline Text Case Converter. Useful for developers and writers alike.
Evaluate indoor comfort by calculating predicted mean vote (PMV) and percentage of dissatisfied (PPD) using temperature, humidity, clothing, and activity levels.
Calculate the recommended tire pressure based on temperature differences. Keep your tires properly inflated for safety and fuel efficiency.
Convert engine torque and RPM to horsepower or kilowatts. Learn how torque relates to power output and why both values matter for vehicles and machinery.
Calculate the oscillation period of a torsional pendulum using its moment of inertia and torsion constant.
Easily encode or decode URLs in your browser with this client-side tool. Perfect for developers and marketers who need quick conversions without network requests.
Generate UUIDs instantly with this online UUID/GUID generator. Ideal for developers needing client-side unique identifiers.
Estimate the pressure of a real gas using the Van der Waals equation with adjustable constants a and b. Compare non-ideal behavior to the ideal gas law.
Calculate the ideal distance to sit from your TV or projector based on screen size and field of view.
Calculate the bandwidth needed for your VoIP phone system based on codec bitrate and concurrent calls. Prevent choppy audio by planning the right connection.
Convert water hardness between parts per million, grains per gallon, and German degrees. Learn about hardness levels and how to soften water.
Determine the ideal water heater size for your household using the number of occupants and bathrooms. Learn how capacity and first-hour rating affect performance.
Compute the cutoff frequency of rectangular waveguides from dimensions and mode indices using classic microwave formulas.
Determine the wavelength of maximum emission for a blackbody at any temperature using Wien's displacement law.
Quickly count words, characters, and lines in your text with this lightweight word counter. Perfect for writers, students, and developers needing an offline tool.
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 the wavelength shift of atomic spectral lines in a magnetic field using the Zeeman effect. Explore atomic physics and spectroscopy.