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 347 calculators available.
Compute air density from temperature, pressure, and humidity. Learn how weather conditions affect air mass and why it matters in aviation, HVAC, and science.
Find out how much your appliances cost to run by entering wattage, hours of use, and electricity rate.
Apply Bayes' theorem to combine prior probability with new evidence and compute the posterior.
Use this simple BMR calculator to estimate how many calories your body burns at rest each day. Learn about the Mifflin-St Jeor equation and how understanding your basal metabolic rate can guide healthy eating and fitness goals.
Calculate how many calories you burn during exercise based on activity intensity, your weight, and duration.
Calculate your annual carbon footprint based on home energy, transportation, diet, and waste habits. Discover ways to reduce your environmental impact today.
Calculate the area of a circle easily. Enter a radius or diameter and get the precise area in square units.
Find the confidence interval around a sample mean using the standard deviation and sample size.
Compute the Pearson correlation between two sets of numbers to see how strongly they move together.
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 the derivative of a polynomial at any point to see how fast the function changes there.
Find the dew point temperature using air temperature and humidity to gauge comfort and condensation risk.
Estimate the perceived frequency of a wave when the source or observer is moving.
Convert earthquake magnitude to energy release and TNT equivalent. Learn how seismic energy scales with magnitude and why these numbers matter for hazard assessment.
Compute the speed needed to escape a planetary body's gravitational pull.
Calculate the heat potential of your firewood stack. Choose wood species, amount in cords, and moisture content to see total BTUs.
Estimate how much carbon a forest stores and sequesters annually based on area, tree density, and age. Understand your woodland's climate impact.
Quickly compute gravitational force between two masses with our Gravitational Force Calculator. Perfect for physics students and science enthusiasts.
Calculate the great circle distance between two coordinates using the haversine formula.
Estimate the structural load of a vegetated roof by entering area, soil depth, and material density.
See how much it costs to heat your greenhouse by entering area, temperature difference, and energy price. Learn tips to minimize fuel expenses.
Calculate the remaining amount of a radioactive substance after a given time using its half-life.
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.
Calculate heat loss through walls, windows, and other surfaces using area, U-value, and temperature difference. Learn how insulation levels affect energy efficiency.
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.
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.
Enter paired X and Y data to compute the slope, intercept, and R-squared of a simple linear regression.
Calculate the determinant of a 2x2 or 3x3 matrix to understand linear transformations.
Calculate molar concentration of a solution with our Molarity Calculator. Perfect for chemistry students and lab professionals.
Estimate how long paint will take to dry with our handy Paint Drying Time Calculator. Adjust for temperature, humidity, paint type, and coat thickness.
Find the percentile rank of a value within a set of numbers to gauge its relative standing.
Calculate how many liters or gallons per minute flow through a round pipe. Enter diameter and velocity to see results instantly.
Find the prime factors of any positive integer quickly and easily.
Calculate projectile range, time of flight, and peak height with our Projectile Motion Calculator. Perfect for physics problems and engineering tasks.
Solve quadratic equations instantly with our Quadratic Equation Solver. Simply input your coefficients to find real or complex roots easily.
Determine absorbed dose from radiation intensity and time of exposure. Learn about sieverts, health guidelines, and typical sources.
Determine the number of responses needed for reliable survey or experiment results.
Estimate how much water you use in the shower and learn tips to conserve. Enter flow rate, shower time, and water cost.
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.
Calculate the optimal tilt angle for your solar panels based on latitude and date to maximize energy capture.
Calculate the sun's current azimuth and elevation for any location and time. Useful for solar panel setup, photography, and astronomy.
Compute the mean and standard deviation of a set of numbers to understand variation.
Estimate sunrise and sunset times for any location on a specific date.
Calculate your Total Daily Energy Expenditure (TDEE) with this straightforward calculator. Determine how many calories you need each day based on your activity level.
Evaluate indoor comfort by calculating predicted mean vote (PMV) and percentage of dissatisfied (PPD) using temperature, humidity, clothing, and activity levels.
Compute linear expansion for metals, plastics, and building materials. Enter length, temperature change, and coefficient to see how much a component expands.
Determine the number of photos needed for a time-lapse project and see the final video duration.
Calculate the cross product of two vectors and learn how this fundamental operation is used in physics and engineering for torque, rotation, and area calculations.
Calculate voltage drop across electrical conductors to size wiring correctly and avoid energy loss.
Use our Wind Chill Calculator to discover how cold it really feels outside. Enter air temperature and wind speed to get the perceived temperature and learn safety tips for extreme cold.
Determine approximate wind forces on a flat surface. Enter area, wind speed, and a drag coefficient to calculate wind pressure and total force.
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.