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.
Convert acoustic intensity to decibel level using the standard reference value.
Calculate spectral radiance using Planck's law for a blackbody at a given temperature and wavelength.
Estimate your blood alcohol concentration with our BAC Calculator. Enter drinks consumed, body weight, and time to understand alcohol effects and stay safe.
Calculate your Body Mass Index (BMI) easily with our BMI calculator. Enter your weight and height to find out if you're underweight, normal weight, overweight, or obese.
Calculate your Basal Metabolic Rate (BMR) quickly. Find out how many calories your body burns at rest to plan your diet and fitness goals.
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 much fuel your boat will use based on engine horsepower, cruise speed, and distance. Plan efficient trips and avoid running out of gas.
Estimate your body fat percentage using the U.S. Navy Method. Enter your height, neck, waist, and hip measurements to get an accurate body fat estimate.
Calculate how many calories you burn during exercise based on activity intensity, your weight, and duration.
Calculate a daily calorie target for losing weight safely. Enter your maintenance calories and desired deficit to see how many calories you should consume.
Calculate your daily caloric needs using the Calorie Intake Calculator. Determine your BMR and TDEE to maintain, lose, or gain weight effectively.
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.
Estimate how much water you should drink each day. Enter your body weight to see a recommended daily water intake.
Calculate how much fertilizer you need based on area size, desired nutrient rate, and fertilizer grade.
Estimate the proper duct diameter for heating and cooling systems using airflow (CFM) and duct length. Improve efficiency and reduce noise.
Calculate the exact amount of nutrient concentrate needed for your hydroponic system based on reservoir size and desired strength.
Determine an object's Mach number from its speed and ambient temperature. Explore supersonic flight and compressible flows.
Break down your daily calories into carbs, protein, and fat. Enter your calorie target and macro percentages to get grams for each nutrient.
Determine how long you can safely stay in loud environments based on sound level.
Use our Ovulation Fertility Calculator to estimate your most fertile days and increase your chances of conception. Simple and easy to use.
Use our Personal Injury Compensation Calculator to estimate your settlement amount. Enter your medical expenses, lost wages, and pain & suffering to see your potential compensation.
Use our Personal Injury Settlement Calculator to estimate how much your accident or injury claim could be worth based on medical expenses, lost wages, and more.
Planning a pizza party? Instantly calculate how many pizzas you'll need based on your guests and their appetite level. Avoid running out or having leftovers!
Estimate your pregnancy due date with our reliable calculator. Use your last menstrual period (LMP) or conception date to plan your journey to parenthood.
Estimate how much protein you should eat each day based on your body weight. Ideal for fitness planning and healthy dieting.
Determine absorbed dose from radiation intensity and time of exposure. Learn about sieverts, health guidelines, and typical sources.
Calculate the pressure exerted by electromagnetic radiation on a surface, including options for absorption or reflection.
Calculate the material thickness required to reduce radiation intensity using the exponential attenuation formula.
Calculate how long it will take to read a text by entering word count or pasting content. Adjust reading speed to match your pace.
Estimate RT60 using room dimensions and absorption coefficient. Learn how reverberation affects sound clarity in studios, auditoriums, and home theaters.
Calculate your running pace quickly. Enter distance and total time to see your pace per mile or kilometer.
Estimate how long your running shoes will last. Enter shoe lifespan in miles, weekly mileage, and cost to plan replacements and budget.
Compute signal-to-noise ratio in linear units or decibels. Understand how noise affects communications, audio fidelity, and scientific measurements.
Discover optimal bedtimes based on your desired wake-up time. This Sleep Cycle Calculator helps you align with 90-minute sleep cycles for better rest.
Measure how much sleep you miss each week and plan recovery with this simple Sleep Debt Calculator.
Estimate your nightly restfulness by entering sleep duration, awakenings, time to fall asleep, and snoring level. Discover tips to improve sleep hygiene.
Calculate the real cost of smoking cigarettes over time. See how much money you could save by quitting smoking today.
Estimate how often to clean your solar panels based on dust levels, rainfall, and tilt angle. Keep your photovoltaic system running efficiently.
Calculate the speed of sound in an ideal gas from temperature, molar mass, and heat capacity ratio.
Estimate the internal volume of your subwoofer box by entering its external dimensions and wall thickness. Learn how volume affects sound quality for sealed and ported enclosures.
Find out how long you can stay in the sun before burning by entering the UV index, your skin type, and sunscreen SPF. Learn tips to protect your skin and enjoy the outdoors.
Calculate your target heart rate zones for optimal fitness and exercise intensity. Use our Target Heart Rate Calculator for personalized recommendations.
Calculate your Total Daily Energy Expenditure (TDEE) with this straightforward calculator. Determine how many calories you need each day based on your activity level.
Estimate the RMS thermal noise voltage generated by a resistor at a given temperature and bandwidth.
Estimate how long you should rest after a workout based on intensity, duration, sleep, and nutrition.