Calculators
Free everyday calculators for dates, age, grades, and dimensions.
Age Calculator
Get your exact age in years, months, days, hours and minutes, plus...
Open tool→Aspect Ratio Resize Calculator
Enter one new dimension and instantly get the matching width or height...
Open tool→Battery Life / Runtime Calculator
Enter battery capacity and device draw to get runtime in seconds through...
Open tool→BMI Calculator
Find your BMI, your healthy weight range, and exactly how many pounds...
Open tool→Chess Elo Rating Calculator
See your exact Elo rating change, win probability, and tournament performance rating.
Open tool→Concrete Calculator
Figure out how much concrete — and how many bags — your...
Open tool→Cycling FTP & Power Zone Calculator
Turn one test effort into your FTP and full training power zones.
Open tool→Daily Water Intake Calculator
Get a personalized daily water target in liters, ounces, cups, and bottles...
Open tool→Date Difference Calculator
Find the exact difference between two dates in years, months, days, weeks,...
Open tool→Dog Food Calculator
Enter your dog's weight and food label info to get an accurate...
Open tool→Drywall Calculator
Find out exactly how many drywall sheets, screws, and joint compound a...
Open tool→Epoxy Resin Calculator
Find out exactly how much resin and hardener to mix for your...
Open tool→Fence Calculator
Enter fence length, height, and style to get posts, panels, rails, concrete...
Open tool→Final Grade Calculator
Enter your current grade, target grade and exam weight to see the...
Open tool→GCD & LCM Calculator
Find the GCD and LCM of any set of numbers, with prime...
Open tool→Geometry Calculator
Pick a shape, enter your measurements, and get area, perimeter, volume, or...
Open tool→GPA Calculator
Enter your grades and credit hours to get your GPA instantly —...
Open tool→Heart Rate Zone Calculator
Find your 5 heart rate training zones — with the more personalized...
Open tool→Hijri Age Calculator
Find your exact age in the Islamic (Hijri) calendar, plus your Hijri...
Open tool→LED Resistor Calculator
Get the exact resistor value, wattage, and color bands for any single,...
Open tool→Macro Calculator
Get real protein, carb, and fat gram targets for your goal and...
Open tool→Matrix Calculator
Add, subtract, multiply, transpose, or find the determinant and inverse of two...
Open tool→Multiplication Table Generator
Build a custom times table for any range, print it as a...
Open tool→One-Rep Max (1RM) Calculator
Find your true one-rep max from a submax set, averaged across six...
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