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Calculators

Fast, accurate calculators for everyday math.

9 free tools · updated regularly

Find a missing width or height that keeps the original aspect ratio, and see the simplified ratio.

Find the hours and minutes between a start and end time, minus breaks — handles overnight shifts.

Estimate the fuel cost of a trip from the distance, your vehicle's fuel economy and the price of fuel.

Solve proportions (A:B = C:D) for a missing value and simplify ratios to their lowest terms.

Enter your course grades and credit hours to calculate your weighted GPA on a 4.0 scale.

Find the sale price and how much you save from an original price and a percentage off.

Work out the tip, total, and amount per person for any bill — with quick percentage presets.

Find your exact age in years, months and days, plus total days and your next birthday.

Find a percent of a number, what percent one value is of another, and percentage change — instantly.

About Calculators

From finance to fitness to unit conversions — a complete set of free calculators that just work.