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Turn watts and hours into a cost per day, month and year.

Add, subtract, multiply and divide two fractions with a simplified result.

What a journey costs in fuel, and what each passenger owes.

Find the greatest common divisor and least common multiple of several integers.

Calculate cost, price, profit, margin and markup from any two known values.

Litres to kilograms and grams to millilitres, using density.

Percent of a number, percentage change, add or subtract a percent.

Solve any missing value in the proportion a/b = c/d.

Round a number to decimal places or powers of ten using four methods.

Turn a Polish employment contract salary into take-home pay, with the yearly threshold and contribution cap handled correctly.

Calculate net, VAT and gross amounts using a country preset or your own rate.

Calculate a weighted average from value and weight pairs.