All calculators

14 free calculators, grouped by what they help you work out. Every one runs in your browser — no sign-up, nothing uploaded.

Everyday Money

Quick answers for bills, tips and splitting costs.

Tip Calculator
Work out the tip, the total and everyone's share.
Loan Payment Calculator
Monthly payment, total interest and the cost of paying extra.
Compound Interest Calculator
See what savings grow to, with regular contributions.

Work out what you actually pay at the till.

Grades, credits and academic averages.

Scientific calculations, fractions, percentages, triangles and statistics.

Percentage Calculator
Every common percentage question, with the working shown.
Scientific Calculator
Trig, logs, powers, roots and memory, with keyboard support.
Fraction Calculator
Add, subtract, multiply, divide and simplify fractions.
Random Number Generator
Pick random whole numbers or decimals in any range.
Triangle Calculator
Solve any triangle from three sides or angles.
Standard Deviation Calculator
Mean, variance and standard deviation of a list of numbers.

Count days, plan deadlines and compare dates.

Everyday health numbers, explained in plain language.