Math & Everyday Calculators

Flip a virtual coin and get heads or tails instantly — with a history of your last flips.

Work out what X% of a number is — and switch to the other common percentage questions too.

Find out what percentage one number is of another.

Find the average (mean), sum, count and median of up to five numbers — leave the optional fields blank for fewer values.

Calculate profit margin and markup percentage from a selling price and cost — for pricing any product or service.

Check whether a number is prime and see its full prime factorization.

Roll up to 10 virtual dice — d4, d6, d8, d10, d12, d20 or d100 — perfect for board games and D&D.

Quickly work out the sale price and how much you save when an item is a given percent off.

Calculate the sale price and amount saved after a percentage discount.

Work out the tip and total bill, and split it evenly between any number of people.

Simplify a ratio to its lowest terms and express it as a decimal and a percentage.

Back out the pre-tax price and the sales tax amount from a tax-inclusive total — handy for receipts and expense reports.

Calculate the area of a room or space in square feet from its length and width, with conversions to square yards, square meters and acres.

Find the square root, square and cube root of any number instantly.

Calculate the percentage increase or decrease between two numbers.

Find the least common multiple (LCM) and greatest common factor (GCF/HCF) of two numbers.

Can't decide? Ask the wheel — get an instant YES or NO (with an optional Maybe) and settle it.

Paste a list of names or options and pick one at random — fair draws for giveaways, teams and classrooms.

Calculate a mod b — the remainder after division — with the floor quotient shown too.