Useful tools

Calculators

Choose a calculator by the decision you are trying to make. Every live tool works without an account.

Everyday Math

Percentages, changes and discounts for quick everyday comparisons.

Find a percentage of any number using exact decimal arithmetic.

Measure how much a value increased or decreased between two points.

Calculate the final price, amount saved and effective discount.

Understand payments, borrowing and how balances grow over time.

Estimate a fixed monthly payment and the total interest paid.

See how a starting balance grows when interest is added repeatedly.

Measure calendar intervals and plan around dates, weekdays and workweeks.

Count the calendar distance between two dates in useful formats.

Count Monday-to-Friday working days between two dates and see the weekend-day breakdown.