🧮 Calculators

Find what percent a value is of another, or how much a percentage change is.

Work out the price after a discount, and how much you save.

Calculate profit margin and markup from revenue and cost.

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

Estimate the monthly payment, total paid, and total interest on a fixed-rate loan.

Find someone’s exact age in years, months and days from their birth date.

Calculate return on investment, with an optional annualized rate.

Calculate your credit-weighted GPA from a list of courses.

Estimate how much paint and how many cans you need for a wall.

Estimate the fuel needed and cost for a trip.

Scale a recipe’s ingredient quantities up or down for a different serving size.

Estimate the BTU (heating/cooling capacity) needed for a room.

Calculate concrete volume and bags needed for a slab.

Calculate flooring area and boxes needed for a room, including waste.