Calculators

Project your retirement savings from current savings and monthly contributions. Free, in your browser, no sign-up.

Calculate return on investment from the amount invested and returned. Free, in your browser, no sign-up.

Add sales tax to an amount and see the tax and total. Free, in your browser, no sign-up.

A full scientific calculator with trig, logs, powers, roots, and factorials, evaluated safely. Free, in your browser, nothing is uploaded.

Find the best bedtimes or wake times based on 90-minute sleep cycles. Free, in your browser, nothing is uploaded.

Estimate a monthly student loan payment and the total interest over the term. Free, in your browser, no sign-up.

Estimate your Total Daily Energy Expenditure, the calories you burn per day including activity. Free, in your browser, no sign-up.

Calculate a tip, the total with tip, and the amount per person when splitting a bill. Free, in your browser, no sign-up.

Estimate how much water to drink per day based on your body weight. Free, in your browser, no sign-up.