A FREE ONLINE CALCULATOR

All Calculators

Every free calculator on this site, grouped by category.

Finance & Tax

Money, tax, and investing

Compound Interest Calculator See how your savings grow with compound interest — enter the principal, annual rate, years, and compounding frequency. Take-Home Pay Calculator Work out your net take-home pay from your gross salary, tax rate, and other deductions — annual and monthly.

Business & Startup

Start and run a business

Business Startup Cost Calculator Add up the one-time and monthly costs of starting a business — and see your first-year total and monthly burn before you spend anything. Break-Even Calculator Find how many units you must sell to cover your costs — from fixed costs, variable cost per unit, and your selling price. Profit Margin Calculator Calculate your profit, profit margin, and markup from revenue and cost — and learn the difference between margin and markup.

Freelance & Gig Work

For freelancers and gig workers

Freelance Tax Calculator Estimate your freelance tax from annual income, business expenses, and your effective tax rate — and see what you actually keep after tax.

Real Estate

Buying and owning property

Mortgage Payment Calculator Calculate your monthly mortgage payment from the loan amount, interest rate, and term — plus total interest and total paid over the life of the loan.

Health & Fitness

Your body, by the numbers

BMI Calculator Calculate your body mass index (BMI) from your weight and height — in metric or imperial units — and see which category you fall into. Calorie Calculator Estimate your daily calorie needs with the Mifflin-St Jeor equation — BMR plus your activity level, for weight maintenance, loss, or gain.

Construction & Home

Building and renovating

Paint Calculator Work out how much paint you need from the wall size, number of walls, and coats — in gallons or litres, with a buy-extra allowance. Tile Calculator Calculate how many tiles you need for a floor or wall — from the area and tile size, including a 10% allowance for cuts and breakage.

E-Commerce & Marketing

Selling online

Ad ROI Calculator Calculate your advertising return on investment (ROI) and ROAS from ad spend and revenue — and see whether your ads actually made money.

Everyday Life

Daily life, calculated

More calculators are coming to this category soon.