Free online calculators — each one shows the matching Excel formula so you can take it back to your own sheet.
Percentage Calculator
Find a percentage of a number, what percent one value is of another, and percentage change.
Loan Payment Calculator
Calculate the monthly payment, total repaid, and total interest on a loan.
Compound Interest Calculator
See how an investment grows with compound interest over time.
Discount Calculator
Work out the sale price and how much you save from a percentage discount.
Margin & Markup Calculator
Turn cost and price into profit, profit margin %, and markup %.
Tip Calculator
Calculate the tip and split the total bill across people.
Sales Tax & VAT Calculator
Add tax to a price and see the tax amount and the total.
ROI Calculator
Work out net profit and return on investment as a percentage.
CAGR Calculator
Find the compound annual growth rate between a start and end value.
Break-Even Calculator
Find how many units you must sell to cover your fixed costs.
Savings Calculator
See what regular monthly contributions grow to with compound interest.