Free Online Calculators for Percentages, Money & Maths
Percentage, discount, margin, interest, mortgage, tip, tax and maths calculators. Instant, accurate results that are calculated privately in your browser.
15 free tools
Percentage Calculator
Three calculators in one: find X% of a number, what percent one number is of another, and the percentage change between two values.
Percentage Increase Calculator
Increase a number by a percentage, or find the percentage increase between an original and a new value.
Percentage Decrease Calculator
Reduce a number by a percentage, or find the percentage decrease from an original value to a lower one.
Discount Calculator
See the sale price and how much you save, including stacked "extra % off" discounts.
Markup Calculator
Set a selling price from cost and markup, or work out the markup and margin of an existing price.
Profit Margin Calculator
Calculate gross profit, margin and markup from cost and revenue — or the price needed for a target margin.
Simple Interest Calculator
Calculate simple interest and the total amount for any principal, rate and period in years, months or days.
Compound Interest Calculator
Project savings growth with compound interest, compounding frequency and regular contributions.
Mortgage & Loan Amortization Calculator
Monthly payment, total interest and a full amortization schedule — with extra-payment savings and CSV export.
Tip Calculator
Work out the tip, total bill and each person's share when splitting the bill.
Sales Tax Calculator
Add sales tax or VAT to a net price, remove it from a gross price, or find the tax rate used.
Break-Even Calculator
Find how many units you must sell to cover fixed costs, plus break-even revenue and contribution margin.
Average Calculator
Mean, median, mode, range, standard deviation and quartiles for any list of numbers.
Ratio Calculator
Solve proportions A : B = C : X and simplify ratios to their lowest terms.
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers, with simplified answers and steps.