Math & finance
Percentages, loans, interest and everyday sums. 23 free tools, all running in your browser.
Percentage calculator
Find a percentage, a change or a share of a total.
Loan calculator
Monthly payment, total interest and the payoff schedule.
Compound interest calculator
See how savings grow with interest and regular deposits.
Discount calculator
Sale price and savings after a percentage off.
Tip calculator
Tip and split the bill between people.
VAT calculator
Add VAT to a net price or take it out of a gross one.
Mortgage calculator
Monthly payment with taxes, insurance and down payment.
ROI calculator
Return on investment and its yearly rate.
Margin and markup calculator
Profit margin, markup and selling price.
Salary converter
Hourly, daily, weekly, monthly and yearly pay.
Fraction calculator
Add, subtract, multiply and divide fractions.
Average calculator
Mean, median, mode, range and standard deviation.
Ratio calculator
Simplify ratios and solve proportions.
Random number generator
Random numbers in a range, with or without repeats.
Credit card payoff calculator
How long to pay off a card and the interest it costs.
Break-even calculator
Units and revenue needed to cover your costs.
Inflation calculator
What money will be worth after years of inflation.
Retirement calculator
Savings at retirement and the income they give.
Simple interest calculator
Interest without compounding, for any period.
Scientific calculator
Trigonometry, powers, roots and logs.
GCD and LCM calculator
Greatest common divisor and least common multiple.
Prime number checker
Is a number prime? Its factors and nearby primes.
Savings goal calculator
How much to save each month to reach a goal.
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