Everyday calculators
Clear answers, with the working shown. Choose a section to find the right tool quickly.
Percentage calculator
Find a percentage of a number.
Percentage change
Compare a new value with an original nonzero value.
Percentage difference
Compare two nonnegative values using their average.
Discount calculator
Find the final price and saving after a percentage discount.
Sales tax calculator
Add a user-supplied sales tax rate to a net amount.
Tax inclusive calculator
Separate tax from a tax-inclusive total.
Profit margin calculator
Calculate profit and gross margin from cost and selling price.
Markup calculator
Set a selling price using a markup on cost.
Break even calculator
Estimate sales units needed to cover fixed costs.
Simple interest calculator
Estimate simple interest without compounding.
Compound interest calculator
Estimate growth with regular compounding and no contributions.
Loan payment calculator
Estimate a fixed monthly amortizing loan payment.
Savings goal calculator
Find the monthly saving needed without investment returns.
Tip splitter
Split a bill including a percentage tip.
Ratio simplifier
Reduce two integers to their simplest ratio.
Average calculator
Compute an arithmetic mean of supplied numbers.
Weighted average calculator
Compute an average using value and weight pairs.
BMI calculator
Calculate adult body mass index from metric measurements.
Fuel cost calculator
Estimate journey cost from distance, consumption and fuel price.
Speed calculator
Find average speed from distance and duration.
Length converter
Convert a length between common metric and imperial units.
Mass converter
Convert mass using exact conventional unit factors.
Temperature converter
Convert Celsius, Fahrenheit and Kelvin.
Area converter
Convert common land and floor-area units.
Data size converter
Convert decimal SI and binary IEC data-size units.