Calculators & Converters

Run calculations, simulations and conversions for free. Work out profit margin, markup, selling price, discounts, interest, measurements and fuel use — all in your browser, with nothing installed and no numbers sent to a server.

Tools are grouped by subject. Business, sales and pricing come first because they are what sellers need most: margin, markup and selling price come from the same arithmetic and have to be read together.

Pricing Calculator

Sixteen commercial operations on one screen: find the cost your price can carry, build the selling price, tell markup from margin, stack successive discounts, work through marketplace fees, wholesale and retail, commissions, lot profit and cost allocation. Everything in the browser, no sign-up.

Choose the operation

Check the values you entered.

Applications in this category

Each application groups related functions on one page, with a guide for each one.

Featured tools

Business, sales and pricing

Profit margin calculatorThe real margin between cost and selling price, with markup alongside for comparison.Markup calculatorMultiplier and percentage markup from cost and selling price.Selling price calculatorSet a selling price from total cost, your desired margin and the fees charged on each sale.Discount calculatorApply a percentage discount and see the final price and how much the buyer saves.Cost price calculatorHow much you can pay for the product while keeping the desired margin on the sale price.Gross and net profit calculatorGross profit, expenses and taxes down to the net profit for the period.Card fee calculatorFee charged, net amount received and the effective rate of your terminal.Break-even calculatorHow many units cover fixed costs, starting from the contribution margin.Percentage increase calculatorApply a percentage to any value and see the increase and the final amount.Minimum selling price calculatorThe floor where a sale covers cost and fees with neither profit nor loss.Desired margin calculatorThe distance between your current price and the price that delivers the margin you want.Net price after fees calculatorWhat to charge so the net amount you need lands in the account, fees included.Sales commission calculatorCommission per sale, what stays with the company and the effective rate for the period.Profit per product calculatorUnit and batch profit, with fees already taken out of the sale price.

Math

Percentage calculatorWhat X% of a number is, plus the value increased and decreased by that percentage.

Unit converters

Temperature converterConvert between Celsius, Fahrenheit and Kelvin using each scale's own formula.Length converterMetres, centimetres, kilometres, inches, feet, yards and miles.

Finance

Compound interest calculatorFinal amount and interest with compounding in every period.

Construction and renovation

Square metre calculatorWall and floor area from width and length, with an optional waste allowance.

Cars and transport

Fuel consumption calculatorkm/L and L/100 km, fuel cost and cost per kilometre from one fill-up.

Health and fitness

BMI calculatorBody mass index and its category band, as an estimate.

Kitchen and food

Recipe scalerScale a recipe's ingredient amounts up or down for a different number of servings.

Date, time and productivity

Date difference calculatorDays, weeks and approximate months between two dates, with no time-zone drift.

Technology and computing

Byte converterDecimal and binary units from bits to terabytes, including the kB versus KiB difference.

Frequently asked questions

Do these calculators send my data anywhere?

No. Every calculation runs in your browser with JavaScript. Nothing you type is sent, stored or linked to you.

Are the results estimates?

It depends on the tool: conversions and pure math are exact within decimal precision, while prices, loans and costs are estimates that depend on the values and conditions you enter.

Do I need an account?

No. All calculators are open, with no sign-up and no usage limit.

All tools