Invoice GeneratorMake a professional invoice in your browser: logo, line items, tax or VAT, discount, shipping, deposit.
Calculators & Converters
Quick answers to everyday maths: percentages and discounts, the time between two dates, unit and file-size conversions, how long a download will take, and time-zone comparisons using your browser’s own time-zone database. Each calculator shows the formula it uses so you can check the result.
Percentage CalculatorWork out a percentage of a number, what percent one number is of another, percentage change, and adding or subtracting a percentage — all on one page.
Discount CalculatorCalculate the sale price after a discount, an optional second (stacked) discount and sales tax or VAT, plus how much you save in total.
BMI CalculatorCalculate body mass index (BMI) for adults in metric or imperial units, see the WHO category and the weight range that corresponds to a BMI of 18.5–24.9 for your height.
Date Difference CalculatorCount the days, weeks, months and years between two dates, including working days with a weekend you choose.
Time Zone ConverterConvert a date and time from one time zone to several others, with daylight saving time handled by your browser’s time-zone database.
Unit ConverterConvert between metric and imperial units for length, mass, temperature, area, volume, speed, time, pressure and energy, with a table of every unit at once.
File Size ConverterConvert file sizes between bytes, kilobytes, megabytes, gigabytes and terabytes in both decimal (1000) and binary (1024) units — or drop a file to see its exact size.
Download Time CalculatorEstimate how long a download or upload takes from the file size and connection speed (Mbps, Gbps or MB/s), with an allowance for protocol overhead.
Currency Converter (Manual Rate)Convert an amount between currencies using an exchange rate you enter from your bank, card provider or exchange office.
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