Calculators

All 29 calculators on Tapwerk — free, no sign-up, and everything runs right in your browser.

Percentage CalculatorPercent of, share & change›Age CalculatorExact age in years, months & days›Date CalculatorDays between dates, or add/subtract›Unit ConverterLength, weight, temperature & volume›Time Zone ConverterConvert a time between two time zones›Currency ConverterConvert between currencies using live rates›BMI CalculatorBody Mass Index from height & weight›Tip CalculatorSplit a bill and calculate the tip›Number Base ConverterConvert between binary, octal, decimal & hex›A+Grade CalculatorTurn test points into a percentage and grade›ØWeighted Average CalculatorAverage grade or score with weights›⛽Fuel Cost CalculatorWhat a car trip costs in fuel›🛢Fuel Consumption CalculatorLiters per 100 km and MPG from a fill-up›🔌Electricity Cost CalculatorWhat an appliance costs to run›➗Split Cost CalculatorWho owes whom after a shared trip or dinner›🍲Recipe ScalerScale ingredient amounts to any number of servings›▦Tile CalculatorHow many tiles you need for a floor or wall›🖌Paint CalculatorHow much wall paint you need›🧻Wallpaper CalculatorHow many wallpaper rolls you need›🧱Concrete CalculatorVolume and bags of concrete for a slab›📐Square Meter CalculatorFloor area of one or more rooms›ΩOhm’s Law CalculatorVoltage, current, resistance and power from any two›WWatts, Amps & Volts CalculatorConvert between watts, amps and volts›▥Resistor Color Code CalculatorRead a 4-band resistor’s value from its colors›🔋Battery Life CalculatorRuntime from capacity (mAh) and current draw›⇩Download Time CalculatorHow long a file takes to download›▣PPI CalculatorPixel density of a screen from resolution and size›▭Aspect Ratio CalculatorFind the ratio or the missing width/height›🛒Unit Price CalculatorCompare products by price per kg, liter or piece›