How many unit Converters tools are there?

13: Temperature Converter, Length Converter, Weight and Mass Converter, Volume Converter, Area Converter, Speed Converter, Pressure Converter, Energy Converter and more. Each one shows the formula or rule it uses, so you can check the answer rather than trusting it.

Which unit Converters tool should I use first?

Temperature Converter is the most used on the shelf: convert Celsius, Fahrenheit, Kelvin and Rankine. Every tool works the same way, with inputs at the top and the working underneath the answer.

Is it free, and is my data stored?

Free and private. The calculation runs in your browser, so figures never leave your device, there is no account, and no calculation is logged.

Mondo Knows Tools

Free Unit Converters for Length, Weight, Volume and More

Type one number and see it in every unit of the family at the same time, metric and imperial side by side. Length, weight, volume, area, speed, pressure, energy, power, data storage and temperature are all covered, with the conversion factor and the formula shown so you can check the working.

13 free tools on this shelf, all running in your browser

Area ConverterConvert square metres, square feet, acres and hectares.Cooking MeasurementsCups, tablespoons and millilitres, plus grams for the ingredient you are actually using.Data Storage ConverterConvert bytes, KB, MB, GB, TB and binary units.Energy ConverterConvert joules, calories, kWh, BTU and food calories.Fuel Economy ConverterMPG, L/100 km and km per litre, plus what a trip actually costs.Length ConverterConvert metres, feet, miles, inches and more at once.Power ConverterConvert watts, horsepower, kW and BTU per hour.Pressure ConverterConvert bar, psi, kPa, atm and mmHg.Speed ConverterConvert mph, km/h, m/s, knots and feet per second.Temperature ConverterConvert Celsius, Fahrenheit, Kelvin and Rankine.Torque and Force ConverterNewton-metres, pound-feet and kilogram-force, plus the force a wrench actually applies.Volume ConverterConvert litres, gallons, cups, pints and millilitres.Weight and Mass ConverterConvert kilograms, pounds, ounces, stones and tonnes.

Questions people ask

How many unit Converters tools are there?: 13: Temperature Converter, Length Converter, Weight and Mass Converter, Volume Converter, Area Converter, Speed Converter, Pressure Converter, Energy Converter and more. Each one shows the formula or rule it uses, so you can check the answer rather than trusting it.
Which unit Converters tool should I use first?: Temperature Converter is the most used on the shelf: convert Celsius, Fahrenheit, Kelvin and Rankine. Every tool works the same way, with inputs at the top and the working underneath the answer.
Is it free, and is my data stored?: Free and private. The calculation runs in your browser, so figures never leave your device, there is no account, and no calculation is logged.