When you just need a quick answer and do not want to hunt for a dedicated converter, this all-in-one tool covers the ten quantities people convert most. For more units and every result at once, follow the links to the dedicated converters.
How to use the Conversion Calculator
- Quantity
- Value
- From
- To
Everything runs in your browser, so results appear instantly and nothing you type is sent to a server.
How it works
Each unit is stored as an exact factor relative to an SI base unit. Your value is converted to the base unit and then to the target unit.
Formula
result = value × (factor of “from” unit ÷ factor of “to” unit), with offsets for temperatureWorked example
Inputs — Quantity: Length; Value: 1; From: mile (mi); To: metre (m).
Results — Result = 1,609.344 metre; Conversion factor = 1 mile (mi) = 1,609.344 metre (m); Quantity = Length.
Frequently asked questions
Which units are exact?
All factors are exact definitions, such as 1 in = 2.54 cm and 1 lb = 0.45359237 kg.
Why is temperature different?
Temperature scales have different zero points, so the converter adds an offset as well as multiplying.
What formula does the Conversion Calculator use?
result = value × (factor of “from” unit ÷ factor of “to” unit), with offsets for temperature.