About the Bidirectional Unit Converter
What is the Bidirectional Unit Converter?
This bidirectional unit converter shows A → B and B → A side by side, so you never have to swap units.
The ready-reckoner table is handy to print for a workshop or shop counter.
How to use the Bidirectional Unit Converter
- Value (sample: 1)
- Unit A (sample: Length – Kilometre (km))
- Unit B (sample: Length – Mile (mi))
- Press Convert Both Ways (results also refresh as you type). The result card shows the Forward Conversion, along with Reverse conversion, A → B factor and B → A factor.
Formula used
B = A × k; A = B ÷ k
- k = the A → B conversion factor
Worked example
These are the sample values already filled in the calculator above, and the result it returns for them:
| Input | Sample value |
|---|---|
| Value | 1 |
| Unit A | Length – Kilometre (km) |
| Unit B | Length – Mile (mi) |
| Result | Value |
|---|---|
| Forward Conversion | 1 km = 0.621371 mi |
| Reverse conversion | 1 mi = 1.60934 km |
| A → B factor | 0.62137119 |
| B → A factor | 1.609344 |
Tips for using the Bidirectional Unit Converter
- Use the table for quick lookups of common quantities.
- The reverse factor is simply 1 ÷ the forward factor.