- Choose a category tab (Distance, Mass, Temperature, etc.) or open a dedicated category page from the menu.
- Click the input unit in the left list and the output unit in the right list.
- Type a value in Input — the result appears in Output, or type in Output to convert backward.
- Use the round Swap button to exchange units and values.
- Adjust precision (4–12 significant digits) in the toolbar.
- For bespoke conversions, open Custom and set
1 A = factor B.