Metric ↔ Imperial, Without the Memorizing
This converter covers the four categories people need daily — length, weight, temperature and volume — across metric and US units. Values convert through exact standard factors (1 inch = 2.54 cm, 1 lb = 453.592 g), so results are precise, not rounded folklore.
The Conversions Worth Knowing by Heart
| From | To | Quick rule |
|---|---|---|
| Inches | Centimeters | × 2.54 exactly |
| Pounds | Kilograms | ≈ halve it, then −10 % |
| Miles | Kilometers | × 1.6 (or × 8/5) |
| °F | °C | −32, then × 5/9 |
| US gallons | Liters | × 3.785 |
Temperature Is Different
Length, weight and volume scale by a factor; temperature also shifts its zero point. That's why 0 °C = 32 °F and the formula needs both a multiplication and an offset. Kelvin is Celsius shifted by 273.15 — the scale scientists use because it starts at absolute zero.
US vs. UK Units — A Warning
A US fluid ounce (29.57 ml) differs from a UK one (28.41 ml), and a US gallon (3.785 l) is far smaller than a UK gallon (4.546 l). This converter uses US customary volumes — relevant when reading British recipes or fuel economy figures.