Recipes in cups, packages in pounds, forecasts in Fahrenheit — the metric and imperial worlds refuse to merge, so conversion remains a daily need. This converter covers the pairs people actually reach for: length, weight, distance, temperature, and volume.
Como funciona
Pick the conversion direction and enter your value. Length, weight, distance, and volume use fixed multiplicative factors; temperature is the special case, needing both scaling and an offset.
A fórmula
All factors are exact or standard definitions; the inch has been defined as exactly 2.54 cm since 1959. Volume uses the US gallon (3.785 L), not the imperial gallon (4.546 L).
Exemplo resolvido
100 cm → 100 ÷ 2.54 = 39.37 inches. And a pleasant 25 °C day is 25 × 9/5 + 32 = 77 °F.
Perguntas frequentes
Why can't temperature use a simple factor like the others?
Because the scales have different zero points: 0 °C sits at 32 °F. Conversions therefore need the offset — and only −40° reads the same on both scales.
Which gallon does this use?
The US gallon (3.785 liters). The imperial gallon used historically in the UK is about 20% larger (4.546 L) — a frequent source of fuel-economy confusion.
What quick approximations are worth memorizing?
A kilogram is about 2.2 pounds, a mile about 1.6 km, an inch about 2.5 cm, and for temperature: double the °C and add 30 gets you within a couple of °F for everyday weather.