Temperature Converter – Celsius, Fahrenheit

This temperature converter routes every input through exact definitions — °F = °C × 9/5 + 32 and K = °C + 273.15. Enter a value, pick the source and target units, and the result appears instantly with the factor applied shown beside it. Celsius, Fahrenheit, Kelvin and Réaumur measure the same temperatures on shifted and stretched scales, so converting between them is never a single multiplication: an offset must be added or removed as well. The formulas are exact definitions of the scales themselves, so results are limited only by the decimals you carry — two decimals match every laboratory and weather use. A mini table of the head factor makes spot-checks immediate: 0 °C = 32 °F; 10 °C = 50 °F; 25 °C = 77 °F; 37 °C = 98.6 °F; 100 °C = 212 °F. Anchor points make the direction obvious: water freezes at 0 °C = 32 °F = 273.15 K and body temperature is about 37 °C = 98.6 °F; if your result disagrees with those, the offset term was dropped.

1. 1

   Step 1

   Enter the value you want to convert

2. 2

   Step 2

   Select the source unit you are converting from

3. 3

   Step 3

   Select the target unit you want as the result

4. 4

   Step 4

   Read the exact result, then swap or copy as needed

• 1

  Weather shorthand: °F ≈ °C × 2 + 30 is close enough for packing decisions

• 2

  Kelvin never goes negative — a minus sign means an input error

• 3

  Ovens: 180 °C ≈ 350 °F and 200 °C ≈ 400 °F cover most baking

• 4

  Memorize the pair −40 °C = −40 °F, the one point where both scales meet

• Forgetting the +32 (or −32) offset term when switching direction

• Mixing °C increments with K values in gas-law formulas — K has no degree sign

• Doubling a temperature in °F does not double the physical heat