Temperature Conversion Formulas
Temperature is the only common conversion that is not a simple multiplication, which is why so many people search for Celsius to Fahrenheit every day. The exact formulas are: F = (C x 9/5) + 32, C = (F - 32) x 5/9, and K = C + 273.15. This converter applies them instantly in both directions.
Key Temperature Reference Points
| Description | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Water freezes | 0 C | 32 F | 273.15 K |
| Room temperature | 20 C | 68 F | 293.15 K |
| Normal body temperature | 37 C | 98.6 F | 310.15 K |
| Water boils | 100 C | 212 F | 373.15 K |
| Scales meet | -40 C | -40 F | 233.15 K |
Quick mental math: to estimate Fahrenheit from Celsius, double the Celsius value and add 30. For example, 20 C is roughly 70 F (exactly 68 F).
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 25 C = 77 F.
How do I convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. For example, 98.6 F = 37 C.
What is Kelvin used for?
Kelvin is the scientific temperature scale starting at absolute zero (-273.15 C). Add 273.15 to any Celsius value to get Kelvin.
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