How to Convert Celsius to Fahrenheit (Formula + Table)
To convert Celsius to Fahrenheit, multiply by 9/5 (1.8) and add 32: °F = °C × 1.8 + 32. So 30 °C is 86 °F and 37 °C is 98.6 °F. To go back, subtract 32 and multiply by 5/9. The free Temperature Converter does both instantly, plus Kelvin and Rankine.
Key facts
- °F = °C × 1.8 + 32
- °C = (°F − 32) ÷ 1.8
- Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level
- Converter units: Celsius, Fahrenheit, Kelvin, Rankine
Celsius to Fahrenheit table
| °C | °F |
|---|---|
| -40 | -40 |
| -10 | 14 |
| 0 | 32 |
| 10 | 50 |
| 20 | 68 |
| 25 | 77 |
| 30 | 86 |
| 35 | 95 |
| 37 | 98.6 |
| 40 | 104 |
| 100 | 212 |
Worked examples
- 30 °C → °F: 30 × 1.8 = 54, + 32 = 86 °F.
- 100 °F → °C: 100 − 32 = 68, × 5/9 = 37.8 °C.
- 0 °C → K: add 273.15 = 273.15 K.
Using the Temperature Converter
✓Step 1: Pick the units
📏 Open the Temperature Converter and choose the "from" and "to" units.
Step 2: Type a value
Enter the temperature in either box.
Step 3: Read the result
The other box updates instantly as you type – no button needed.
Step 4: Copy it
Use the copy button to paste the result anywhere.
Mental shortcut
For weather, "double it and add 30" gets you close: 20 °C → 70 °F (real 68 °F). Going back, "subtract 30 and halve": 80 °F → 25 °C (real 26.7 °C). Use the exact formula for cooking, medicine and science.
Open the Temperature Converter on pdfseotools.com – free, no sign-up and it works on any device.
Domande frequenti
What is the formula to convert Celsius to Fahrenheit?
°F = °C × 9/5 + 32. For 25 °C: 25 × 1.8 + 32 = 77 °F.
How do I convert Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. For 98.6 °F: 66.6 × 5/9 = 37 °C.
At what temperature are Celsius and Fahrenheit equal?
−40. −40 °C is exactly −40 °F.
Is there a quick mental shortcut?
Double the Celsius value and add 30 for a rough Fahrenheit figure (25 °C → 80 °F, real value 77 °F). It works best for everyday weather temperatures.
Which other units does the converter support?
Celsius, Fahrenheit, Kelvin and Rankine, in either direction.
What is normal body temperature?
About 37 °C or 98.6 °F, though a healthy range is roughly 36.1–37.2 °C.
Summary
✓Multiply by 1.8 and add 32 – or reverse it. For instant, exact results in four units, use the Temperature Converter and explore all free unit converters.
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