What is the formula to convert Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. Example: 20°C = (20 × 1.8) + 32 = 68°F.
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Convert between Celsius, Fahrenheit, and Kelvin easily
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Base unit: Celsius
Available units: 3 temperature scales
Water freezes at 0°C and boils at 100°C at sea level. Widely used worldwide.
Water freezes at 32°F and boils at 212°F. Commonly used in the United States.
Absolute temperature scale where 0K is absolute zero. Used in scientific work.
Celsius to Fahrenheit: multiply by 9/5 then add 32. Fahrenheit to Celsius: subtract 32 then multiply by 5/9. Kelvin: add or subtract 273.15 from Celsius.
Temperature scales measure the same physical property — thermal energy — using different reference points.
**Celsius (°C)**: Based on water freezing at 0° and boiling at 100° at standard atmospheric pressure. Used by most of the world for weather, cooking, and science.
**Fahrenheit (°F)**: The official scale in the United States. Water freezes at 32°F and boils at 212°F. The scale has 180° between these points versus Celsius's 100°.
**Kelvin (K)**: The SI base unit for temperature, used in physics and chemistry. Absolute zero (the coldest theoretically possible temperature, −273.15°C) is 0 K. Kelvin has no degree symbol — it is just 'K'.
**Conversion formulas:**
• °F = (°C × 9/5) + 32
• °C = (°F − 32) × 5/9
• K = °C + 273.15
• °C = K − 273.15
The calculator applies these exact formulas and shows all three scales simultaneously as you type — no need to pick which direction to convert.
Concise answers for common searches — definitions, steps, and comparisons.
°F = (°C × 9/5) + 32. Example: 20°C = (20 × 1.8) + 32 = 68°F.
Yes — all conversions run locally in your browser. No data is uploaded.
Enter your temperature in Celsius, Fahrenheit, or Kelvin. All three fields update simultaneously — type in whichever unit you have.
The moment you type, all three temperature scales update in real time. No need to select a direction or click Convert.
Click the copy icon next to any value to copy just that temperature, or use the copy-all button to get the full three-scale summary.
Double-check oven or incubator temperatures by reading the same value in both °C and °F before starting a recipe or experiment.
Input
72°FOutput
22.2°C | 295.4 K(72 − 32) × 5/9 = 40 × 5/9 = 22.2°C. Comfortable room temperature.
Input
38.5°COutput
101.3°F | 311.7 K(38.5 × 9/5) + 32 = 69.3 + 32 = 101.3°F. Above the 100.4°F fever threshold.
Common real-world scenarios where this tool saves time.
US visitors traveling to metric countries (or vice versa) need to interpret weather in a different scale. 30°C is hot (86°F); 10°C is cool (50°F); 0°C is freezing (32°F).
US recipes in Fahrenheit need conversion for metric ovens. 350°F = 177°C (moderate oven); 425°F = 218°C (hot oven); 300°F = 149°C (slow roast).
Chemistry and physics calculations use Kelvin. Room temperature is ~298 K (25°C). Liquid nitrogen is 77 K (−196°C).
Comfortable indoor temperature ranges: 68–72°F (20–22°C) in summer, 65–68°F (18–20°C) in winter.
Normal human body temperature: 98.6°F = 37.0°C. Fever threshold: 100.4°F = 38.0°C. Hypothermia: below 95°F / 35°C.
Step-by-step chains that connect related tools for common tasks.
Understand the temperature forecast before traveling between US and metric countries.
Important temperatures across all three scales.
| Temperature | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| Absolute zero | −273.15 | −459.67 | 0 |
| Water freezes | 0 | 32 | 273.15 |
| Room temperature | 20–22 | 68–72 | 293–295 |
| Normal body temp | 37 | 98.6 | 310.15 |
| Water boils (sea level) | 100 | 212 | 373.15 |
| Celsius = Fahrenheit | −40 | −40 | 233.15 |
Oven temperatures for US to metric conversion.
| Description | Fahrenheit | Celsius |
|---|---|---|
| Very slow / warm | 250–275°F | 121–135°C |
| Slow roast | 300°F | 149°C |
| Moderate | 350°F | 177°C |
| Moderate-hot | 375–400°F | 191–204°C |
| Hot / pizza | 425–450°F | 218–232°C |
| Very hot / broil | 500°F+ | 260°C+ |
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37°C = 98.6°F — normal adult body temperature. Formula: (37 × 9/5) + 32 = 66.6 + 32 = 98.6. Fever is generally defined as 38°C (100.4°F) or higher.
100°F = 37.78°C. Formula: (100 − 32) × 5/9 = 68 × 5/9 = 37.78°C. A temperature of 100.4°F (38°C) is considered a fever in adults.
0°C = 32°F — the freezing point of water. Formula: (0 × 9/5) + 32 = 32°F. Winter temperatures at or below 32°F mean surface water can freeze.
Absolute zero is 0 K = −273.15°C = −459.67°F. It is the theoretical minimum temperature — the point at which particles have minimum kinetic energy. Nothing in the universe is known to reach exactly 0 K.
Both scales are equally accurate — they measure the same thing. Celsius has a more logical structure (0° = freeze, 100° = boil) which makes it easier for calculations. Fahrenheit offers finer single-degree resolution for outdoor human-comfort temperatures (32–100°F covers most weather humans experience).
−40° is the only point where Celsius and Fahrenheit are equal. At −40°C = −40°F, both scales coincide. You can verify: (−40 × 9/5) + 32 = −72 + 32 = −40°F.
The US adopted Fahrenheit before the metric system was standardized. Unlike most countries that metricated in the 19th and 20th centuries, the US kept imperial units in everyday use. Fahrenheit is still used for weather, body temperature, and cooking in the US — Celsius and Kelvin are used in US science and medicine.
350°F = 177°C — a moderate oven temperature used for most baking. Common oven conversions: 300°F = 149°C (slow), 375°F = 191°C (moderate-hot), 400°F = 204°C (hot), 450°F = 232°C (very hot).
Science primarily uses Kelvin (K) and Celsius (°C). Kelvin is the SI base unit and is required for thermodynamics calculations (gas laws, Boltzmann equation) because it starts at absolute zero and has no negative values. Celsius is used for reporting results in most non-US scientific literature.
Temperature values you type are converted locally in your browser—they are not uploaded to EverydayTools servers.
For scientific applications, use SI units (Kelvin). Medical temperatures should be verified with a calibrated thermometer.
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Reviewed on 2026-06-08.