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Fahrenheit to Celsius Converter

Measurement

Convert Fahrenheit to Celsius instantly for oven temperatures, weather, and body heat. Also converts Kelvin and Rankine — free, no sign-up required.

Reviewed by the thecalcu.com team · Last updated June 27, 2026

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What is a °F to °C?

The Fahrenheit to Celsius Converter converts temperature values between the Fahrenheit scale used in the United States and the Celsius (Centigrade) scale used throughout India and most of the world. It also covers Kelvin (the scientific standard) and Rankine (an absolute scale using Fahrenheit-sized degrees).

The US Fahrenheit scale and the international Celsius scale are the two temperature units most frequently needing conversion in everyday life. US baking recipes list oven temperatures in °F; Indian ovens use °C. US weather forecasts report in °F; Indian weather apps use °C. US medical literature uses °F for body temperature; Indian hospitals use °C.

Common reference points:

Fahrenheit (°F) Celsius (°C) Context
32 0 Freezing point of water
98.6 37 Normal human body temperature
212 100 Boiling point of water at sea level
350 177 Standard baking oven (medium heat)
−40 −40 The one point where both scales are equal

The converter supports all four major temperature scales. Use the Temperature Converter for a complete multi-unit reference table covering all four scales simultaneously. For cooking-specific unit conversions (cups, tablespoons, fluid ounces), use the Cooking Measurement Converter.

All conversion runs client-side. No data is transmitted to any server.

Why Use a Fahrenheit to Celsius Converter?

US-sourced content, recipes, travel guides, medical references, HVAC manuals, industrial specifications, routinely lists temperatures in Fahrenheit. Any Indian professional, student, or home cook working with US materials needs fast conversion without memorising the formula.

Cooking use case: A food blogger is adapting a US recipe that says "bake at 425°F for 20 minutes." The converter immediately gives 218°C, which maps to Gas Mark 7 on European oven dials. Without the converter, the formula (425−32)×5/9 must be done mentally or on a calculator.

Meteorology use case: An Indian student on a US university exchange is told the weather will be in the 40s this weekend. 40°F = 4.4°C, bring a jacket. The converter makes the temperature immediately interpretable.

Who Should Use This Converter?

Indian home cooks and food bloggers adapting US or British recipe books where oven temperatures are in Fahrenheit. The 325–450°F baking range is the most commonly converted band.

Software developers and data engineers working with US-sourced temperature sensor data, IoT device output, or weather APIs that return Fahrenheit values that need to be displayed in Celsius for Indian users.

Students and researchers reading US scientific papers or NIST/FDA documentation that uses Fahrenheit for certain historical or regulatory contexts, particularly medical and food-safety thresholds.

Travellers from India planning trips to the US who need to interpret weather forecasts, thermostat settings, and pool/hot-tub temperatures in a unit they understand. Use the Cooking Measurement Converter when adapting US recipes on the trip.

What Insights Does the Converter Give You?

The converter shows the converted value at your chosen precision and a reference table listing the same input in all four scales simultaneously, useful when scientific documentation uses Kelvin while the same value needs to be communicated in Celsius to a general audience.

Scale relationships:

  • Fahrenheit and Celsius share a non-linear relationship (offset plus scale factor), so no mental shortcut is exact, the converter handles the formula precisely.
  • Kelvin and Celsius differ by a fixed offset of 273.15 with no scale factor, the same degree size, different zero point.
  • Rankine and Fahrenheit also differ by a fixed offset (459.67°R = 0°F), again with no scale factor, used in US engineering thermodynamics.

How to use this °F to °C calculator

  1. Enter a temperature value in the left input field.
  2. Select the input unit from the left dropdown, Fahrenheit (°F) for most US-to-India conversions.
  3. Select the output unit from the right dropdown, Celsius (°C) for Indian display.
  4. Read the result, it updates instantly with each keystroke.
  5. Use the swap button (⇅) to reverse direction (e.g. from Celsius → Fahrenheit for checking your oven against a US recipe).
  6. Check the reference table at the bottom to see the value in all four scales side by side.

Formula & Methodology

Fahrenheit ↔ Celsius:
°C = (°F − 32) × 5/9 °F = (°C × 9/5) + 32

Celsius ↔ Kelvin:
K  = °C + 273.15 °C = K − 273.15

Celsius ↔ Rankine:
°R = (°C + 273.15) × 9/5 °C = (°R − 491.67) × 5/9

All conversions route through Celsius as the canonical intermediate unit, so Fahrenheit → Kelvin is computed as °F → °C → K in two steps. This avoids N² formula combinations and guarantees consistency.

Common oven temperature reference:

| °F | °C | Gas Mark | Description |
|---|---|---|---|
| 275 | 135 | 1 | Very slow / warm |
| 325 | 163 | 3 | Slow / low |
| 350 | 177 | 4 | Moderate / medium |
| 375 | 191 | 5 | Moderately hot |
| 400 | 204 | 6 | Hot |
| 425 | 218 | 7 | Very hot |
| 450 | 232 | 8 | Extremely hot |

Frequently Asked Questions

The formula to convert Fahrenheit to Celsius is °C = (°F − 32) × 5/9. Subtract 32 from the Fahrenheit value first, then multiply by 5 and divide by 9. To reverse it (Celsius to Fahrenheit), use °F = (°C × 9/5) + 32. These are exact formulas, there is no rounding involved in the conversion itself.
350°F equals exactly 176.67°C, which rounds to 177°C. This is a standard medium oven temperature used for baking cakes, cookies, and casseroles. Most international ovens and recipes use Celsius, so 350°F → 177°C is one of the most commonly looked-up baking conversions. Other common oven temperatures: 325°F = 163°C, 375°F = 191°C, 400°F = 204°C.
98.6°F is exactly 37.0°C, the commonly cited average normal human body temperature. In practice, normal body temperature ranges from about 36.1°C to 37.2°C (97°F to 99°F). Indian hospitals and clinics use Celsius for all clinical measurements, so US-sourced medical references in Fahrenheit need conversion when interpreting them.
Fahrenheit and Celsius are equal at −40°. This is the one point where both scales intersect: −40°F = −40°C. This can be verified using either formula: (−40 − 32) × 5/9 = −40, and (−40 × 9/5) + 32 = −40. It is a useful mnemonic for checking your formula, the crossover point is −40.
0°F equals −17.78°C. The Fahrenheit scale sets 0°F at the freezing point of a brine solution (water, ice, and ammonium chloride), a reference point chosen by Daniel Gabriel Fahrenheit in the early 18th century. The freezing point of pure water on the Fahrenheit scale is 32°F, which equals 0°C.
Absolute zero is −273.15°C or −459.67°F. This is the theoretical minimum temperature, the point at which all molecular motion stops. The Kelvin scale sets 0 at absolute zero, so 0 K = −273.15°C = −459.67°F. The Rankine scale similarly starts at absolute zero but uses Fahrenheit-sized degrees, so 0 °R = 0 K.
The United States is one of the very few countries that did not officially adopt the metric system and its associated Celsius temperature scale. India metricated in 1957 and uses Celsius (also called Centigrade) for weather, medicine, science, and industry. The practical implication for Indian professionals is that US weather reports, oven manuals, and medical references often use Fahrenheit and need conversion.
Kelvin and Celsius differ by exactly 273.15 degrees, K = °C + 273.15. The Kelvin scale uses the same degree size as Celsius but starts at absolute zero rather than the freezing point of water. Kelvin is the SI base unit of temperature and is used in science, engineering, and thermodynamics. For everyday temperatures, Celsius and Kelvin are related by a fixed offset with no multiplication involved.
Enter your temperature value in the first field and select the input unit (°F, °C, K, or °R) from the left dropdown. Select the output unit from the right dropdown. The converted result updates instantly. Use the swap button (⇅) to reverse the conversion direction. The reference table at the bottom shows the same value converted into all four units simultaneously.
A useful mental approximation: subtract 30 from the Fahrenheit value and halve the result. For example, 70°F → (70−30)/2 = 20°C (exact: 21.1°C). This is about 1°C off for typical weather temperatures. For precise calculations, baking, medical, scientific work, use the exact formula (°F − 32) × 5/9 rather than the approximation.
100°C equals 212°F, the boiling point of water at sea level (standard atmospheric pressure). This is the upper fixed point on which the Celsius scale is defined, 0°C is the freezing point and 100°C is the boiling point of pure water. At higher altitudes (like Shimla or Ladakh), the boiling point drops below 100°C because of lower atmospheric pressure.
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