Temperature Converter

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How to Use the Temperature Converter

1. Enter your input values above
2. Results update automatically
3. Copy or download the output

What is a Temperature Converter?

A Temperature Converter instantly converts between Celsius (°C), Fahrenheit (°F), and Kelvin (K) — the three major temperature scales used worldwide. Celsius is used by most countries and in science, Fahrenheit is used primarily in the United States for everyday weather and cooking, and Kelvin is the SI base unit used in physics and chemistry (starting from absolute zero: −273.15°C or −459.67°F). Temperature conversion is one of the most frequently searched conversion tools online, used daily by travelers checking weather forecasts, cooks adapting international recipes, and anyone comparing temperatures across different measurement systems.

How Does It Work?

Enter a temperature in any scale and instantly see the conversions to the other two. The formulas are linear transformations (all three scales are linearly related). Quick reference points are displayed for context: freezing point of water (0°C = 32°F = 273.15K), boiling point of water (100°C = 212°F = 373.15K), room temperature (~20°C = 68°F = 293.15K), and body temperature (37°C = 98.6°F = 310.15K).

Formula

°F → °C: °C = (°F − 32) × 5/9\n°C → °F: °F = (°C × 9/5) + 32\n°C → K: K = °C + 273.15\nK → °C: °C = K − 273.15\n°F → K: K = (°F − 32) × 5/9 + 273.15\n\nCommon Reference Points:\n• Absolute Zero: −273.15°C / −459.67°F / 0K\n• Water Freezes: 0°C / 32°F / 273.15K\n• Room Temp: 20°C / 68°F / 293.15K\n• Body Temp: 37°C / 98.6°F / 310.15K\n• Water Boils: 100°C / 212°F / 373.15K\n\nQuick Mental Math: °C→°F: Double, subtract 10%, add 32\n°F→°C: Subtract 32, halve, add 10%

Who Uses This Tool?

• International travelers checking weather forecasts in foreign countries
• Home cooks converting oven temperatures between US (F) and European (C) recipes
• Science students and researchers working across different measurement systems
• Medical professionals converting body temperature readings
• Anyone reading global news about climate change (scientific data is in Celsius)

Pro Tips

• For oven temperature: 350°F ≈ 180°C, 400°F ≈ 200°C, 450°F ≈ 230°C. Most recipes work within ±10° of these conversions
• Celsius and Fahrenheit are equal at −40° (−40°F = −40°C). A fun trivia point but not practically useful
• Quick mental conversion: °C to °F: double it, subtract 10%, add 32. 20°C → 40 − 4 + 32 = 68°F. Accurate to within 1-2°F
• Kelvin does NOT use the degree symbol (°) — it's just 'K,' not '°K.' This is because Kelvin is an absolute scale, not a relative one

Frequently Asked Questions about Temperature Converter

Why does the US still use Fahrenheit?

Historical inertia and cultural familiarity. Fahrenheit provides more granularity for everyday temperatures (0°F = very cold, 100°F = very hot, roughly matching human experience). All US attempts to metricate (1975 Metric Conversion Act) have been voluntary and largely unsuccessful outside of science and medicine.

Which temperature scale is most accurate?

All three are equally precise — they're just different ways of measuring the same thing. Kelvin is preferred in science because it starts at absolute zero (no negative values) and is directly proportional to thermal energy. Celsius is convenient because water freezes at 0 and boils at 100.

Free online Temperature Converter — no signup, 100% client-side processing. All data stays in your browser.