Temperature Converter

Free Temperature Converter — switch between Celsius, Fahrenheit, Kelvin and Rankine with full formulas and instant updates.

886.4K uses Updated · 2026-05-12 Runs locally · zero upload
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How to Use Temperature Converter

The Temperature Converter transforms a single temperature value between four scales and shows every alternative at once.

  1. Enter a numeric temperature.
  2. Pick the source scale — °C, °F, K, or °R.
  3. Pick the target scale — Any of the four.
  4. Read the result — Plus all other scale equivalents.

Formula & Theory — Temperature Converter

°C → °F : F = C·1.8 + 32
°F → °C : C = (F − 32) / 1.8
°C → K  : K = C + 273.15
°C → °R : R = (C + 273.15)·1.8
ScaleReference points
CelsiusWater freezes 0 °C / boils 100 °C
FahrenheitWater freezes 32 °F / boils 212 °F
KelvinAbsolute zero 0 K
RankineAbsolute zero 0 °R

Assumptions and Limits

The Temperature Converter handles ideal arithmetic — it does not enforce a lower bound. Values below absolute zero are physically impossible but the math still works for educational comparisons.

Use Cases for Temperature Converter

  • Cooking — Convert recipes between °C and °F.
  • Travel — Read foreign weather forecasts.
  • Science class — Translate between Celsius and Kelvin for gas-law problems.
  • US engineering — Work in Rankine for thermodynamic cycles.

The Temperature Converter is the quickest path between the four common temperature scales.

Frequently asked questions about Temperature Converter

How accurate is the Temperature Converter?

The Temperature Converter applies the exact linear formulas between Celsius, Fahrenheit, Kelvin and Rankine. Results are mathematically exact.

When should I use a Temperature Converter?

Use the Temperature Converter when reading recipes, science textbooks, weather forecasts or thermodynamic data that mix scales.

Why include Rankine?

Rankine is still used in some US engineering disciplines. The Temperature Converter supports it for completeness.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.