Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Rømer, Newton, and Delisle with configurable rounding and explicit shareable permalinks.

How to Use

  1. Enter a temperature value.
  2. Select the source scale.
  3. Choose how many decimal places to round to.
  4. View the converted values for all supported scales.
  5. Use Share Link only when you want to create a permalink.
Converter
Fast, deterministic, browser-based conversion.
Ready
Examples: 0, 25, 98.6, 273.15
Pick the scale of the value you entered.
Controls display precision only.
Useful when you need fixed display behavior.
Quick Reference
Common anchor points across major scales.
Water Freezes
0°C / 32°F / 273.15K
Water Boils
100°C / 212°F / 373.15K
Absolute Zero
−273.15°C / 0K
Room Temp
~20–25°C / 68–77°F

Kelvin cannot be negative in physical temperature use, but the tool will still validate and display deterministic math according to the selected scale rules in JS.

Converted Values

All supported scales update from the same source value.

Celsius

—
°C

Fahrenheit

—
°F

Kelvin

—
K

Rankine

—
°R

Réaumur

—
°Ré

Rømer

—
°Rø

Newton

—
°N

Delisle

—
°De
Enter a value and select a source scale to see all conversions.
Details / Reference

Base Strategy

The converter normalizes the source value to a base temperature in Celsius, then derives all other scales from that normalized value.

Common Formulas

  • °F = (°C × 9/5) + 32
  • K = °C + 273.15
  • °R = K × 9/5
  • °Ré = °C × 4/5
  • °Rø = (°C × 21/40) + 7.5
  • °N = °C × 33/100
  • °De = (100 − °C) × 3/2
Conversion details and formula notes will appear here.

FAQ

Why are Kelvin and Rankine offset scales?

Both start at absolute zero, but Kelvin uses Celsius-sized degrees while Rankine uses Fahrenheit-sized degrees.

Why can Delisle go down as Celsius goes up?

Delisle is an inverted historical scale, so larger Celsius values produce smaller Delisle values.

Does rounding change the actual conversion?

No. Rounding only affects display output. The underlying conversion logic should remain deterministic in the JS layer.

Will the page URL change while I type?

No. The permalink should only be generated when the Share Link action is used.

Tool Info

Last updated:

Includes support for 8 temperature scales, configurable rounding, and explicit permalink behavior.