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Temperature Converter

This temperature converter is a straightforward electrical-reference tool for two jobs: converting absolute temperatures and converting temperature differences. It supports Celsius, Fahrenheit, Kelvin, and Rankine so you can move cleanly between ambient references, conductor temperature classes, testing notes, and manufacturer data. The page is intentionally narrow. It converts units, but it does not calculate ampacity derating, conductor temperature rise, or equipment life by itself.

Updated July 10, 2026

30C = 86F, and a 10C temperature rise = 18F = 10K = 18R.

75C = 167F | 40C ambient = 104F | Difference mode removes scale offsets

Choose absolute temperature or temperature difference below and enter the source value and units

Calculator Inputs

Quick Presets

Temperature value to convert

Source temperature unit

Target temperature unit

Type of temperature conversion

Calculation Results

Enter values above to see calculation results

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Calculation history

Example Calculations

Convert 30C ambient to FahrenheitQuickly translate a common electrical ambient reference point.InputsInput Temperature: 30From Unit: CelsiusTo Unit: FahrenheitConversion Type: Temperature conversion
Convert an 18F temperature rise to CelsiusUse difference mode so the scale offset is not applied.InputsInput Temperature: 18From Unit: FahrenheitTo Unit: CelsiusConversion Type: Temperature difference

How to Use

How to use the temperature converter

Use this page when the task is simple unit conversion, not when you need a full conductor-derating or thermal-design workflow.

1. Choose whether the number is an absolute temperature or a temperature difference

  • Temperature Value is for actual temperatures such as 30C ambient, 75C conductor rating, or 104F enclosure air.
  • Temperature Difference is for rises or drops such as a 10C temperature rise or an 18F change.
  • This distinction matters because absolute temperatures use offsets between scales, while differences do not.

2. Enter the source value and select the source and target units

  • The page supports Celsius, Fahrenheit, Kelvin, and Rankine.
  • Absolute-temperature mode will reject values below absolute zero.
  • The result section also shows the equivalent values in all four supported scales for quick cross-checking.

3. Use the right mode for common electrical reference points

  • 30C = 86F is a common ambient reference in conductor ampacity workflows.
  • 40C = 104F is a common reference point in equipment and testing discussions.
  • 60C, 75C, and 90C are familiar conductor or terminal temperature classes.
  • A 10C temperature difference is 18F, 10K, and 18R.

4. Know what this page does not do

  • It does not apply NEC ambient-correction factors.
  • It does not calculate conductor ampacity, voltage drop, or thermal rise.
  • It does not decide whether a piece of equipment is acceptable at a given temperature. You still need the product listing, manufacturer instructions, and the governing installation standard.

5. Use the related tools when the job becomes more specific

Common Applications

Converting ambient references such as 30C, 40C, and 104F
Checking conductor or terminal temperature classes such as 60C, 75C, and 90C
Converting temperature rises and drops without mixing scale offsets
More applications. Open to review 2 additional use cases.
Translating manufacturer or test-sheet temperatures between U.S. and SI notation
Supporting quick electrical and thermal reference work without turning the page into a fake derating engine

Frequently Asked Questions

What is the difference between converting a temperature and converting a temperature difference?
Absolute temperatures use offsets between scales, so 30C becomes 86F and 303.15K. Temperature differences do not use offsets, so a 10C rise is simply an 18F rise and a 10K rise.
Why does the page support Rankine?
Rankine is the absolute Fahrenheit-scale unit. It is less common than Kelvin, but it can still appear in thermal engineering references and older U.S. calculations. Supporting it keeps the page useful when documentation mixes SI and U.S. thermal notation.
Does this page calculate NEC temperature correction for conductors?
No. This page only converts units. If you need conductor derating or final ampacity decisions, move to a conductor-specific workflow such as the temperature-correction or wire-size pages.
Why are 30C, 40C, 60C, 75C, and 90C called out so often in electrical work?
Those values show up often because they are common ambient references or conductor and terminal temperature classes in electrical design and installation work. The converter helps you move those reference points cleanly between Celsius and Fahrenheit without adding any code assumptions on its own.

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