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Thermal Resistance Converter (K/W / °C/W / °F·h/BTU)

· Last updated：2026-08-01

Convert thermal resistance between K/W (kelvin per watt, SI base), °C/W (1 = 1 K/W, since Δ1 K = Δ1 °C exactly), and °F·h/BTU International Table (1 = 1.8956342 K/W). Converts via K/W to the target unit and lists the equivalent value in all three units for reference. Reference values: CPU heatsink ≈ 0.1–0.3, LED thermal path ≈ 5–20, natural convection ≈ 1 K/W.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert non-negative thermal resistance values between K/W, °C/W, and °F·h/BTU (IT). Enter a value, choose the input and output units, set decimal places from 0 to 10, and view the converted result with equivalent values in all three units.

When to use

  • Convert heat sink or thermal path values between SI and Imperial thermal resistance units.
  • Compare thermal resistance specifications reported in K/W, °C/W, or °F·h/BTU (IT).
  • Check reference values for CPU heatsinks, LED thermal paths, or natural convection.

How it works

  1. 1Enter a non-negative thermal resistance value.
  2. 2Select the input unit: K/W, °C/W, or °F·h/BTU (IT).
  3. 3Choose the output unit and specify the number of decimal places from 0 to 10.
  4. 4The converter calculates through K/W and returns the selected conversion plus equivalent values in all three units.

Use cases

  • Heat sink specification checks for CPU cooling designs.
  • LED thermal path comparisons across engineering documents.
  • Thermal resistance calculations involving natural convection reference values.

Examples

1. Convert a CPU heatsink rating to °F·h/BTU

Thermal engineer

Background

A CPU heatsink specification is listed as 0.5 K/W, but a comparison reference uses °F·h/BTU (IT).

Problem

Find the equivalent Imperial thermal resistance while retaining the SI and Celsius-based values for reference.

How to use

Enter 0.5 as the value, select K/W as the input unit, choose °F·h/BTU (IT) as the output unit, and set 6 decimal places.

inputUnit: K/W; value: 0.5; outputUnit: °F·h/BTU (IT); decimalPlaces: 6

Outcome

The result is approximately 0.263764 °F·h/BTU (IT). The equivalent values are 0.5 K/W and 0.5 °C/W.

2. Convert an LED thermal path to K/W

LED design engineer

Background

An LED thermal path is rated at 10 °F·h/BTU (IT), while the design calculation uses K/W.

Problem

Convert the rating to K/W and confirm the equivalent °C/W value.

How to use

Enter 10 as the value, select °F·h/BTU (IT) as the input unit, choose K/W as the output unit, and set 6 decimal places.

FAQ

Which thermal resistance units are supported?

The converter supports K/W, °C/W, and °F·h/BTU (IT).

Are K/W and °C/W equivalent?

Yes. A temperature difference of 1 K equals a temperature difference of 1 °C, so the numerical values are the same.

How is °F·h/BTU converted to K/W?

One °F·h/BTU (IT) equals 1.8956342 K/W.

Can I enter a negative value?

No. The thermal resistance value must be non-negative.

How many decimal places can the result use?

You can set the result to between 0 and 10 decimal places.

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inputUnit: °F·h/BTU (IT); value: 10; outputUnit: K/W; decimalPlaces: 6

Outcome

The result is approximately 18.956342 K/W. The equivalent °C/W value is also 18.956342.