How do I convert thermal property units?

Enter your value and the converter calculates equivalents. Thermal units include conductivity (W/m·K), resistance (m²·K/W), and R-values.

What is R-value and U-value?

R-value measures thermal resistance (higher = better insulation). U-value is thermal transmittance (lower = better insulation). U = 1/R.

When are thermal calculations needed?

Thermal calculations are essential for building insulation, HVAC design, heat exchanger sizing, and thermal management in electronics.

Thermal Diffusivity Converter

Free online thermal unit converter.

Convert between all thermal units instantly with accurate results, formulas, and reference tables.

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Last updatedMay 21, 2026How we build & check our tools

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Frequently Asked Questions

Common questions about the Thermal Diffusivity Converter

Thermal conductivity (W/m·K) measures how well a material conducts heat. Higher values mean better heat transfer. Metals are typically 50-400 W/m·K.

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Sources & References

International System of Units (SI): thermal quantities (heat, conductivity)

Thermal quantities (heat, conductivity) is measured in the watt, kelvin and joule. Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.

→Source: NIST — International System of Units (SI)

International System of Units (SI)

Authoritative definitions for thermal quantities (heat, conductivity), from the BIPM SI Brochure (9th edition), the defining reference for the SI.

→Source: BIPM — SI Brochure (9th ed.)

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