Which units does this converter support?

It converts between W/(m²·K) and kcal/(m²·h·°C).

What does the heat transfer coefficient represent?

It is the convective surface or film coefficient, commonly written as h.

Can I enter a negative value?

No. The value must be non-negative.

What conversion factor is used?

1 kcal/(m²·h·°C) equals 1.1627778 W/(m²·K).

Does the converter determine the correct h value for a material?

No. The heat transfer coefficient depends on the flow regime and surface, not only on the material.

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Heat Transfer Coefficient Converter (W/(m²·K) ↔ kcal)

Convert convective heat transfer coefficient (film coefficient h) between W/(m²·K) (watt per square metre-kelvin, SI base, = W/(m²·°C)) and kcal/(m²·h·°C) (1 = 1.1627778 W/(m²·K)). Converts via W/(m²·K) and lists both equivalents. h depends on flow regime and surface, not material. Typical ranges: natural-convection air ≈ 5–25, forced air ≈ 25–250, still water ≈ 100–1000, boiling/condensing water ≈ 2500–50000+ W/(m²·K).

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2 examples

Forced air: 50 W/(m²·K) → kcal ≈ 43.0005

50 W/(m²·K) ÷ 1.1627777778 = 43.0005 kcal/(m²·h·°C). Typical forced-convection air over a finned surface.

{"result":"50 W/(m²·K) = 43.000479 kcal/(m²·h·°C). All units: W/(m²·K)=50, kcal/(m²·h·°C)=43.000479.","metadata":{"input":{"inputUnit":"W/(m²·K)","value":50,"outputUnit":"kcal/(m²·h·°C)"},"result":{"outputValue":43.000479,"outputUnit":"kcal/(m²·h·°C)","Wm2K":50,"kcal":43.000479}}}

Boiling water: 5000 kcal/(m²·h·°C) → W/(m²·K) ≈ 5813.889

5000 kcal/(m²·h·°C) × 1.1627777778 = 5813.889 W/(m²·K). High-h regime of nucleate boiling / steam condensation.

{"result":"5000 kcal/(m²·h·°C) = 5813.888889 W/(m²·K). All units: W/(m²·K)=5813.888889, kcal/(m²·h·°C)=5000.","metadata":{"input":{"inputUnit":"kcal/(m²·h·°C)","value":5000,"outputUnit":"W/(m²·K)"},"result":{"outputValue":5813.888889,"outputUnit":"W/(m²·K)","Wm2K":5813.888889,"kcal":5000}}}

Inputs

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4 options

SettingsAdjust formats, ranges, numbers, and modes.4

Input unitselectOptionalValuenumberRequiredHeat transfer coefficient in the selected Input unit. Must be non-negative.Output unitselectOptionalDecimal PlacesnumberOptional

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Heat Transfer Coefficient Converter (W/(m²·K) ↔ kcal)

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Use cases

Examples

1. Forced-air coefficient conversion

2. Boiling-water coefficient conversion

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