Heat Flux Density / W/m² → Btu IT/(h·ft²)
Convert Watts per square meter to Btu IT per hour square foot
Convert heat-transfer power per unit area. Convert Watts per square meter (W/m²) to Btu IT per hour square foot (Btu IT/(h·ft²)). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Btu IT per hour square foot to Watts per square meter →
How to convert watts per square meter to Btu IT per hour square foot
Heat flux density is power per area, W/m². A positive or negative sign can indicate direction under the chosen sign convention; this tool preserves that sign.
Use x for the value in W/m², b for the intermediate value in W/m², and y for the result in Btu IT/(h·ft²).
Btu IT/(h·ft²) = W/m² ÷ 3.1545907450630484
Worked examples
10 W/m² ≈ 3.16998330628 Btu IT/(h·ft²)
Step 1: (10 × 1) ≈ 10 W/m².
Step 2: 10 ÷ 3.15459074506 ≈ 3.16998330628 Btu IT/(h·ft²).20 W/m² ≈ 6.33996661256 Btu IT/(h·ft²)
Step 1: (20 × 1) ≈ 20 W/m².
Step 2: 20 ÷ 3.15459074506 ≈ 6.33996661256 Btu IT/(h·ft²).
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Watts per square meter
Watts per square meter (W/m²) measures heat flux density under the conventions above. The base value in W/m² is (x × 1), where x is the numerical value in W/m². Factors shown here are rounded for display; calculations use the stored factor.
About Btu IT per hour square foot
Btu IT per hour square foot (Btu IT/(h·ft²)) measures heat flux density under the conventions above. The base value in W/m² is (x × 3.15459074506), where x is the numerical value in Btu IT/(h·ft²). Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Watts per square meter to Btu IT per hour square foot reference table
| Watts per square meter (W/m²) | Btu IT per hour square foot (Btu IT/(h·ft²)) |
|---|---|
| 1 | 0.316998330628 |
| 5 | 1.58499165314 |
| 10 | 3.16998330628 |
| 25 | 7.9249582657 |
| 50 | 15.8499165314 |
| 100 | 31.6998330628 |
| 1000 | 316.998330628 |
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