Watt/square meters to BTU/hour·square feet (W/m² to BTU/h·ft²)
Free online watt/square meter to btu/hour·square foot converter. Type a value, get an instant exact result — plus the formula, a ready-made conversion table, and reverse conversion.
HEAT FLUX DENSITY CONVERTER — INSTANT RESULT
Formula: multiply the watt/square meter value by 0.31699833 — i.e. BTU/h·ft² = W/m² × 0.31699833
Quick check: 1 W/m² = 0.31699833 BTU/h·ft²
Quick check: 1 W/m² = 0.31699833 BTU/h·ft²
Watt/square meters to BTU/hour·square feet conversion table
| Watt/square meters (W/m²) | BTU/hour·square feet (BTU/h·ft²) |
|---|---|
| 1 W/m² | 0.31699833 BTU/h·ft² |
| 2 W/m² | 0.63399666 BTU/h·ft² |
| 3 W/m² | 0.95099499 BTU/h·ft² |
| 4 W/m² | 1.26799332 BTU/h·ft² |
| 5 W/m² | 1.58499165 BTU/h·ft² |
| 6 W/m² | 1.90198998 BTU/h·ft² |
| 7 W/m² | 2.21898831 BTU/h·ft² |
| 8 W/m² | 2.53598664 BTU/h·ft² |
| 9 W/m² | 2.85298498 BTU/h·ft² |
| 10 W/m² | 3.16998331 BTU/h·ft² |
| 15 W/m² | 4.75497496 BTU/h·ft² |
| 20 W/m² | 6.33996661 BTU/h·ft² |
| 25 W/m² | 7.92495827 BTU/h·ft² |
| 30 W/m² | 9.50994992 BTU/h·ft² |
| 40 W/m² | 12.67993322 BTU/h·ft² |
| 50 W/m² | 15.84991653 BTU/h·ft² |
| 75 W/m² | 23.7748748 BTU/h·ft² |
| 100 W/m² | 31.69983306 BTU/h·ft² |
| 250 W/m² | 79.24958266 BTU/h·ft² |
| 500 W/m² | 158.49916531 BTU/h·ft² |
| 1,000 W/m² | 316.99833062 BTU/h·ft² |
How to convert watt/square meters to btu/hour·square feet
To convert watt/square meters to btu/hour·square feet, multiply the amount in watt/square meters by 0.31699833. For example, 10 W/m² = 3.16998331 BTU/h·ft². To convert in the other direction, divide by the same factor, or use the ⇄ swap button above.
Convert heat flux density between W/m² and BTU per hour per square foot — used in boiler, HVAC and electronics cooling design.
Frequently asked questions
How many btu/hour·square feet are in one watt/square meter?
One watt/square meter is exactly 0.31699833 btu/hour·square feet.
How do I convert W/m² to BTU/h·ft²?
Multiply the W/m² value by 0.31699833 to get BTU/h·ft². The converter at the top of this page does this automatically and works in both directions.
How much is 100 watt/square meters in btu/hour·square feet?
100 watt/square meters equals 31.69983306 btu/hour·square feet.