BTU/hour·square feet to Watt/square meters (BTU/h·ft² to W/m²)
Free online btu/hour·square foot to watt/square meter 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 btu/hour·square foot value by 3.15459075 — i.e. W/m² = BTU/h·ft² × 3.15459075
Quick check: 1 BTU/h·ft² = 3.15459075 W/m²
Quick check: 1 BTU/h·ft² = 3.15459075 W/m²
BTU/hour·square feet to Watt/square meters conversion table
| BTU/hour·square feet (BTU/h·ft²) | Watt/square meters (W/m²) |
|---|---|
| 1 BTU/h·ft² | 3.15459075 W/m² |
| 2 BTU/h·ft² | 6.30918149 W/m² |
| 3 BTU/h·ft² | 9.46377224 W/m² |
| 4 BTU/h·ft² | 12.61836298 W/m² |
| 5 BTU/h·ft² | 15.77295373 W/m² |
| 6 BTU/h·ft² | 18.92754447 W/m² |
| 7 BTU/h·ft² | 22.08213522 W/m² |
| 8 BTU/h·ft² | 25.23672596 W/m² |
| 9 BTU/h·ft² | 28.39131671 W/m² |
| 10 BTU/h·ft² | 31.54590745 W/m² |
| 15 BTU/h·ft² | 47.31886118 W/m² |
| 20 BTU/h·ft² | 63.0918149 W/m² |
| 25 BTU/h·ft² | 78.86476863 W/m² |
| 30 BTU/h·ft² | 94.63772235 W/m² |
| 40 BTU/h·ft² | 126.1836298 W/m² |
| 50 BTU/h·ft² | 157.72953725 W/m² |
| 75 BTU/h·ft² | 236.59430588 W/m² |
| 100 BTU/h·ft² | 315.45907451 W/m² |
| 250 BTU/h·ft² | 788.64768628 W/m² |
| 500 BTU/h·ft² | 1,577.29537255 W/m² |
| 1,000 BTU/h·ft² | 3,154.5907451 W/m² |
How to convert btu/hour·square feet to watt/square meters
To convert btu/hour·square feet to watt/square meters, multiply the amount in btu/hour·square feet by 3.15459075. For example, 10 BTU/h·ft² = 31.54590745 W/m². 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 watt/square meters are in one btu/hour·square foot?
One btu/hour·square foot is exactly 3.15459075 watt/square meters.
How do I convert BTU/h·ft² to W/m²?
Multiply the BTU/h·ft² value by 3.15459075 to get W/m². The converter at the top of this page does this automatically and works in both directions.
How much is 100 btu/hour·square feet in watt/square meters?
100 btu/hour·square feet equals 315.45907451 watt/square meters.