Convert Watt per Square Foot to Watt per Square Meter
Live bidirectional calculator for Watts per Square Foot (W/ft²) and Watts per Square Meter (W/m²) with verified formula and conversion charts.
Irradiance5 units
How the Calculation Works (Linear Scaling)
Since 1 Watt per Square Foot = 10.76391 Watts per Square Meter, multiply the value in Watts per Square Foot by 10.76391.
Watt per Square Foot to Watt per Square Meter Conversion Table
Precomputed values for quick reference and printing.
| Watt per Square Foot | Watt per Square Meter |
|---|---|
| 1 W/ft² | 10.7639 W/m² |
| 2 W/ft² | 21.5278 W/m² |
| 3 W/ft² | 32.2917 W/m² |
| 4 W/ft² | 43.0556 W/m² |
| 5 W/ft² | 53.8196 W/m² |
| 6 W/ft² | 64.5835 W/m² |
| 7 W/ft² | 75.3474 W/m² |
| 8 W/ft² | 86.1113 W/m² |
| 9 W/ft² | 96.8752 W/m² |
| 10 W/ft² | 107.6391 W/m² |
| 15 W/ft² | 161.4587 W/m² |
| 20 W/ft² | 215.2782 W/m² |
| 25 W/ft² | 269.0978 W/m² |
| 30 W/ft² | 322.9173 W/m² |
| 40 W/ft² | 430.5564 W/m² |
| 50 W/ft² | 538.1955 W/m² |
| 75 W/ft² | 807.2933 W/m² |
| 100 W/ft² | 1076.391 W/m² |
| Watt per Square Meter | Watt per Square Foot |
|---|---|
| 1 W/m² | 0.0929 W/ft² |
| 2 W/m² | 0.1858 W/ft² |
| 3 W/m² | 0.2787 W/ft² |
| 4 W/m² | 0.3716 W/ft² |
| 5 W/m² | 0.4645 W/ft² |
| 6 W/m² | 0.5574 W/ft² |
| 7 W/m² | 0.6503 W/ft² |
| 8 W/m² | 0.7432 W/ft² |
| 9 W/m² | 0.8361 W/ft² |
| 10 W/m² | 0.929 W/ft² |
| 15 W/m² | 1.3935 W/ft² |
| 20 W/m² | 1.8581 W/ft² |
| 25 W/m² | 2.3226 W/ft² |
| 30 W/m² | 2.7871 W/ft² |
| 40 W/m² | 3.7161 W/ft² |
| 50 W/m² | 4.6452 W/ft² |
| 75 W/m² | 6.9677 W/ft² |
| 100 W/m² | 9.2903 W/ft² |
About Watt per Square Foot (W/ft²)
A US customary unit of irradiance equal to approximately 10.7639104 W/m² (1 W / 0.09290304 m²).
History: Derived from American engineering definitions for radiant thermal flux and architectural solar loading.
Common Uses: Building envelope solar heat gain analysis, greenhouse radiant heating calculations.
About Watt per Square Meter (W/m²)
The SI coherent derived unit of radiant flux received by a surface per unit area (1 W/m²). Distinct from photometric illuminance (lux) as it integrates across all optical wavelengths without human eye photopic weighting.
History: Standardized in SI radiometry; fundamental metric for the solar constant (~1,361 W/m² at top of atmosphere).
Common Uses: Meteorology, solar power plant pyranometer sensors, UV index monitoring, radiative heating.
❓ Frequently Asked Questions
How many Watts per Square Meter are in 1 Watt per Square Foot?
There are exactly 10.76391 Watts per Square Meter in 1 Watt per Square Foot (1 W/ft² = 10.76391 W/m²).
What is the formula to convert Watt per Square Foot to Watt per Square Meter?
The formula is: Watt per Square Meter = Watt per Square Foot × 10.76391. Since 1 Watt per Square Foot = 10.76391 Watts per Square Meter, multiply the value in Watts per Square Foot by 10.76391.
How do I convert 1 W/ft² to W/m² manually?
To convert 1 W/ft² to W/m²: apply the formula Watt per Square Meter = Watt per Square Foot × 10.76391. Substituting gives: 1 × 10.76391 = 10.7639 W/m².