Watts per square meter to Btu per hour square foot Converter
Quick answer: To convert watts per square meter to btu per hour square foot, multiply by 0.3169983. For example, 10 W/m² is 3.169983 Btu/(h·ft²). One watt per square meter equals 0.3169983 Btu/(h·ft²).
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Use the Watts per square meter to Btu per hour square foot Converter
Watts per square meter to Btu per hour square foot formula and what each symbol means
Btu/(h·ft²) = W/m² × 0.3169983
| Symbol | Meaning |
|---|---|
| W/m² | Watt per square meter |
| Btu/(h·ft²) | Btu per hour square foot |
Watts per square meter to Btu per hour square foot examples
1 W/m²
1 W/m² × 0.3169983 = 0.3169983 Btu/(h·ft²).
10 W/m²
10 W/m² × 0.3169983 = 3.169983 Btu/(h·ft²).
100 W/m²
100 W/m² × 0.3169983 = 31.69983 Btu/(h·ft²).
Watts per square meter compared with Btu per hour square foot
One Btu/(h·ft²) is 3.155 times as large as one W/m², so your number gets smaller when you convert watts per square meter to btu per hour square foot and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About watts per square meter and btu per hour square foot
Watt per square meter (W/m²): The SI unit of heat flux density. Btu per hour square foot (Btu/(h·ft²)): A US customary unit, about 3.1546 W/m².
How to calculate Watts per square meter to Btu per hour square foot step by step
- Enter the value in W/m² (the starting unit).
- Multiply by 0.3169983, because 1 W/m² = 0.3169983 Btu/(h·ft²).
- The product is the value in Btu/(h·ft²). To go back, divide by 0.3169983 or multiply by 3.154591.
Popular heat flux density conversions
- Watts per square meter to Kilowatts per square meter converter
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How to read your Watts per square meter to Btu per hour square foot result
Quick estimate: multiply by about 0.32 to get btu per hour square foot from watts per square meter; this is within 1.0% of the exact factor. Sunlight above the atmosphere averages about 1,361 W/m², and 1 Btu/(h·ft²) is about 3.1546 W/m².
| WATTS PER SQUARE METER | BTU PER HOUR SQUARE FOOT |
|---|---|
| 1 | 0.3169983 |
| 2 | 0.6339967 |
| 5 | 1.584992 |
| 10 | 3.169983 |
| 20 | 6.339967 |
| 50 | 15.84992 |
| 100 | 31.69983 |
| 1,000 | 316.9983 |
Btu per hour square foot to Watts per square meter: quick table
| BTU PER HOUR SQUARE FOOT | WATTS PER SQUARE METER |
|---|---|
| 1 | 3.154591 |
| 5 | 15.77295 |
| 10 | 31.54591 |
| 25 | 78.86477 |
| 50 | 157.7295 |
| 100 | 315.4591 |
| 250 | 788.6477 |
| 500 | 1,577.295 |
Common mistakes when calculating Watts per square meter to Btu per hour square foot
- Forgetting that Btu/(h·ft²) includes both a time and an area.
- Dividing when you should multiply: from W/m² to Btu/(h·ft²) multiply by 0.3169983; from Btu/(h·ft²) to W/m² divide by 0.3169983.
Watts per square meter to Btu per hour square foot FAQ
How many Btu/(h·ft²) are in 1 W/m²?
1 W/m² equals 0.3169983 Btu/(h·ft²).
How many W/m² are in 1 Btu/(h·ft²)?
1 Btu/(h·ft²) equals 3.154591 W/m².
Is 1 W/m² = 0.3169983 Btu/(h·ft²) an exact conversion?
The factor is shown rounded to 7 significant figures (0.3169983). The calculator above uses more digits.
What is a btu per hour square foot (Btu/(h·ft²))?
A US customary unit, about 3.1546 W/m².
How can I estimate watts per square meter to btu per hour square foot in my head?
Quick estimate: multiply by about 0.32 to get btu per hour square foot from watts per square meter; this is within 1.0% of the exact factor.
What is 0.5 W/m² in btu per hour square foot?
0.5 W/m² = 0.1584992 Btu/(h·ft²) (since 0.5 × 0.3169983).
What is 25 W/m² in btu per hour square foot?
25 W/m² = 7.924958 Btu/(h·ft²) (since 25 × 0.3169983).
What is 80 W/m² in btu per hour square foot?
80 W/m² = 25.35987 Btu/(h·ft²) (since 80 × 0.3169983).
How many decimals should I keep when converting W/m² to Btu/(h·ft²)?
Match the precision of your original measurement. For example, 3.169983 Btu/(h·ft²) rounds to 3.17 Btu/(h·ft²) at 3 significant figures; keep more digits only for engineering or scientific work.
More in Heat Flux Density converters
- Btu per hour square foot to Kilowatts per square meter Converter
- Watts per square centimeter to Btu per hour square foot Converter
- Btu per hour square foot to Watts per square centimeter Converter
- Kilowatts per square meter to Watts per square meter Converter
- Kilowatts per square meter to Watts per square centimeter Converter
- Kilowatts per square meter to Btu per hour square foot Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the International System of Units (SI)