Heat Flux Density Converter
Quick answer: Choose a starting unit and a target unit, then enter a value. Common conversions: 1 W/m² = 0.001 kW/m²; 1 W/m² = 0.3169983 Btu/(h·ft²); 1 W/m² = 0.0001 W/cm². This converter covers 7 heat flux density units.
- Calculator
- Formula
- Examples
- Step by step
- Popular conversions
- Reading your result
- Mistakes
- FAQ
- Related tools
- Method
Use the Heat Flux Density Converter
Heat Flux Density formula and what each symbol means
target = value × (factor of starting unit ÷ factor of target unit), where each factor is the unit value in W/m².
| Symbol | Meaning |
|---|---|
| value | The number you want to convert |
| factor | The unit’s size expressed in the base unit (W/m²) |
Heat Flux Density examples
W/m² to kW/m²
10 W/m² = 0.01 kW/m².
W/m² to Btu/(h·ft²)
10 W/m² = 3.169983 Btu/(h·ft²).
W/m² to W/cm²
10 W/m² = 0.001 W/cm².
How to calculate Heat Flux Density step by step
- Choose the starting unit and the target unit.
- Enter your value.
- Read the converted value, plus the conversion factor in both directions.
Popular heat flux density conversions
- Watts per square meter to Kilowatts per square meter converter
- Watts per square meter to Btu per hour square foot converter
- Watts per square meter to Watts per square centimeter converter
- Kilowatts per square meter to Watts per square meter converter
- Kilowatts per square meter to Btu per hour square foot converter
- Kilowatts per square meter to Watts per square centimeter converter
- Btu per hour square foot to Watts per square meter converter
- Btu per hour square foot to Kilowatts per square meter converter
- Btu per hour square foot to Watts per square centimeter converter
- Watts per square centimeter to Watts per square meter converter
- Watts per square centimeter to Kilowatts per square meter converter
- Watts per square centimeter to Btu per hour square foot converter
How to read your Heat Flux Density result
Heat flux density is heat flow per unit area. The SI unit is watt per square metre. Sunlight above the atmosphere averages about 1,361 W/m², and 1 Btu/(h·ft²) is about 3.1546 W/m².
| UNIT | SYMBOL | EQUALS | VALUE OF 1 W/M² |
|---|---|---|---|
| Watt per square meter | W/m² | 1 W/m² = 1 W/m² | 1 W/m² |
| Kilowatt per square meter | kW/m² | 1 kW/m² = 1,000 W/m² | 0.001 kW/m² |
| Watt per square centimeter | W/cm² | 1 W/cm² = 10,000 W/m² | 0.0001 W/cm² |
| Calorie per second square centimeter | cal/(s·cm²) | 1 cal/(s·cm²) = 41,840 W/m² | 0.00002390057 cal/(s·cm²) |
| Kilocalorie per hour square meter | kcal/(h·m²) | 1 kcal/(h·m²) = 1.1622222 W/m² | 0.8604207 kcal/(h·m²) |
| Btu per hour square foot | Btu/(h·ft²) | 1 Btu/(h·ft²) = 3.1545907 W/m² | 0.3169983 Btu/(h·ft²) |
| Btu per second square foot | Btu/(s·ft²) | 1 Btu/(s·ft²) = 11,356.527 W/m² | 0.00008805509 Btu/(s·ft²) |
Common mistakes when calculating Heat Flux Density
- Mixing W/cm² with W/m²: the first is 10,000 times larger.
- Confusing heat flux (W/m²) with total heat flow (W).
- Forgetting that Btu/(h·ft²) includes both a time and an area.
Heat Flux Density FAQ
How many W/m² is 1 W/cm²?
Exactly 10,000 W/m².
How many W/m² is 1 Btu/(h·ft²)?
About 3.1546 W/m².
How do I get total heat flow from heat flux?
Multiply the heat flux density by the area, so 100 W/m² over 2 m² is 200 W.
What is the base unit for heat flux density?
This converter uses watt per square meter (W/m²) as the common base unit: every value is first converted to it and then to the target unit.
How do I convert between two heat flux density units?
Choose the starting and target units, enter the value and read the result. By hand: convert to the base unit with the table, then divide by the target unit factor.
How many kilowatts per square meter are in 1 watt per square meter?
1 W/m² = 0.001 kW/m².
How many btu per hour square foot are in 1 watt per square meter?
1 W/m² = 0.3169983 Btu/(h·ft²).
How many watts per square centimeter are in 1 watt per square meter?
1 W/m² = 0.0001 W/cm².
Which heat flux density units does this converter support?
It covers 7 units: watt per square meter (W/m²), kilowatt per square meter (kW/m²), watt per square centimeter (W/cm²), calorie per second square centimeter (cal/(s·cm²)), kilocalorie per hour square meter (kcal/(h·m²)), btu per hour square foot (Btu/(h·ft²)), btu per second square foot (Btu/(s·ft²)).
How accurate is the heat flux density converter?
Results are calculated at full double precision and shown to about 8 significant figures. Round the answer to the precision of your original measurement; a result cannot be more accurate than the number you started with.
More in Heat Flux Density converters
- Kilowatts per square meter to Btu per hour square foot Converter
- Btu per hour square foot to Watts per square meter Converter
- Kilowatts per square meter to Watts per square centimeter Converter
- Btu per hour square foot to Watts per square centimeter Converter
- Kilowatts per square meter to Watts per square meter Converter
- Btu per hour square foot to Kilowatts per square meter Converter
See all heat flux density converters tools · All Conversion calculators · Site map
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)