Heat Flux Density Converter - Convert W/m², BTU/h·ft², cal/s·cm² & More

Result:

1000 W/m² = 316.9984055 BTU/h·ft²

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How Heat Flux Density Conversion Works

1

Input Flux

Enter heat flux value

2

Select Units

Choose flux units

3

Convert

Apply flux formula

q₂ = q₁ × (f₁/f₂)
Heat flux conversion formula

Conversion Formulas

W/m² to BTU/h·ft²

BTU/h·ft² = W/m² ÷ 3.15459

Example: 1000 W/m² = 1000 ÷ 3.15459 = 317.0 BTU/h·ft²

W/m² to cal/s·cm²

cal/s·cm² = W/m² ÷ 41868

Example: 1000 W/m² = 1000 ÷ 41868 = 0.0239 cal/s·cm²

kW/m² to W/m²

W/m² = kW/m² × 1000

Example: 5 kW/m² = 5 × 1000 = 5000 W/m²

kcal/h·m² to W/m²

W/m² = kcal/h·m² × 1.163

Example: 500 kcal/h·m² = 500 × 1.163 = 581.5 W/m²

Heat Flux Density Conversion Table

W/m²kW/m²BTU/h·ft²cal/s·cm²kcal/h·m²
1000.131.70.002486
2500.379.20.0060215
5000.5158.50.0119430
7500.8237.70.0179645
10001.0317.00.0239860
15001.5475.50.03581290
20002.0634.00.04781720
25002.5792.50.05972150
30003.0951.00.07172580
40004.01268.00.09553439
50005.01585.00.11944299
75007.52377.50.17916449
1000010.03170.00.23888598
1500015.04755.00.358312898
2000020.06340.00.477717197

Heat Flux Units Progression Chart

100 W/m²

BTU/h·ft²:31.7
cal/s·cm²:0.0024

500 W/m²

BTU/h·ft²:158.5
cal/s·cm²:0.0119

1000 W/m²

BTU/h·ft²:317.0
cal/s·cm²:0.0239

2000 W/m²

BTU/h·ft²:634.0
cal/s·cm²:0.0478

5000 W/m²

BTU/h·ft²:1585.0
cal/s·cm²:0.1194

10000 W/m²

BTU/h·ft²:3170.0
cal/s·cm²:0.2389

Practice Problems

Problem 1:

Convert 2500 W/m² to BTU/h·ft²

Solution: 2500 ÷ 3.15459 = 792.5 BTU/h·ft²

Problem 2:

Convert 500 BTU/h·ft² to W/m²

Solution: 500 × 3.15459 = 1577.3 W/m²

Problem 3:

Convert 0.05 cal/s·cm² to W/m²

Solution: 0.05 × 41868 = 2093.4 W/m²

Problem 4:

Convert 8 kW/m² to BTU/h·ft²

Solution: (8 × 1000) ÷ 3.15459 = 2536.0 BTU/h·ft²

Problem 5:

Convert 1200 kcal/h·m² to kW/m²

Solution: (1200 × 1.163) ÷ 1000 = 1.396 kW/m²

What is Heat Flux Density?

Heat flux density is the amount of heat energy that flows through a surface area in a given time. Think of it like measuring how much heat passes through a window or wall. We measure heat flux density in units like W/m² (watts per square meter), BTU/h·ft² (British thermal units per hour per square foot), and cal/s·cm² (calories per second per square centimeter).

Our heat flux density converter helps you change between different units easily. Whether you work with thermal flux, power density, or energy flux, this tool makes conversions simple and fast. You can convert W/m² to BTU/h·ft², cal/s·cm² to kW/m², or any other heat transfer rate units you need.

Heat flux density is important in many areas. Engineers use it to design heating systems. Scientists study it in climate research. Builders use it to check insulation. Solar panel makers need it to measure energy output. Our converter makes these calculations quick and accurate.

How Heat Flux Density Works

Heat flux density shows how fast heat moves through a surface. When you touch a hot stove, heat flows from the stove to your hand. The heat flux density tells us how much heat energy passes through each square meter or square foot of surface every second or hour.

Different countries and industries use different units for heat flux density. In science, we often use W/m² (watts per square meter). In building design, people might use BTU/h·ft² (British thermal units per hour per square foot). Our heat flux density converter lets you switch between all these units easily.

The thermal flux converter uses simple math to change units. Each unit has a conversion factor. For example, 1 W/m² equals about 0.317 BTU/h·ft². Our tool does this math for you automatically, so you get accurate results every time.

Common Heat Flux Density Examples

Solar Energy

Sunlight on Earth: 1000-1200 W/m²

Solar panel output: 150-200 W/m²

Solar cooker: 500-800 W/m²

Building Heat Loss

Good wall insulation: 20-40 W/m²

Poor insulation: 100-200 W/m²

Single glass window: 200-400 W/m²

Industrial Heat

Furnace wall: 5000-15000 W/m²

Steam boiler: 50000-100000 W/m²

Heat exchanger: 10000-50000 W/m²

Electronics

Computer CPU: 500-1500 W/m²

LED light: 100-300 W/m²

Phone battery: 50-150 W/m²

Why Use Our Heat Flux Density Converter?

Fast Results

Get instant heat flux density conversions. No waiting, no delays. Just enter your value and see results right away.

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Accurate Math

Our thermal flux converter uses precise formulas. Every conversion is checked for accuracy. Trust our results for your work.

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Easy to Use

Simple design that works on phones, tablets, and computers. No downloads needed. Use it anywhere, anytime.

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Many Units

Convert between W/m², BTU/h·ft², cal/s·cm², kW/m², and more. All the power density units you need in one place.

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Free Tool

No cost to use our heat transfer rate converter. No sign-up required. Free for students, engineers, and everyone.

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Extra Features

Get conversion tables, charts, and examples. Learn while you convert. Perfect for homework and work projects.

Frequently Asked Questions

What is heat flux density used for?

Heat flux density measures how much heat energy flows through a surface area. Engineers use it to design heating systems, check insulation, and study heat transfer. It helps in solar panel design, building energy efficiency, and industrial heating processes.

How do I convert W/m² to BTU/h·ft²?

To convert W/m² to BTU/h·ft², divide the W/m² value by 3.15459. For example, 1000 W/m² ÷ 3.15459 = 317.0 BTU/h·ft². Our heat flux density converter does this math automatically for you.

What is the difference between heat flux and power density?

Heat flux density and power density are very similar. Both measure energy per unit area per time. Heat flux focuses on thermal energy, while power density can include any type of energy. In most cases, you can use our converter for both.

Is this thermal flux converter accurate?

Yes, our thermal flux converter uses standard conversion factors from engineering references. All calculations are double-checked for accuracy. The results match what you would get from engineering handbooks and scientific calculators.

Can I use this for energy flux calculations?

Yes, our tool works for energy flux conversions too. Energy flux and heat flux density use the same units and conversion factors. Whether you call it thermal flux, heat flux, power density, or energy flux, our converter handles it all.

Daily Uses of Heat Flux Density

Solar panel efficiency calculations and energy output estimation

Building insulation performance and thermal bridge analysis

Heat exchanger design and thermal equipment sizing

Electronic cooling system design for circuit boards

Meteorology and climate studies for radiation measurements

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Quick Reference

📏1 meter
3.28 feet
⚖️1 kilogram
2.2 pounds
🌡️0°C
32°F
🥤1 liter
0.26 gallon