Convert BTU per Hour-Square Foot to Kilowatts per Square Meter
Instantly convert BTU per Hour-Square Foot (BTU/(hr·ft²)) to Kilowatts per Square Meter (kW/m²) with our free online calculator.
Formula: BTU/(hr·ft²) to kW/m² — multiply by 0.00315459
Reference Table
| BTU per Hour-Square Foot (BTU/(hr·ft²)) | Kilowatts per Square Meter (kW/m²) |
|---|---|
| 1 | 0.00315459 |
| 5 | 0.0157729 |
| 10 | 0.0315459 |
| 25 | 0.0788647 |
| 50 | 0.157729 |
| 100 | 0.315459 |
How to Convert BTU per Hour-Square Foot to Kilowatts per Square Meter
Formula
To convert BTU per Hour-Square Foot (BTU/(hr·ft²)) to Kilowatts per Square Meter (kW/m²): multiply by 0.00315459
Step-by-Step
- Start with your value in BTU per Hour-Square Foot (BTU/(hr·ft²)).
- Multiply by 0.00315459 to perform the conversion.
- The result is your value expressed in Kilowatts per Square Meter (kW/m²).
Conversion Factor
1 BTU/(hr·ft²) = 0.00315459 kW/m²
Reverse Factor
1 kW/m² = 316.998 BTU/(hr·ft²)
Worked Example
Convert 25 BTU per Hour-Square Foot to Kilowatts per Square Meter: 25 BTU/(hr·ft²) = 0.0788647 kW/m²
About BTU per Hour-Square Foot (BTU/(hr·ft²))
An imperial heat-flux unit used in US HVAC, building-envelope analysis, and heat-exchanger design. ASHRAE design loads, solar heat-gain tables for windows, and HVAC equipment ratings commonly use BTU/(hr·ft²). Common peak solar heat gain through a south-facing window might be 200–300 BTU/(hr·ft²). 1 BTU/(hr·ft²) ≈ 3.155 W/m².
About Kilowatt per Square Meter (kW/m²)
A heat-flux unit equal to 1,000 W/m². Used for high-intensity contexts: combustion chamber walls, rocket-nozzle regenerative cooling (can exceed 50 MW/m²), industrial furnace interiors, and concentrated-solar receivers. Also appears in fire protection engineering, where radiant heat exposure from flames is quoted in kW/m² (a human can tolerate ~2 kW/m² for sustained exposure).
Quick Facts
- 1 BTU per Hour-Square Foot equals 0.00315459 Kilowatts per Square Meter
- 1 Kilowatt per Square Meter equals 316.998 BTU per Hour-Square Foot
- BTU per Hour-Square Foot is a unit of heat flux
- Kilowatt per Square Meter is a unit of heat flux
- This conversion is commonly used in fire protection engineering, electronics cooling, and solar energy
- The BTU per Hour-Square Foot belongs to the imperial system
- The Kilowatt per Square Meter belongs to the metric system
Common BTU per Hour-Square Foot to Kilowatt per Square Meter Conversions
| BTU per Hour-Square Foot (BTU/(hr·ft²)) | Kilowatts per Square Meter (kW/m²) |
|---|---|
| 0.01 | 0.0000315459 |
| 0.1 | 0.000315459 |
| 0.25 | 0.000788647 |
| 0.5 | 0.00157729 |
| 1 | 0.00315459 |
| 2 | 0.00630918 |
| 3 | 0.00946377 |
| 5 | 0.0157729 |
| 10 | 0.0315459 |
| 15 | 0.0473188 |
| 20 | 0.0630918 |
| 25 | 0.0788647 |
| 50 | 0.157729 |
| 75 | 0.236594 |
| 100 | 0.315459 |
| 250 | 0.788647 |
| 500 | 1.57729 |
| 1000 | 3.15459 |
| 5000 | 15.7729 |
| 10000 | 31.5459 |
Understanding BTU per Hour-Square Foot
The BTU per Hour-Square Foot (symbol: BTU/(hr·ft²)) is a unit of heat flux. An imperial heat-flux unit used in US HVAC, building-envelope analysis, and heat-exchanger design. ASHRAE design loads, solar heat-gain tables for windows, and HVAC equipment ratings commonly use BTU/(hr·ft²). Common peak solar heat gain through a south-facing window might be 200–300 BTU/(hr·ft²). 1 BTU/(hr·ft²) ≈ 3.155 W/m².
It belongs to the imperial measurement system.
BTU per Hour-Square Foot are commonly used in fire protection engineering, electronics cooling, and solar energy.
Understanding Kilowatts per Square Meter
The Kilowatt per Square Meter (symbol: kW/m²) is a unit of heat flux. A heat-flux unit equal to 1,000 W/m². Used for high-intensity contexts: combustion chamber walls, rocket-nozzle regenerative cooling (can exceed 50 MW/m²), industrial furnace interiors, and concentrated-solar receivers. Also appears in fire protection engineering, where radiant heat exposure from flames is quoted in kW/m² (a human can tolerate ~2 kW/m² for sustained exposure).
It belongs to the metric measurement system.
Kilowatts per Square Meter are commonly used in fire protection engineering, electronics cooling, and solar energy.
Why Convert BTU per Hour-Square Foot to Kilowatts per Square Meter?
Converting between BTU per Hour-Square Foot and Kilowatts per Square Meter is a frequent requirement for engineers, scientists, and students working with heat flux values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate heat flux conversion is essential.
Frequently Asked Questions
How do I convert BTU per Hour-Square Foot to Kilowatts per Square Meter?
An imperial heat-flux unit used in US HVAC, building-envelope analysis, and heat-exchanger design. To convert BTU per Hour-Square Foot to Kilowatts per Square Meter, multiply by 0.00315459. For example, 25 BTU/(hr·ft²) equals 0.0788647 kW/m².
How many Kilowatts per Square Meter are in 1 BTU per Hour-Square Foot?
There are 0.00315459 Kilowatts per Square Meter in 1 BTU per Hour-Square Foot.
How many BTU per Hour-Square Foot are in 1 Kilowatt per Square Meter?
There are 316.998 BTU per Hour-Square Foot in 1 Kilowatt per Square Meter.
What is the formula for BTU per Hour-Square Foot to Kilowatt per Square Meter conversion?
The formula is: multiply by 0.00315459. This means 1 BTU/(hr·ft²) = 0.00315459 kW/m².
Is a BTU per Hour-Square Foot bigger than a Kilowatt per Square Meter?
Yes. One BTU per Hour-Square Foot is larger than one Kilowatt per Square Meter because 1 BTU/(hr·ft²) equals 0.00315459 kW/m², which is less than 1.
When do you need to convert between BTU per Hour-Square Foot and Kilowatts per Square Meter?
A heat-flux unit equal to 1,000 W/m². BTU per Hour-Square Foot and Kilowatt per Square Meter are both heat flux units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.