Why convert between Btu (th) and Btu (IT) per second per square foot?

Conversion ensures consistent comparison and reporting of heat flux density values measured using different British thermal unit definitions applied in engineering and fire testing.

Are these units used internationally?

Both units are Imperial and non-SI; for international standardization, SI unit conversions are often preferred.

Is the conversion exact?

No, the conversion factor is close but not exact. The slight difference reflects different energy definitions between thermochemical and International Table Btu units.

How to Convert from Btu (th)/second/square foot to Btu (IT)/second/square foot?

Learn how to accurately convert heat flux density measurements from Btu (thermochemical) per second per square foot to Btu (International Table) per second per square foot with this easy-to-use unit conversion guide.

Btu (th)/second/square foot

Btu (IT)/second/square foot

Please check your input. It must be a valid numeric value.

Btu (th)/second/square foot to Btu (IT)/second/square foot Conversion Table

Btu (th)/second/square foot	Btu (IT)/second/square foot

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Btu (th)/second/square foot to Btu (IT)/second/square foot Conversion Table
Btu (th)/second/square foot	Btu (IT)/second/square foot

Explore More Heat Flux Density Units Converter

What Is This Tool?

This tool converts heat flux density values from Btu (thermochemical) per second per square foot to Btu (International Table) per second per square foot. It helps compare thermal power per area measurements using different British thermal unit standards commonly applied in engineering, fire testing, and material evaluation.

How to Use This Tool?

Enter the heat flux density value in Btu (th)/second/square foot.
Select Btu (IT)/second/square foot as the target unit.
Click the convert button to get the equivalent value.
Review the conversion result reflecting the close equivalence between units.
Use the converted value for engineering or testing documentation.

Key Features

Converts heat flux density between two Imperial unit standards of Btu per second per square foot.
Supports applications in HVAC, building science, fire testing, and thermal materials research.
Includes clear examples demonstrating accurate unit conversion.
Browser-based and easy to use without additional software.
Ensures consistent reporting of heat transfer measurements across unit standards.

Examples

10 Btu (th)/second/square foot converts to 9.993312315 Btu (IT)/second/square foot.
5 Btu (th)/second/square foot converts to 4.9966561575 Btu (IT)/second/square foot.

Common Use Cases

Calculating heat transfer through building envelopes and insulation using Imperial units.
Quantifying radiative or convective heat loads on equipment or furnace surfaces in thermal designs.
Evaluating surface heat flux during fire exposure and material flammability testing.
Reporting elevated radiative heat fluxes in fire resistance and materials testing labs.
Specifying localized heat loads in high-temperature furnace, laser, or plasma heating scenarios.

Tips & Best Practices

Always verify which Btu unit standard is used in your heat flux measurements.
Use this conversion to ensure consistency between thermochemical and International Table Btu values.
Consider the slight difference between units when precision is critical in measurements.
Complement with SI unit conversions for international standard compliance.
Apply conversions carefully in fire testing and thermal protection material analyses.

Limitations

The conversion factor is close but not exact; small discrepancies may exist in sensitive calculations.
Both units are Imperial and non-SI, so use SI conversions where international standards apply.
Precision requirements in some measurements may require additional validation beyond this tool.

Frequently Asked Questions

Why convert between Btu (th) and Btu (IT) per second per square foot?: Conversion ensures consistent comparison and reporting of heat flux density values measured using different British thermal unit definitions applied in engineering and fire testing.
Are these units used internationally?: Both units are Imperial and non-SI; for international standardization, SI unit conversions are often preferred.
Is the conversion exact?: No, the conversion factor is close but not exact. The slight difference reflects different energy definitions between thermochemical and International Table Btu units.

Key Terminology

Btu (th)/second/square foot: An Imperial unit representing the rate of heat transfer per area based on thermochemical British thermal units.
Btu (IT)/second/square foot: A non-SI heat flux density unit using International Table British thermal units to express thermal power per unit area.
Heat Flux Density: A measure of the rate of heat energy transfer through a surface per unit area, often expressed in Btu per second per square foot or watts per square meter.

Quick Knowledge Check

What does Btu (th)/second/square foot measure?

Thermal energy transferred per cubic foot per second

Heat flux density as energy transferred per second across one square foot

Power in watts per square meter

Which use case is common for converting Btu (th)/s/ft² to Btu (IT)/s/ft²?

Calculating fluid velocity in ducts

Comparing heat flux measurements from different British thermal unit standards

Measuring sound intensity in building acoustics

What is a limitation of this conversion?

It converts between SI and Imperial units directly

The conversion factor is close but not exactly equivalent

It only works for electrical power units

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