Why are there two different Btu units used in this conversion?

The units refer to different standards of the British thermal unit—thermochemical for Btu (th) and International Table for Btu (IT)—which are applied in different heat flux measurement contexts.

Can I use this converter for any heat flux density units?

No, this tool specifically converts between Btu (th)/hour/square foot and Btu (IT)/second/square foot units only.

What applications benefit from converting to Btu (IT)/second/square foot?

High-intensity heat flux scenarios such as fire testing, furnace experiments, and thermal protection material testing utilize Btu (IT)/second/square foot.

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

Learn how to convert heat flux density measurements from Btu (th)/hour/square foot to Btu (IT)/second/square foot using a precise conversion rate, suitable for applications ranging from building science to fire testing.

Btu (th)/hour/square foot

Btu (IT)/second/square foot

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

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

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

Explore More Heat Flux Density Units Converter

What Is This Tool?

This converter helps transform heat flux density values from Btu (th)/hour/square foot, commonly used in building and HVAC contexts, into Btu (IT)/second/square foot, a unit better suited for high-intensity heat flux applications such as fire testing and materials exposure.

How to Use This Tool?

Enter the numeric value in Btu (th)/hour/square foot you want to convert.
Select the starting unit: Btu (th)/hour/square foot.
Choose the target unit: Btu (IT)/second/square foot.
Click the convert button to get the equivalent value.

Key Features

Converts between two specialized heat flux density units.
Uses an exact conversion rate: 1 Btu (th)/hour/square foot equals 0.000277592 Btu (IT)/second/square foot.
Supports applications in building science, HVAC, fire resistance testing, and thermal materials evaluation.
Browser-based interface for quick and easy unit conversion.

Examples

Convert 10 Btu (th)/hour/square foot: 10 × 0.000277592 = 0.00277592 Btu (IT)/second/square foot.
Convert 100 Btu (th)/hour/square foot: 100 × 0.000277592 = 0.0277592 Btu (IT)/second/square foot.

Common Use Cases

Expressing insulation heat loss or gain per unit area in building science.
Sizing HVAC loads by calculating heat transfer through building envelope elements.
Reporting heat flux results for fire testing and fire-resistance evaluations.
Characterizing thermal exposure in high-temperature furnace and plasma heating experiments.
Testing materials for thermal protection under concentrated heat flux conditions.

Tips & Best Practices

Always verify the compatibility of heat flux contexts before applying the conversion.
Be mindful that these units represent different British thermal unit definitions.
Use the conversion primarily to compare values across building science and high-intensity heat flux measurements.
Confirm your input values and double-check results to avoid rounding-sensitive errors.

Limitations

Units reference distinct Btu definitions (thermochemical vs. International Table), so direct equivalence is approximate.
Btu (IT)/second/square foot values represent much higher power levels, making conversions scale very small.
Conversions may be sensitive to rounding errors and should be used carefully only in compatible contexts.

Frequently Asked Questions

Why are there two different Btu units used in this conversion?: The units refer to different standards of the British thermal unit—thermochemical for Btu (th) and International Table for Btu (IT)—which are applied in different heat flux measurement contexts.
Can I use this converter for any heat flux density units?: No, this tool specifically converts between Btu (th)/hour/square foot and Btu (IT)/second/square foot units only.
What applications benefit from converting to Btu (IT)/second/square foot?: High-intensity heat flux scenarios such as fire testing, furnace experiments, and thermal protection material testing utilize Btu (IT)/second/square foot.

Key Terminology

Btu (th)/hour/square foot: A heat flux density unit measuring one thermochemical British thermal unit per hour across a square foot, used in building science and HVAC.
Btu (IT)/second/square foot: A heat flux density unit measuring one British thermal unit (International Table) per second across a square foot, used for high-intensity heat flux applications.
Heat Flux Density: The rate of heat energy transfer through a unit area, expressing how much heat flows per second or hour over a surface.

Quick Knowledge Check

Which unit represents heat flux density commonly used in building science and HVAC?

Btu (IT)/second/square foot

Btu (th)/hour/square foot

W/m²

What is the conversion rate from Btu (th)/hour/square foot to Btu (IT)/second/square foot?

0.000277592

3.1546

1.13565 × 10^4

In what context is Btu (IT)/second/square foot primarily used?

Building insulation heat loss calculations

Extreme radiative heat fluxes in fire testing

General energy consumption monitoring

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