Why do Btu (th)/hour and Btu (IT)/hour differ?

They are based on different definitions of the British thermal unit, causing slight variations in energy content and power representation.

When should I convert between these units?

Conversion is helpful to standardize heat transfer measurements for HVAC sizing, equipment rating, and energy calculations.

Can I use these units interchangeably without conversion?

No, because of the subtle differences, converting ensures consistent and accurate thermal data handling.

How to Convert from Btu (th)/hour [Btu (th)/h] to Btu (IT)/hour [Btu/h]

Learn how to convert power units from thermochemical British thermal units per hour to International Table British thermal units per hour using this simple and accurate converter.

Btu (th)/hour [Btu (th)/h]

Btu (IT)/hour [Btu/h]

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

Btu (th)/hour [Btu (th)/h] to Btu (IT)/hour [Btu/h] Conversion Table

Btu (th)/hour [Btu (th)/h]	Btu (IT)/hour [Btu/h]

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 [Btu (th)/h] to Btu (IT)/hour [Btu/h] Conversion Table
Btu (th)/hour [Btu (th)/h]	Btu (IT)/hour [Btu/h]

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What Is This Tool?

This tool converts power measurements from Btu (th)/hour to Btu (IT)/hour, both units that quantify heat transfer rates but are based on different British thermal unit definitions. It helps ensure consistent and standardized calculations in heating and cooling applications.

How to Use This Tool?

Enter the value in Btu (th)/hour you wish to convert
Choose the target unit as Btu (IT)/hour
Click the convert button to see the result
Use the output for equipment rating and thermal calculations

Key Features

Converts between thermochemical and International Table British thermal unit per hour units
Supports HVAC equipment sizing and heat output specification
Includes common examples for quick reference
Browser-based and easy to use with no installation required

Examples

10 Btu (th)/hour is equal to 9.993309808 Btu (IT)/hour
50 Btu (th)/hour equals 49.96654904 Btu (IT)/hour

Common Use Cases

Sizing and rating of HVAC systems, including furnaces and air conditioners
Specifying heat output for boilers, water heaters, and heat exchangers
Estimating building heating and cooling loads or refrigeration capacity
Aligning measurements for energy modeling and thermal design applications

Tips & Best Practices

Be aware of the slight difference in energy definitions when converting
Use standardized units to ensure consistency in engineering calculations
Apply conversions carefully in sensitive thermal or regulatory contexts
Verify unit selection to avoid mixing thermochemical and International Table BTU measurements

Limitations

Small differences between units may impact highly precise engineering designs
Units approximate power around 0.29307107 watts but differ slightly by definition
Exercise caution when combining data from both unit types due to energy content variations

Frequently Asked Questions

Why do Btu (th)/hour and Btu (IT)/hour differ?: They are based on different definitions of the British thermal unit, causing slight variations in energy content and power representation.
When should I convert between these units?: Conversion is helpful to standardize heat transfer measurements for HVAC sizing, equipment rating, and energy calculations.
Can I use these units interchangeably without conversion?: No, because of the subtle differences, converting ensures consistent and accurate thermal data handling.

Key Terminology

Btu (th)/hour: A unit of power equal to one thermochemical British thermal unit transferred per hour, used to quantify heat transfer rates.
Btu (IT)/hour: A power unit corresponding to one International Table British thermal unit delivered or removed per hour, indicating heat transfer rate.

Quick Knowledge Check

What does Btu (th)/hour measure?

Heat content in joules

Rate of heat transfer based on thermochemical Btu

Electrical power consumption

Which unit is used to rate furnace capacity?

Btu (IT)/hour

Btu (th)/hour

Both units are used

What should you consider when converting these units?

Differences in definitions affecting precision

Color coding of units

Measurement location

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