What is the difference between Btu (IT) and Btu (th)?

Btu (IT) is based on the International Steam Tables, while Btu (th) uses the thermochemical calorie basis. Their energy values differ slightly to reflect these definitions.

When should I convert Btu (IT) to Btu (th)?

Convert when you need to align energy measurements with thermochemical standards, such as in heating/cooling equipment ratings or fuel energy content evaluation.

Is the conversion between Btu (IT) and Btu (th) significant?

For rough calculations, the difference is minor, but for precise scientific or engineering work, it should be considered.

How to Convert from Btu (IT) to Btu (th)?

Convert energy units from Btu (IT) to Btu (th) using this easy-to-use tool to align energy measurements with thermochemical standards.

Btu (IT) [Btu (IT), Btu]

Btu (th) [Btu (th)]

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

Btu (IT) [Btu (IT), Btu] to Btu (th) [Btu (th)] Conversion Table

Btu (IT) [Btu (IT), Btu]	Btu (th) [Btu (th)]

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 (IT) [Btu (IT), Btu] to Btu (th) [Btu (th)] Conversion Table
Btu (IT) [Btu (IT), Btu]	Btu (th) [Btu (th)]

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What Is This Tool?

This converter facilitates transforming energy values from Btu (IT), defined in the International Steam Tables, to the thermochemical British thermal unit Btu (th). It helps users apply consistent energy standards in thermodynamics, heating, and cooling applications.

How to Use This Tool?

Enter the value in Btu (IT) that you want to convert
Select Btu (IT) as the source unit and Btu (th) as the target unit
Click the convert button to see the equivalent energy value in Btu (th)
Use the output for energy comparisons or equipment ratings

Key Features

Converts energy units from Btu (IT) to Btu (th) with a precise conversion factor
Supports energy measurement alignment for engineering and HVAC contexts
Enables quick and browser-based unit conversion without installation
Provides example conversions for better understanding

Examples

Convert 10 Btu (IT) to get 10.006694671 Btu (th)
Convert 50 Btu (IT) to get 50.033473355 Btu (th)

Common Use Cases

Specifying energy content of heating and cooling equipment
Expressing calorific value of fuels and combustion energy
Sizing and comparing HVAC and hot-water systems
Conducting thermodynamic and heat-transfer calculations

Tips & Best Practices

Use this converter to ensure energy values match thermochemical standards
Apply the conversion for accurate equipment capacity comparisons
Consider the small difference between Btu (IT) and Btu (th) in precise calculations
Refer to example values to verify results

Limitations

The difference between Btu (IT) and Btu (th) is minor and may be negligible in approximate calculations
For detailed scientific research or exact energy balances, this difference should be accounted for

Frequently Asked Questions

What is the difference between Btu (IT) and Btu (th)?: Btu (IT) is based on the International Steam Tables, while Btu (th) uses the thermochemical calorie basis. Their energy values differ slightly to reflect these definitions.
When should I convert Btu (IT) to Btu (th)?: Convert when you need to align energy measurements with thermochemical standards, such as in heating/cooling equipment ratings or fuel energy content evaluation.
Is the conversion between Btu (IT) and Btu (th) significant?: For rough calculations, the difference is minor, but for precise scientific or engineering work, it should be considered.

Key Terminology

Btu (IT): A British thermal unit defined by the International Steam Tables measuring energy, approximately 1,055.05585 joules.
Btu (th): The thermochemical British thermal unit, based on the heat required to raise one pound of water by one degree Fahrenheit, about 1,055 joules.

Quick Knowledge Check

What does Btu (IT) stand for?

British thermal unit from thermochemical calorie basis

British thermal unit defined by the International Steam Tables

British thermal unit for natural gas measurements

Why convert Btu (IT) to Btu (th)?

To align with thermochemical standards

To measure power in horsepower

To calculate electrical energy only

Which application is typical for Btu (th)?

Expressing appliance energy content

Calculating distances

Measuring atmospheric pressure

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