What is the main difference between calorie (IT)/hour and calorie (th)/hour?

Calorie (IT)/hour is based on the International Table calorie defined as 4.1868 joules, while calorie (th)/hour uses the thermochemical calorie exactly equal to 4.184 joules, resulting in a slight difference in power measurement.

Why would I need to convert between these two calories per hour units?

Conversion ensures consistency when working with heat transfer data from different sources or historical literature that use either the International or thermochemical calorie definitions.

Is calorie per hour commonly used in modern measurements?

Both calorie (IT)/hour and calorie (th)/hour are mainly used in specialized, calorimetric, or historical contexts and have been mostly superseded by the watt, the standard SI unit for power.

How to Convert from Calorie (IT)/hour [cal/h] to Calorie (th)/hour [cal (th)/h]?

Convert power units from calorie (IT)/hour to calorie (th)/hour using our precise online converter. Understand the differences and applications of these heat-transfer measurements.

Calorie (IT)/hour [cal/h]

Calorie (th)/hour [cal (th)/h]

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

Calorie (IT)/hour [cal/h]	Calorie (th)/hour [cal (th)/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.

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

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What Is This Tool?

This tool allows you to convert units of power measuring heat transfer rates from calorie (IT)/hour, based on the International Table calorie, to calorie (th)/hour, based on the thermochemical calorie. It is designed for accurate translation between these two similar but distinct units used in thermal and calorimetric contexts.

How to Use This Tool?

Enter the value in calorie (IT)/hour you wish to convert
Select calorie (IT)/hour as the source unit
Choose calorie (th)/hour as the target unit
Click convert to get the equivalent value in calorie (th)/hour
Use the result for precise heat transfer or thermal power calculations

Key Features

Converts between calorie (IT)/hour and calorie (th)/hour units of power
Supports precise representation of small heat transfer rates
Ideal for laboratory calorimetry, thermal experiments, and historical data
Browser-based and easy to use without installation
Provides exact conversion rate for accurate scientific use

Examples

Convert 5 calorie (IT)/hour to calorie (th)/hour: 5 × 1.0006692161 = 5.0033460805 calorie (th)/hour
Convert 10 calorie (IT)/hour to calorie (th)/hour: 10 × 1.0006692161 = 10.006692161 calorie (th)/hour

Common Use Cases

Reporting small heat-transfer rates in laboratory calorimetry or thermal analysis
Interpreting historical technical documents that use calorie units
Estimating low-level heat losses or gains in small insulated components
Expressing metabolic or physiological heat production rates in thermal contexts
Converting heat-transfer data between International Table and thermochemical calorie scales

Tips & Best Practices

Ensure correct unit selection to maintain measurement consistency
Use this conversion for specialized or historical thermal data interpretation
Cross-check conversion results in critical scientific calculations
Remember watt remains the SI preferred power unit for general use
Maintain proper constants definitions for calorie units when converting

Limitations

The difference between units is very small but important in precise contexts
Conversion accuracy depends on maintaining correct calorie constants
Both units are largely replaced by the watt in standard SI applications
Use is primarily relevant in specialized scientific or historical fields

Frequently Asked Questions

What is the main difference between calorie (IT)/hour and calorie (th)/hour?: Calorie (IT)/hour is based on the International Table calorie defined as 4.1868 joules, while calorie (th)/hour uses the thermochemical calorie exactly equal to 4.184 joules, resulting in a slight difference in power measurement.
Why would I need to convert between these two calories per hour units?: Conversion ensures consistency when working with heat transfer data from different sources or historical literature that use either the International or thermochemical calorie definitions.
Is calorie per hour commonly used in modern measurements?: Both calorie (IT)/hour and calorie (th)/hour are mainly used in specialized, calorimetric, or historical contexts and have been mostly superseded by the watt, the standard SI unit for power.

Key Terminology

Calorie (IT)/hour: Power unit measuring heat transfer based on the International Table calorie, equal to approximately 4.1868 joules per hour.
Calorie (th)/hour: Power unit measuring heat transfer using the thermochemical calorie defined as exactly 4.184 joules per hour.
Power: The rate at which energy is transferred or converted, commonly expressed in watts or calorie per hour in thermal contexts.

Quick Knowledge Check

Which unit is based on the definition of 4.184 joules?

Calorie (IT)/hour

Calorie (th)/hour

Watt

What is a common use case for converting calorie (IT)/hour to calorie (th)/hour?

Estimating metabolic rates

Measuring electrical current

Calculating distance

Which power unit is preferred in the SI system?

Calorie (th)/hour

Watt

Calorie (IT)/hour

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