1 BTU (th) to Calorie (IT)
Quick answer
1 BTU (th) (BTU) equals
251.827171 cal (IT)
To convert 1 BTU (th)s to Calorie (IT)s, multiply by 251.8271711092. Therefore, 1 BTU (th) (BTU) equals 251.827171 Calorie (IT) (cal (IT)).
Formula: cal (IT) = BTU × 251.8271711092. Calculation: 1 × 251.8271711092 = 251.827171 cal (IT).
Convert BTU (th) (BTU) to Calorie (IT) (cal (IT)) online with our free unit converter. In energy, 1 BTU = 251.827171 cal (IT). Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting BTU (th) to Calorie (IT)
- Step 1 — start with the formula. cal (IT) = BTU × 251.8271711092
- Step 2 — substitute your figure. 1 BTU × 251.8271711092
- Step 3 — read the result. 1 BTU = 251.827171 cal (IT)
- Step 4 — check it in reverse. BTU = cal (IT) × 0.0039709774 returns 1 BTU, which matches the figure you started with.
Energy Converter
27 units available
1 BTU = 251.827171 cal (IT)
Formula:
cal (IT) = BTU × 251.8271711092With your value: 1 BTU = 251.82717111 cal (IT)
How big is that?
Everyday references on a logarithmic scale, all expressed in btu (th) so you can sanity-check the result.
Other BTU (th) to Calorie (IT) conversions
BTU (th) to Calorie (IT) Conversion Table
| BTU (th) (BTU) | Calorie (IT) (cal (IT)) |
|---|---|
| 0.5 | 125.913586 |
| 1 | 251.827171 |
| 2 | 503.654342 |
| 5 | 1,259.135856 |
| 10 | 2,518.271711 |
| 15 | 3,777.407567 |
| 20 | 5,036.543422 |
| 25 | 6,295.679278 |
| 50 | 12,591.358555 |
| 100 | 25,182.717111 |
| 250 | 62,956.792777 |
| 500 | 125,913.585555 |
| 1000 | 251,827.171109 |
Calorie (IT) to BTU (th) Conversion Table
| Calorie (IT) (cal (IT)) | BTU (th) (BTU) |
|---|---|
| 0.5 | 0.001985 |
| 1 | 0.003971 |
| 2 | 0.007942 |
| 5 | 0.019855 |
| 10 | 0.03971 |
| 15 | 0.059565 |
| 20 | 0.07942 |
| 25 | 0.099274 |
| 50 | 0.198549 |
| 100 | 0.397098 |
| 250 | 0.992744 |
| 500 | 1.985489 |
| 1000 | 3.970977 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
BTU (th) (BTU)
Energy
The International Table BTU is exactly 1055.055 852 62 J.
Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Calorie (IT) (cal (IT))
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert BTU (th) to Calorie (IT)
To convert from BTU (th) (BTU) to Calorie (IT) (cal (IT)), multiply the value by 251.8271711092.
Formula: cal (IT) = BTU × 251.8271711092
Reverse: BTU = cal (IT) × 0.0039709774
Step-by-Step Example
- Start with your value in BTU (th). For example: 5 BTU
- Multiply by the conversion factor: 5 x 251.8271711092
- The result is: 1,259.135856 cal (IT)
BTU (th) and Calorie (IT) Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 BTU (th) equals approximately 251.8272 Calorie (IT)s, the BTU (th) represents a larger unit interval than the Calorie (IT). Understanding the relationship between BTU (th) and Calorie (IT) is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About BTU (th)
The BTU (th) (symbol: BTU) is a recognized unit in the US Customary / Imperial measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of BTU (th): energy calculations, engineering and science, education.
About Calorie (IT)
The Calorie (IT) (symbol: cal (IT)) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of Calorie (IT): energy calculations, engineering and science, education.
Frequently Asked Questions
- What is 1 BTU (th) in Calorie (IT)?
- 1 BTU (th) equals 251.827171 Calorie (IT).
- How many Calorie (IT)s are in 1 BTU (th)?
- There are exactly 251.8271711092 Calorie (IT)s in 1 BTU (th). This means the conversion factor from BTU (th) to Calorie (IT) is 251.8271711092.
- What is the formula to convert BTU (th) to Calorie (IT)?
- The formula to convert BTU (th) to Calorie (IT) is: cal (IT) = BTU × 251.8271711092. For example, to convert 10 BTU (th)s to Calorie (IT)s, you would multiply 10 by 251.8271711092.
- What is a BTU (th)?
- The BTU (th) (symbol: BTU) is a recognized unit in the US Customary / Imperial measurement framework, utilized within energy applications for precision and standardized data representation.
- What is a Calorie (IT)?
- The Calorie (IT) (symbol: cal (IT)) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
- What are the common uses of BTU (th)?
- The BTU (th) is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). 1 BTU (th) to Calorie (IT). UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/1-btu-to-calorie_it