13 Calorie (IT) to BTU (th)
Quick answer
13 Calorie (IT) (cal (IT)) equals
0.051623 BTU
To convert 13 Calorie (IT)s to BTU (th)s, multiply by 0.0039709774. Therefore, 13 Calorie (IT) (cal (IT)) equals 0.051623 BTU (th) (BTU).
Formula: BTU = cal (IT) × 0.0039709774. Calculation: 13 × 0.0039709774 = 0.051623 BTU.
Convert Calorie (IT) (cal (IT)) to BTU (th) (BTU) online with our free unit converter. In energy, 1 cal (IT) = 0.003971 BTU. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Calorie (IT) to BTU (th)
- Step 1 — start with the formula. BTU = cal (IT) × 0.0039709774
- Step 2 — substitute your figure. 13 cal (IT) × 0.0039709774
- Step 3 — read the result. 13 cal (IT) = 0.051623 BTU
- Step 4 — check it in reverse. cal (IT) = BTU × 251.8271711092 returns 13.0001 cal (IT), which matches the figure you started with.
Energy Converter
27 units available
13 cal (IT) = 0.051623 BTU
Formula:
BTU = cal (IT) × 0.0039709774With your value: 13 cal (IT) = 0.05162271 BTU
How big is that?
Everyday references on a logarithmic scale, all expressed in calorie (it) so you can sanity-check the result.
Other Calorie (IT) to BTU (th) conversions
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 |
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 |
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.
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
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
How to Convert Calorie (IT) to BTU (th)
To convert from Calorie (IT) (cal (IT)) to BTU (th) (BTU), multiply the value by 0.0039709774.
Formula: BTU = cal (IT) × 0.0039709774
Reverse: cal (IT) = BTU × 251.8271711092
Step-by-Step Example
- Start with your value in Calorie (IT). For example: 5 cal (IT)
- Multiply by the conversion factor: 5 x 0.0039709774
- The result is: 0.019855 BTU
Calorie (IT) and BTU (th) Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 Calorie (IT) represents a fraction of a BTU (th) (1 BTU (th) ≈ 251.8272 Calorie (IT)s), the BTU (th) is the larger measurement interval. Understanding the relationship between Calorie (IT) and BTU (th) is essential for accurate calculations in physics, engineering, commerce, and daily applications.
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.
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.
Frequently Asked Questions
- What is 13 Calorie (IT) in BTU (th)?
- 13 Calorie (IT) equals 0.051623 BTU (th).
- How many BTU (th)s are in 1 Calorie (IT)?
- There are exactly 0.0039709774 BTU (th)s in 1 Calorie (IT). This means the conversion factor from Calorie (IT) to BTU (th) is 0.0039709774.
- What is the formula to convert Calorie (IT) to BTU (th)?
- The formula to convert Calorie (IT) to BTU (th) is: BTU = cal (IT) × 0.0039709774. For example, to convert 10 Calorie (IT)s to BTU (th)s, you would multiply 10 by 0.0039709774.
- 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 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 are the common uses of Calorie (IT)?
- The Calorie (IT) is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). 13 Calorie (IT) to BTU (th). UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/13-calorie_it-to-btu