18 Joule to Calorie (th)
Quick answer
18 Joule (J) equals
4.302103 cal
To convert 18 Joules to Calorie (th)s, multiply by 0.2390057361. Therefore, 18 Joule (J) equals 4.302103 Calorie (th) (cal).
Formula: cal = J × 0.2390057361. Calculation: 18 × 0.2390057361 = 4.302103 cal.
Convert Joule (J) to Calorie (th) (cal) online with our free unit converter. In energy, 1 J = 0.239006 cal. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Joule to Calorie (th)
- Step 1 — start with the formula. cal = J × 0.2390057361
- Step 2 — substitute your figure. 18 J × 0.2390057361
- Step 3 — read the result. 18 J = 4.302103 cal
- Step 4 — check it in reverse. J = cal × 4.184 returns 18 J, which matches the figure you started with.
Energy Converter
27 units available
18 J = 4.302103 cal
Formula:
cal = J × 0.2390057361With your value: 18 J = 4.30210325 cal
How big is that?
Everyday references on a logarithmic scale, all expressed in joule so you can sanity-check the result.
Other Joule to Calorie (th) conversions
Joule to Calorie (th) Conversion Table
| Joule (J) | Calorie (th) (cal) |
|---|---|
| 0.5 | 0.119503 |
| 1 | 0.239006 |
| 2 | 0.478011 |
| 5 | 1.195029 |
| 10 | 2.390057 |
| 15 | 3.585086 |
| 20 | 4.780115 |
| 25 | 5.975143 |
| 50 | 11.950287 |
| 100 | 23.900574 |
| 250 | 59.751434 |
| 500 | 119.502868 |
| 1000 | 239.005736 |
Calorie (th) to Joule Conversion Table
| Calorie (th) (cal) | Joule (J) |
|---|---|
| 0.5 | 2.092 |
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1000 | 4,184 |
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.
Joule (J)
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
Calorie (th) (cal)
Energy
The thermochemical calorie is exactly 4.184 J.
The International Table calorie (4.1868 J) and the 15 °C calorie differ slightly.
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
Standards and context behind Joule to Calorie (th)
- Thermochemical calorie
- Exactly 4.184 J.
- International Table calorie
- 4.1868 J — a slightly different definition still used in steam tables.
- Food Calorie (kcal)
- Nutrition labels' capital-C Calorie is 1,000 small calories.
How to Convert Joule to Calorie (th)
To convert from Joule (J) to Calorie (th) (cal), multiply the value by 0.2390057361.
Formula: cal = J × 0.2390057361
Reverse: J = cal × 4.184
Step-by-Step Example
- Start with your value in Joule. For example: 5 J
- Multiply by the conversion factor: 5 x 0.2390057361
- The result is: 1.195029 cal
Joule and Calorie (th) Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 Joule represents a fraction of a Calorie (th) (1 Calorie (th) ≈ 4.184 Joules), the Calorie (th) is the larger measurement interval. Understanding the relationship between Joule and Calorie (th) is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Joule
The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
Common uses of Joule: physics, electrical engineering, chemistry.
About Calorie (th)
The thermochemical calorie equals 4.184 joules. Not to be confused with the food Calorie (kcal), which equals 1,000 calories.
Common uses of Calorie (th): chemistry, nutrition, heating.
Frequently Asked Questions
- What is 18 Joule in Calorie (th)?
- 18 Joule equals 4.302103 Calorie (th).
- How many Calorie (th)s are in 1 Joule?
- There are exactly 0.2390057361 Calorie (th)s in 1 Joule. This means the conversion factor from Joule to Calorie (th) is 0.2390057361.
- What is the formula to convert Joule to Calorie (th)?
- The formula to convert Joule to Calorie (th) is: cal = J × 0.2390057361. For example, to convert 10 Joules to Calorie (th)s, you would multiply 10 by 0.2390057361.
- What is a Joule?
- The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
- What is a Calorie (th)?
- The thermochemical calorie equals 4.184 joules. Not to be confused with the food Calorie (kcal), which equals 1,000 calories.
- What are the common uses of Joule?
- The Joule is commonly used in physics, electrical engineering, chemistry.
- Is a food Calorie a kilocalorie?
- Yes. One dietary Calorie equals 1 kcal = 4,184 joules.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). 18 Joule to Calorie (th). UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/18-joule-to-calorie