Joules per square centimeter to calories per square centimeter
Type a value in J/cm² to get it in cal/cm² instantly.
9.56cal/cm²
That's 2× as strong as optical damage threshold — nothing on our list beats it. A 1 mW/cm² source would need about 40,000 seconds to deliver it.
What it means
How big a dose is that?
Fluence is energy per area. Irradiance — watts per square meter — is the rate; multiply by the exposure time to get fluence.
The math
How to convert J/cm² to cal/cm²
To convert joules per square centimeter to calories per square centimeter, multiply by 0.239006.
Example: 40 J/cm² × 0.239006 = 9.56023 cal/cm².
In the other direction, 1 cal/cm² = 4.184 J/cm².
Every unit
Your dose in every unit
Tables
J/cm² to cal/cm² conversion table
| J/cm² | cal/cm² |
|---|---|
| 0.1 J/cm² | 0.0239006 cal/cm² |
| 1 J/cm² | 0.239006 cal/cm² |
| 5 J/cm² | 1.19503 cal/cm² |
| 10 J/cm² | 2.39006 cal/cm² |
| 25 J/cm² | 5.97514 cal/cm² |
| 40 J/cm² | 9.56023 cal/cm² |
| 100 J/cm² | 23.9006 cal/cm² |
| 250 J/cm² | 59.7514 cal/cm² |
| 500 J/cm² | 119.503 cal/cm² |
| 1,000 J/cm² | 239.006 cal/cm² |
| 5,000 J/cm² | 1,195.03 cal/cm² |
cal/cm² to J/cm² conversion table
| cal/cm² | J/cm² |
|---|---|
| 0.1 cal/cm² | 0.4184 J/cm² |
| 1 cal/cm² | 4.184 J/cm² |
| 5 cal/cm² | 20.92 J/cm² |
| 10 cal/cm² | 41.84 J/cm² |
| 25 cal/cm² | 104.6 J/cm² |
| 40 cal/cm² | 167.36 J/cm² |
| 100 cal/cm² | 418.4 J/cm² |
| 250 cal/cm² | 1,046 J/cm² |
| 500 cal/cm² | 2,092 J/cm² |
| 1,000 cal/cm² | 4,184 J/cm² |
| 5,000 cal/cm² | 20,920 J/cm² |
Quick answers
Quick answers
- How many cal/cm² is 1 J/cm²?
- 1 J/cm² is 0.239006 cal/cm².
- How many cal/cm² is 10 J/cm²?
- 10 J/cm² is 2.39006 cal/cm².
- How many cal/cm² is 40 J/cm²?
- 40 J/cm² is 9.56023 cal/cm².
The units
About these units
Joules per square centimeter (J/cm²)
For laser marking, cutting and ablation.
Calories per square centimeter (cal/cm²)
The thermal unit, used for burn and blast exposure.
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