Joules per square centimeter to millijoules per square centimeter
Type a value in J/cm² to get it in mJ/cm² instantly.
40,000mJ/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.
Convert the other way: mJ/cm² to J/cm²
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 mJ/cm²
To convert joules per square centimeter to millijoules per square centimeter, multiply by 1,000.
Example: 40 J/cm² × 1,000 = 40,000 mJ/cm².
In the other direction, 1 mJ/cm² = 0.001 J/cm².
Every unit
Your dose in every unit
Tables
J/cm² to mJ/cm² conversion table
| J/cm² | mJ/cm² |
|---|---|
| 0.1 J/cm² | 100 mJ/cm² |
| 1 J/cm² | 1,000 mJ/cm² |
| 5 J/cm² | 5,000 mJ/cm² |
| 10 J/cm² | 10,000 mJ/cm² |
| 25 J/cm² | 25,000 mJ/cm² |
| 40 J/cm² | 40,000 mJ/cm² |
| 100 J/cm² | 100,000 mJ/cm² |
| 250 J/cm² | 250,000 mJ/cm² |
| 500 J/cm² | 500,000 mJ/cm² |
| 1,000 J/cm² | 1,000,000 mJ/cm² |
| 5,000 J/cm² | 5,000,000 mJ/cm² |
mJ/cm² to J/cm² conversion table
| mJ/cm² | J/cm² |
|---|---|
| 0.1 mJ/cm² | 0.0001 J/cm² |
| 1 mJ/cm² | 0.001 J/cm² |
| 5 mJ/cm² | 0.005 J/cm² |
| 10 mJ/cm² | 0.01 J/cm² |
| 25 mJ/cm² | 0.025 J/cm² |
| 40 mJ/cm² | 0.04 J/cm² |
| 100 mJ/cm² | 0.1 J/cm² |
| 250 mJ/cm² | 0.25 J/cm² |
| 500 mJ/cm² | 0.5 J/cm² |
| 1,000 mJ/cm² | 1 J/cm² |
| 5,000 mJ/cm² | 5 J/cm² |
Quick answers
Quick answers
- How many mJ/cm² is 1 J/cm²?
- 1 J/cm² is 1,000 mJ/cm².
- How many mJ/cm² is 10 J/cm²?
- 10 J/cm² is 10,000 mJ/cm².
- How many mJ/cm² is 40 J/cm²?
- 40 J/cm² is 40,000 mJ/cm².
The units
About these units
Joules per square centimeter (J/cm²)
For laser marking, cutting and ablation.
Millijoules per square centimeter (mJ/cm²)
The standard for UV dose and laser fluence.
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