Relative permittivity (dielectric constant) to farads per meter
Type a value in εr to get it in F/m instantly.
3.896×10⁻¹¹F/m
That's about the same as FR-4 circuit board. A signal in it travels at about 47.67% of the speed of light.
Convert the other way: F/m to εr
What it means
How strongly does it polarize?
Values are typical at low frequency and room temperature. Water’s permittivity falls sharply at microwave frequencies, which is how microwave ovens heat it.
The math
How to convert εr to F/m
To convert relative permittivity (dielectric constant) to farads per meter, multiply by 8.854×10⁻¹².
Example: 4.4 εr × 8.854×10⁻¹² = 3.896×10⁻¹¹ F/m.
In the other direction, 1 F/m = 1.129×10¹¹ εr.
Every unit
Your permittivity in every unit
Tables
εr to F/m conversion table
| εr | F/m |
|---|---|
| 1 εr | 8.854×10⁻¹² F/m |
| 1.5 εr | 1.328×10⁻¹¹ F/m |
| 2 εr | 1.771×10⁻¹¹ F/m |
| 2.1 εr | 1.859×10⁻¹¹ F/m |
| 3 εr | 2.656×10⁻¹¹ F/m |
| 4 εr | 3.542×10⁻¹¹ F/m |
| 4.4 εr | 3.896×10⁻¹¹ F/m |
| 6 εr | 5.313×10⁻¹¹ F/m |
| 10 εr | 8.854×10⁻¹¹ F/m |
| 20 εr | 1.771×10⁻¹⁰ F/m |
| 50 εr | 4.427×10⁻¹⁰ F/m |
| 80 εr | 7.083×10⁻¹⁰ F/m |
F/m to εr conversion table
| F/m | εr |
|---|---|
| 1 F/m | 1.129×10¹¹ εr |
| 1.5 F/m | 1.694×10¹¹ εr |
| 2 F/m | 2.259×10¹¹ εr |
| 2.1 F/m | 2.372×10¹¹ εr |
| 3 F/m | 3.388×10¹¹ εr |
| 4 F/m | 4.518×10¹¹ εr |
| 4.4 F/m | 4.969×10¹¹ εr |
| 6 F/m | 6.776×10¹¹ εr |
| 10 F/m | 1.129×10¹² εr |
| 20 F/m | 2.259×10¹² εr |
| 50 F/m | 5.647×10¹² εr |
| 80 F/m | 9.035×10¹² εr |
Quick answers
Quick answers
- How many F/m is 1 εr?
- 1 εr is 8.854×10⁻¹² F/m.
- How many F/m is 10 εr?
- 10 εr is 8.854×10⁻¹¹ F/m.
- How many F/m is 4.4 εr?
- 4.4 εr is 3.896×10⁻¹¹ F/m.
The units
About these units
Relative permittivity (dielectric constant) (εr)
Compared with a vacuum, which is exactly 1.
Farads per meter (F/m)
The SI unit of absolute permittivity.
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