Fujita rating (1971) to Enhanced Fujita rating
Type a value in F scale to get it in EF scale instantly.
EF3EF scale
That's 1.28× as strong as a strong EF2 tornado, while a violent EF4 tornado is 1.16× stronger.
Convert the other way: EF scale to F scale
What it means
How strong is that tornado?
EF uses three-second gusts and the old F-scale fastest-quarter-mile winds, so the same rating number means different speeds. Ratings are estimated from damage.
The math
How to convert F scale to EF scale
EF ratings are gust bands: EF0 = 65–85 mph, EF1 = 86–110, EF2 = 111–135, EF3 = 136–165, EF4 = 166–200, EF5 over 200. TORRO: v = 2.365 × (T + 4)^1.5 m/s.
Example: F3 F scale = EF3 EF scale.
Every unit
That tornado on every scale
Tables
F scale to EF scale conversion table
| F scale | EF scale |
|---|---|
| F1 F scale | EF0 EF scale |
| F2 F scale | EF2 EF scale |
| F3 F scale | EF3 EF scale |
| F4 F scale | EF5 EF scale |
EF scale to F scale conversion table
| EF scale | F scale |
|---|---|
| EF0 EF scale | F0 F scale |
| EF1 EF scale | F1 F scale |
| EF2 EF scale | F1 F scale |
| EF3 EF scale | F2 F scale |
| EF4 EF scale | F3 F scale |
| EF5 EF scale | F3 F scale |
Quick answers
Quick answers
- How many EF scale is F1 F scale?
- F1 F scale is EF0 EF scale.
- How many EF scale is F3 F scale?
- F3 F scale is EF3 EF scale.
The units
About these units
Fujita rating (1971) (F scale)
The original F0 to F5 scale.
Enhanced Fujita rating (EF scale)
EF0 to EF5, used in the US and Canada.
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