Earth Science & Energy
Enhanced Fujita Scale (EF0 to EF5) Tornado Wind Speed Sizer
Calculate enhanced fujita scale (ef0 to ef5) tornado wind speed using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Enhanced Fujita Scale (EF0 to EF5) Tornado Wind Speed Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
EF wind bins (3-second gust, mph, rounded to whole mph): EF0 65–85, EF1 86–110, EF2 111–135, EF3 136–165, EF4 166–200, EF5 > 200
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • US EF wind-bin lookup, estimated3-second gust mph: EF0 65–85; EF1 86–110; EF2 111–135; EF3 136–165; EF4 166–200; EF5>200. Below65mph is outside these EF wind bins.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • An official EF rating is inferred from damage indicators and degrees of damage, not assigned from a generic user-entered wind speed alone. Label output wind-bin correspondence; handle noninteger speeds with a documented boundary convention and do not imply an official tornado assessment.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Estimated 3-second gust (mph) | Matching EF wind bin (−1 = below EF0) |
|---|---|---|
| Worked example | 120 | 2 EF |
| Half the amounts | 60 | -1 EF |
| Double the amounts | 240 | 5 EF |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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