UV index to standard erythemal doses per hour
Type a value in UVI to get it in SED/h instantly.
That's 1.14× as strong as a European summer day, while a Mediterranean summer noon is 1.13× stronger. That is very high: avoid the midday sun.
Convert the other way: SED/h to UVI
What it means
How strong is that sun?
Information only. Burn times are for unprotected skin in full sun and vary a lot between people; sunscreen, shade and reflection from snow or water change them.
The math
How to convert UVI to SED/h
To convert UV index to standard erythemal doses per hour, multiply by 0.9.
Example: 8 UVI × 0.9 = 7.2 SED/h.
In the other direction, 1 SED/h = 1.11111 UVI.
Burn times below are for Type II: fair, usually burns. Change it above and they update.
Every unit
Your UV index in every unit
Tables
UVI to SED/h conversion table
| UVI | SED/h |
|---|---|
| 1 UVI | 0.9 SED/h |
| 2 UVI | 1.8 SED/h |
| 3 UVI | 2.7 SED/h |
| 4 UVI | 3.6 SED/h |
| 5 UVI | 4.5 SED/h |
| 6 UVI | 5.4 SED/h |
| 7 UVI | 6.3 SED/h |
| 8 UVI | 7.2 SED/h |
| 9 UVI | 8.1 SED/h |
| 10 UVI | 9 SED/h |
| 11 UVI | 9.9 SED/h |
| 12 UVI | 10.8 SED/h |
| 14 UVI | 12.6 SED/h |
SED/h to UVI conversion table
| SED/h | UVI |
|---|---|
| 1 SED/h | 1.11111 UVI |
| 2 SED/h | 2.22222 UVI |
| 3 SED/h | 3.33333 UVI |
| 4 SED/h | 4.44444 UVI |
| 5 SED/h | 5.55556 UVI |
| 6 SED/h | 6.66667 UVI |
| 7 SED/h | 7.77778 UVI |
| 8 SED/h | 8.88889 UVI |
| 9 SED/h | 10 UVI |
| 10 SED/h | 11.1111 UVI |
| 11 SED/h | 12.2222 UVI |
| 12 SED/h | 13.3333 UVI |
| 14 SED/h | 15.5556 UVI |
Quick answers
Quick answers
- How many SED/h is 1 UVI?
- 1 UVI is 0.9 SED/h.
- How many SED/h is 10 UVI?
- 10 UVI is 9 SED/h.
- How many SED/h is 8 UVI?
- 8 UVI is 7.2 SED/h.
The units
About these units
UV index (UVI)
The WHO scale: 25 mW/m² of sunburn-weighted UV per point.
Standard erythemal doses per hour (SED/h)
One SED is 100 J/m² of sunburn-weighted UV.
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