Snellen (meters) to Snellen (feet)
Type a value in Snellen (m) to get it in Snellen (ft) instantly.
That's 3× as sharp as the US legal blindness limit (20/200), while the usual driving minimum (20/40) is 1.67× sharper. What a normal eye reads at 20 ft (6 m), this eye reads from about 6 ft (1.8 m).
Convert the other way: Snellen (ft) to Snellen (m)
What it means
How sharp is that?
For information only: an eye test also depends on the chart, lighting and the examiner. Ask an optometrist about your own eyes.
The math
How to convert Snellen (m) to Snellen (ft)
Decimal = 20 ÷ x for 20/x, or 6 ÷ x for 6/x; logMAR = −log₁₀(decimal); ETDRS letters = 85 − 50 × logMAR.
Example: 6/20 Snellen (m) = 20/67 Snellen (ft).
Every unit
That eyesight in every notation
Tables
Snellen (m) to Snellen (ft) conversion table
| Snellen (m) | Snellen (ft) |
|---|---|
| 6/10 Snellen (m) | 20/33 Snellen (ft) |
| 6/15 Snellen (m) | 20/50 Snellen (ft) |
| 6/20 Snellen (m) | 20/67 Snellen (ft) |
| 6/25 Snellen (m) | 20/83 Snellen (ft) |
| 6/30 Snellen (m) | 20/100 Snellen (ft) |
| 6/40 Snellen (m) | 20/133 Snellen (ft) |
| 6/50 Snellen (m) | 20/167 Snellen (ft) |
| 6/60 Snellen (m) | 20/200 Snellen (ft) |
| 6/70 Snellen (m) | 20/233 Snellen (ft) |
| 6/80 Snellen (m) | 20/267 Snellen (ft) |
| 6/100 Snellen (m) | 20/333 Snellen (ft) |
| 6/200 Snellen (m) | 20/667 Snellen (ft) |
| 6/400 Snellen (m) | 20/1333 Snellen (ft) |
Snellen (ft) to Snellen (m) conversion table
| Snellen (ft) | Snellen (m) |
|---|---|
| 20/10 Snellen (ft) | 6/3 Snellen (m) |
| 20/15 Snellen (ft) | 6/4.5 Snellen (m) |
| 20/20 Snellen (ft) | 6/6 Snellen (m) |
| 20/25 Snellen (ft) | 6/7.5 Snellen (m) |
| 20/30 Snellen (ft) | 6/9 Snellen (m) |
| 20/40 Snellen (ft) | 6/12 Snellen (m) |
| 20/50 Snellen (ft) | 6/15 Snellen (m) |
| 20/60 Snellen (ft) | 6/18 Snellen (m) |
| 20/70 Snellen (ft) | 6/21 Snellen (m) |
| 20/80 Snellen (ft) | 6/24 Snellen (m) |
| 20/100 Snellen (ft) | 6/30 Snellen (m) |
| 20/200 Snellen (ft) | 6/60 Snellen (m) |
| 20/400 Snellen (ft) | 6/120 Snellen (m) |
Quick answers
Quick answers
- How many Snellen (ft) is 6/1 Snellen (m)?
- 6/1 Snellen (m) is 20/3.3 Snellen (ft).
- How many Snellen (ft) is 6/10 Snellen (m)?
- 6/10 Snellen (m) is 20/33 Snellen (ft).
- How many Snellen (ft) is 6/20 Snellen (m)?
- 6/20 Snellen (m) is 20/67 Snellen (ft).
The units
About these units
Snellen (meters) (Snellen (m))
The UK and metric fraction: 6 meters over the normal distance.
Snellen (feet) (Snellen (ft))
The US fraction: 20 feet over the normal distance.
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