LogMAR to Snellen (feet)
Type a value in logMAR to get it in Snellen (ft) instantly.
20/20Snellen (ft)
That's about the same as normal vision (20/20). What a normal eye reads at 20 ft (6 m), this eye reads from about 20 ft (6 m).
Convert the other way: Snellen (ft) to logMAR
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 logMAR to Snellen (ft)
Decimal = 20 ÷ x for 20/x, or 6 ÷ x for 6/x; logMAR = −log₁₀(decimal); ETDRS letters = 85 − 50 × logMAR.
Example: 0 logMAR = 20/20 Snellen (ft).
Every unit
That eyesight in every notation
Tables
logMAR to Snellen (ft) conversion table
| logMAR | Snellen (ft) |
|---|---|
| -0.301 logMAR | 20/10 Snellen (ft) |
| -0.125 logMAR | 20/15 Snellen (ft) |
| 0 logMAR | 20/20 Snellen (ft) |
| 0.0969 logMAR | 20/25 Snellen (ft) |
| 0.176 logMAR | 20/30 Snellen (ft) |
| 0.301 logMAR | 20/40 Snellen (ft) |
| 0.398 logMAR | 20/50 Snellen (ft) |
| 0.477 logMAR | 20/60 Snellen (ft) |
| 0.544 logMAR | 20/70 Snellen (ft) |
| 0.602 logMAR | 20/80 Snellen (ft) |
| 0.699 logMAR | 20/100 Snellen (ft) |
| 1 logMAR | 20/200 Snellen (ft) |
| 1.3 logMAR | 20/399 Snellen (ft) |
Snellen (ft) to logMAR conversion table
| Snellen (ft) | logMAR |
|---|---|
| 20/10 Snellen (ft) | -0.30103 logMAR |
| 20/15 Snellen (ft) | -0.124939 logMAR |
| 20/20 Snellen (ft) | 0 logMAR |
| 20/25 Snellen (ft) | 0.09691 logMAR |
| 20/30 Snellen (ft) | 0.176091 logMAR |
| 20/40 Snellen (ft) | 0.30103 logMAR |
| 20/50 Snellen (ft) | 0.39794 logMAR |
| 20/60 Snellen (ft) | 0.477121 logMAR |
| 20/70 Snellen (ft) | 0.544068 logMAR |
| 20/80 Snellen (ft) | 0.60206 logMAR |
| 20/100 Snellen (ft) | 0.69897 logMAR |
| 20/200 Snellen (ft) | 1 logMAR |
| 20/400 Snellen (ft) | 1.30103 logMAR |
Quick answers
Quick answers
- How many Snellen (ft) is 1 logMAR?
- 1 logMAR is 20/200 Snellen (ft).
- How many Snellen (ft) is 10 logMAR?
- 10 logMAR is 20/200000000000 Snellen (ft).
- How many Snellen (ft) is 0 logMAR?
- 0 logMAR is 20/20 Snellen (ft).
The units
About these units
LogMAR (logMAR)
The log of the minimum angle of resolution: 0 is normal, higher is worse.
Snellen (feet) (Snellen (ft))
The US fraction: 20 feet over the normal distance.
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