LogMAR to decimal acuity
Type a value in logMAR to get it in decimal instantly.
1decimal
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).
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 decimal
Decimal = 20 ÷ x for 20/x, or 6 ÷ x for 6/x; logMAR = −log₁₀(decimal); ETDRS letters = 85 − 50 × logMAR.
Example: 0 logMAR = 1 decimal.
Every unit
That eyesight in every notation
Tables
logMAR to decimal conversion table
| logMAR | decimal |
|---|---|
| -0.301 logMAR | 1.99986 decimal |
| -0.125 logMAR | 1.33352 decimal |
| 0 logMAR | 1 decimal |
| 0.0969 logMAR | 0.800018 decimal |
| 0.176 logMAR | 0.666807 decimal |
| 0.301 logMAR | 0.500035 decimal |
| 0.398 logMAR | 0.399945 decimal |
| 0.477 logMAR | 0.333426 decimal |
| 0.544 logMAR | 0.285759 decimal |
| 0.602 logMAR | 0.250035 decimal |
| 0.699 logMAR | 0.199986 decimal |
| 1 logMAR | 0.1 decimal |
| 1.3 logMAR | 0.0501187 decimal |
decimal to logMAR conversion table
| decimal | logMAR |
|---|---|
| 0.05 decimal | 1.30103 logMAR |
| 0.1 decimal | 1 logMAR |
| 0.2 decimal | 0.69897 logMAR |
| 0.25 decimal | 0.60206 logMAR |
| 0.286 decimal | 0.543634 logMAR |
| 0.333 decimal | 0.477556 logMAR |
| 0.4 decimal | 0.39794 logMAR |
| 0.5 decimal | 0.30103 logMAR |
| 0.667 decimal | 0.175874 logMAR |
| 0.8 decimal | 0.09691 logMAR |
| 1 decimal | 0 logMAR |
| 1.33 decimal | -0.123852 logMAR |
| 2 decimal | -0.30103 logMAR |
Quick answers
Quick answers
- How many decimal is 1 logMAR?
- 1 logMAR is 0.1 decimal.
- How many decimal is 10 logMAR?
- 10 logMAR is 1×10⁻¹⁰ decimal.
- How many decimal is 0 logMAR?
- 0 logMAR is 1 decimal.
The units
About these units
LogMAR (logMAR)
The log of the minimum angle of resolution: 0 is normal, higher is worse.
Decimal acuity (decimal)
The Snellen fraction as a number: 20/40 = 0.5. Used in Europe.
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