Snellen 6/x denominators to Snellen 20/x denominators Converter
Convert Snellen 6/x denominators to Snellen 20/x denominators using 20/x denominator = (6/x denominator) ÷ 0.3. The formula is 20/x denominator = (6/x denominator) ÷ 0.3; 1 6/x is 3.333 20/x.
The denominator from a 6-meter Snellen visual acuity fraction, such as 12 in 6/12.
The denominator from a 20-foot Snellen visual acuity fraction, such as 40 in 20/40.
Start with your value in Snellen 6/x denominators, then apply the formula below. It stays visible so you can catch rounding mistakes instead of just copying the output.
Use these values for notation comparison and documentation checks only. They do not diagnose vision problems or replace an eye exam.
Visual acuity notation is often rounded to chart lines, so the converted numeric value may be more precise than the original measurement. This page displays converted values with up to 3 decimal places by default.
| Snellen 6/x denominators | Snellen 20/x denominators |
|---|---|
| 3 6/x | 10 20/x |
| 4.5 6/x | 15 20/x |
| 6 6/x | 20 20/x |
| 7.5 6/x | 25 20/x |
| 12 6/x | 40 20/x |
| 24 6/x | 80 20/x |
| 60 6/x | 200 20/x |
Useful for comparing eye chart notation systems. Use the same formula with your exact input if the measurement needs to be documented.
Useful for translating research tables and clinical references. Use the same formula with your exact input if the measurement needs to be documented.
Useful for checking educational vision examples. Use the same formula with your exact input if the measurement needs to be documented.
How do I convert Snellen 6/x denominators to Snellen 20/x denominators?
Enter the value in Snellen 6/x denominators and apply 20/x denominator = (6/x denominator) ÷ 0.3. Round the Snellen 20/x denominators result after the conversion, not before.
What is 1 Snellen 6/x denominator in Snellen 20/x denominators?
1 6/x equals 3.333 20/x with the current rounding setting. Keep more decimal places when the result feeds another calculation.
What is 3 6/x in 20/x?
3 6/x is 10 20/x. It appears in the lookup table so you can compare it with nearby amounts.
Can I convert Snellen 20/x denominators back to Snellen 6/x denominators?
Yes. Use the reverse Snellen 20/x denominators to Snellen 6/x denominators converter if you need to go the other direction.
How accurate is this Snellen 6/x denominators to Snellen 20/x denominators conversion?
The calculator runs the formula in your browser and rounds results to 3 decimal places by default. Visual acuity notation is often rounded to chart lines, so the converted numeric value may be more precise than the original measurement.