EVERYDAY
Ratios & concentration
Dimensionless ratios, percentages and parts-per notation.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result0.01 11 % = 0.01 1
EVERYDAY · ENGINEERING · SCIENCE
% to 1 Converter
Convert percent (%) to ratio (1). Enter a value for an instant result, or use the examples and reverse conversion below.
520units ready to convert
HOW IT IS CALCULATED
Convert through ratio
Enter a percent value to calculate ratio with full internal precision before display rounding.
Display PrecisionAuto · 6 significant digits
Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| ratiofrom % | 1 | 0.01 |
| percentfrom % | % | 1 |
| per millefrom % | ‰ | 10 |
| parts per millionfrom % | ppm | 10000 |
| parts per billionfrom % | ppb | 10000000 |
| parts per trillionfrom % | ppt | 10000000000 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
% to 1 Conversion Reference
Percent (%) and ratio (1) are units of ratios & concentration. Use this page to convert in either direction.
Conversion Examples
| Percent (%) | Ratio (1) |
|---|---|
| 1 % | 0.01 1 |
| 5 % | 0.05 1 |
| 10 % | 0.1 1 |
| 100 % | 1 1 |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.