COHb unit converter
Convert COHb between % and fraction (0–1). Type in either box. The factors come from our catalog and are checked by code.
AI-verified against cited sources. Awaiting expert reviewLast reviewed 2026-10-03
1 % = 0.01 fraction (0–1). Nothing you type here leaves your browser.
The conversion
- 1 % = 0.01 fraction (0–1)From % to fraction (0–1): divide by 100. Back again: multiply by 100.
Common values
From zero to about twice the usual upper limit, plus the usual limits themselves.
| % | fraction (0–1) |
|---|---|
| 0.5 | 0.005 |
| 1 | 0.01 |
| 1.5 | 0.015 |
| 2 | 0.02 |
| 2.5 | 0.025 |
| 3 | 0.03 |
| 3.5 | 0.035 |
| 4 | 0.04 |
Usual ranges in each unit
What labs print as the reference range, by who was tested. Sources for each range are on the COHb page.
| Who | % | fraction (0–1) |
|---|---|---|
| Adults | 0–2 | 0–0.02 |