BUN unit converter
Convert BUN between mg/dL and mmol/L. 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 mg/dL = 0.357 mmol/L. Nothing you type here leaves your browser.
The conversion
- 1 mg/dL = 0.357 mmol/LFrom mg/dL to mmol/L: divide by 2.801. Back again: multiply by 2.801.
Mass and molar units are linked by the molecular weight: 28.014 g/mol (Nitrogen (N2) carried by one molecule of urea. BUN in mmol/L counts urea molecules, and each holds 28.014 mg of nitrogen per mmol.). Source: PubChem (National Library of Medicine).
Common values
From zero to about twice the usual upper limit, plus the usual limits themselves.
| mg/dL | mmol/L |
|---|---|
| 5 | 1.8 |
| 6 | 2.1 |
| 8 | 2.9 |
| 10 | 3.6 |
| 15 | 5.4 |
| 20 | 7.1 |
| 21 | 7.5 |
| 24 | 8.6 |
| 25 | 8.9 |
| 30 | 10.7 |
| 35 | 12.5 |
| 40 | 14.3 |
| 45 | 16.1 |
Usual ranges in each unit
What labs print as the reference range, by who was tested. Sources for each range are on the BUN page.
| Who | mg/dL | mmol/L |
|---|---|---|
| Men, 18+ | 8–24 | 2.9–8.6 |
| Women, 18+ | 6–21 | 2.1–7.5 |
| 1–17 | 7–20 | 2.5–7.1 |