Free T3 unit converter
Convert free T3 between pg/mL, pmol/L and ng/dL. 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 pg/mL = 1.5362 pmol/L. Nothing you type here leaves your browser.
The conversion
- 1 pg/mL = 1.536 pmol/LFrom pg/mL to pmol/L: multiply by 1.536. Back again: divide by 1.536.
- 1 pg/mL = 0.1 ng/dLFrom pg/mL to ng/dL: divide by 10. Back again: multiply by 10.
pg/mL and ng/L give the same number.
Mass and molar units are linked by the molecular weight: 650.97 g/mol (liothyronine (T3), C15H12I3NO4). Source: PubChem, National Library of Medicine.
Common values
From zero to about twice the usual upper limit, plus the usual limits themselves.
| pg/mLsame as ng/L | pmol/L | ng/dL |
|---|---|---|
| 1 | 1.5 | 0.1 |
| 2 | 3.1 | 0.2 |
| 3 | 4.6 | 0.3 |
| 4 | 6.1 | 0.4 |
| 4.4 | 6.8 | 0.44 |
| 5 | 7.7 | 0.5 |
| 6 | 9.2 | 0.6 |
| 7 | 10.8 | 0.7 |
| 8 | 12.3 | 0.8 |
Usual ranges in each unit
What labs print as the reference range, by who was tested. Sources for each range are on the Free T3 page.
| Who | pg/mL | pmol/L | ng/dL |
|---|---|---|---|
| 1–5 | 2–6 | 3.1–9.2 | 0.2–0.6 |
| 6–10 | 2.7–5.2 | 4.1–8 | 0.27–0.52 |
| 11–19 | 2.3–5 | 3.5–7.7 | 0.23–0.5 |
| 20+ | 2–4.4 | 3.1–6.8 | 0.2–0.44 |