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Diabetes & metabolism

C-peptide: convert ng/mL to nmol/L

nmol/L = ng/mL × 0.3311

Calculator

Enter a value in any unit and all other units fill in.

Conversion formulas

ng/mL → nmol/Lnmol/L = ng/mL × 0.3311
nmol/L → ng/mLng/mL = nmol/L × 3.02

Conversion table

Highlighted: values inside the adult reference range.

ng/mLnmol/L
0.50.1655
10.3311
1.50.4966
20.6622
2.50.8277
30.9933
3.51.159
41.324
4.51.49
51.655
5.51.821
61.987
6.52.152
72.318
7.52.483
82.649

Reference range

0.3 – 3.3 ng/mL = 0.0993 – 1.093 nmol/L

Source: MedlinePlus (NLM): Insulin C-peptide test · Last reviewed: 2026-10-14

Frequently asked questions

How do I convert C-peptide from ng/mL to nmol/L?

nmol/L = ng/mL × 0.3311. For example, 2 ng/mL equals 0.662 nmol/L.

How many nmol/L are 2 ng/mL?

2 ng/mL equal 0.662 nmol/L (C-peptide).

How do I convert C-peptide from nmol/L back to ng/mL?

ng/mL = nmol/L × 3.02.

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