Blood Test Helper

Vitamin D nmol/L to ng/mL Converter

Convert your 25(OH)D vitamin D blood test result between nmol/L and ng/mL. The conversion is simple: divide nmol/L by 2.5, or multiply ng/mL by 2.5.

25(OH)D in ng/mL

ng/mL

25(OH)D in nmol/L

nmol/L

This calculator only converts units. It does not interpret whether your result is right for you. Use your own lab's reference range and discuss high-dose vitamin D3 use with your clinician.

Quick Reference

nmol/L to ng/mL: divide by 2.5.
ng/mL to nmol/L: multiply by 2.5.
25(OH)D is the usual blood marker for vitamin D status.
Calcium and PTH help give safety context when using higher-dose vitamin D3.

Common 25(OH)D values
nmol/L	ng/mL
25	10
50	20
75	30
100	40
125	50
150	60
200	80
250	100

Blood tests to ask about Understand PTH and calcium

Vitamin D nmol/L to ng/mL Converter

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