C-reactive protein (CRP) mg/L → mg/dL

Convert c-reactive protein (crp) from mg/L to mg/dL

Sources last checked: 2026-11-03

C-reactive protein (CRP) mg/L → mg/dL

Convert c-reactive protein (crp) from mg/L to mg/dL

C-reactive protein (CRP) (mg/L)

Fill in every field to see the result.

Converts units only; reference ranges depend on the laboratory, the assay and the patient.

Source: BIPM. The International System of Units (SI), 9th edition, 2019 — Table 8 (non-SI units accepted for use with the SI, incl. litre) and the definition of the kelvin and degree Celsius.Open

What is the C-reactive protein (CRP) mg/L → mg/dL?

This converter turns C-reactive protein (CRP) in mg/L — the unit used by most European laboratories and in most international literature — into mg/dL, which some labs in Germany, Austria, Turkey and the USA report. The factor is exactly 10, because 1 dL is 0.1 L.

When to use it

Interpreting a mg/L report in a setting where colleagues think in mg/dL
Comparing serial CRP values after a change of laboratory
Reading a mg/L-based study when local results are in mg/dL

When not to use it

hs-CRP for cardiovascular risk assessment, which is conventionally kept in mg/L
Values from point-of-care devices whose unit is not stated — clarify the unit first

How it is calculated

CRP (mg/dL) = CRP (mg/L) ÷ 10

Clinical pearls and limitations

Converts units only; reference ranges depend on the laboratory, the assay and the patient.
mg/dL = mg/L ÷ 10.
Writing 'CRP 40' without a unit is ambiguous: it can mean 40 mg/L or 40 mg/dL, a tenfold difference.
CRP kinetics (rise and fall over days) matter more than a single value; compare serial values only in the same unit.
Interpretation thresholds depend on the clinical question, the guideline and the laboratory.

Frequently asked questions

How do I convert CRP from mg/L to mg/dL?

Divide by 10. Example: 8 mg/L = 0.8 mg/dL; 45 mg/L = 4.5 mg/dL.

What is 100 mg/L CRP in mg/dL?

10 mg/dL.

Why did my CRP suddenly drop tenfold?

If the laboratory changed, check the unit first: a change from mg/L to mg/dL makes the number ten times smaller without any clinical change.

Evidence and guidelines

Primary source: BIPM. The International System of Units (SI), 9th edition, 2019 — Table 8 (non-SI units accepted for use with the SI, incl. litre) and the definition of the kelvin and degree Celsius.

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For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.