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CRP unit converter

Convert an existing C-reactive protein result between milligrams per litre and milligrams per decilitre without applying a range or interpreting the result.

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CRP unit converter illustration showing the same concentration across litre and decilitre laboratory volumes

Calculate your result

Enter the numeric result only. Keep the original report, assay name, unit and reference information.

Accepted range: 0 to 1000 mg/L

Your result will appear here

Nothing is saved or added to the URL.

What this result means

One milligram per decilitre equals 10 milligrams per litre. Choose the direction and enter the CRP number from your report; the converter multiplies or divides by exactly 10. [1][2]

How to convert CRP units

To convert CRP from mg/L to mg/dL, divide by 10. To convert mg/dL to mg/L, multiply by 10. One decilitre is one-tenth of a litre, and an official CRP assay document uses the same formula. [1][2]

For example, 1.4 mg/L is 0.14 mg/dL, while 0.14 mg/dL is 1.4 mg/L.

The CRP concentration does not change

A unit conversion changes only how the same mass concentration is written. It does not change the sample, assay result or clinical meaning. [1][2]

Keep the original result and unit. A rounded converted value should not be treated as more precise than the laboratory's reported number.

Standard CRP and hs-CRP use the same unit arithmetic

The factor of 10 is the same when a report says CRP or hs-CRP because the conversion only changes the volume unit. This tool does not decide which assay was performed or apply any assay-specific interpretation.

For CRP and hs-CRP meaning, ranges and clinical context, use the separate LongevityMate C-reactive protein guide. That guide and its interactive result tool own interpretation; this page owns unit conversion only.

Why this tool does not convert CRP to nmol/L

Converting a mass concentration to a molar concentration needs a defined molecular mass. CRP molecular-form and reporting conventions can differ, so this exact mass-unit converter deliberately supports only mg/L and mg/dL.

Do not enter a CRP result reported in nmol/L or another unsupported unit.

Privacy and limitations

The conversion runs locally in your browser. The entered value and result are not placed in the page URL or sent as analytics details.

The calculator cannot check whether the assay or unit was identified correctly, whether the specimen was suitable, or what action a result may require.

Formula and assumptions

Formula
mg/dL = mg/L ÷ 10. mg/L = mg/dL × 10. [1][2]
Version
CRP mg/L and mg/dL conversion, crp-mg-l-mg-dl-conversion-v1
Rounding
Use exact decimal arithmetic with 10 stored as 10/1 and its reciprocal as 1/10, then round the displayed result once to three decimal places. Exact halfway ties round upward in magnitude; a positive value below display resolution uses a less-than result.
Worked example
Example: a report shows CRP of 1.4 mg/L. Divide by 10: 1.4 ÷ 10 = 0.14, so the converted result is 0.140 mg/dL. [1][2]

Who this is for — and when not to use it

Intended use

Neutral unit conversion for a person who already has a standard CRP or hs-CRP mass concentration reported in mg/L or mg/dL.

Not intended for

This tool does not identify an assay, interpret CRP or hs-CRP, apply an inflammation or cardiovascular-risk range, diagnose a condition, compare assays, convert nmol/L or guide symptoms, repeat testing, treatment or prevention.

Exclusions

  • Reference ranges, result bands, cardiovascular-risk categories and diagnosis
  • Distinguishing standard CRP from high-sensitivity CRP or comparing assay methods
  • CRP nmol/L conversion because molecular and assay conventions may differ
  • Symptoms, acute illness, pregnancy, childhood and urgent-care decisions
  • Treatment, prevention and repeat-testing advice
  • Assay quality, specimen suitability and added measurement precision

Evidence sources

  1. 1. Wide Range C-Reactive Protein (wrCRP) assay instructions — Siemens Healthineers. Accessed Aug 28, 2026.
  2. 2. SI prefixes — International Bureau of Weights and Measures. Accessed Aug 28, 2026.