CRP mg/L To mg/dL Converter

Convert C-reactive protein results between mg/L and mg/dL, including optional reference range conversion for standard CRP and hs-CRP reports.

CRP Result

Value CRP value Enter the number from the laboratory report. Conversion direction mg/L is common in UK reports. mg/dL appears in some older or overseas material.

Report type CRP test type The unit factor is the same, but standard CRP and hs-CRP are used for different clinical questions. Decimal places Use one or two decimals for mg/dL; mg/L is often shown as whole numbers.

Optional reference range Range lower limit Optional. Enter in the same starting unit as the CRP value. Range upper limit Optional. Enter in the same starting unit as the CRP value.

Converted CRP

CRP in mg/dL–Enter a CRP value to convert.

This converter changes units only. It does not identify infection, inflammation, cardiovascular risk or treatment need.

What This Converter Does

C-reactive protein, usually written as CRP, may be reported in milligrams per litre or milligrams per decilitre. Because one litre is ten decilitres, the conversion is simple: mg/dL is one tenth of mg/L, and mg/L is ten times mg/dL. This page performs that conversion and can also convert optional range limits.

The page is intended for unit handling, not medical interpretation. CRP can be ordered for many reasons, and high-sensitivity CRP is a different style of test from standard CRP even though the unit conversion is the same. The report, sample date, symptoms, treatment plan and laboratory comments matter more than the converted unit alone.

Formula

mg/dL = mg/L / 10mg/L = mg/dL x 101 litre = 10 decilitresThe mass unit, milligram, is unchanged; only the volume denominator changes.

The conversion does not depend on molecular weight because both units are mass concentration units. The only change is the volume below the fraction: litre versus decilitre.

Quick Conversion Table

mg/L	mg/dL	Unit note
0.5	0.05	Divide by 10.
1	0.10	Same mass concentration in another unit.
2	0.20	Often seen in hs-CRP contexts.
5	0.50	Use the report range.
10	1.00	Easy anchor value.
50	5.00	Clinical meaning needs context.
100	10.00	Do not judge from conversion alone.

Worked Examples

mg/L To mg/dL

A CRP result of 10 mg/L converts to 1.00 mg/dL. The result is the same concentration, written with a different volume unit.

mg/dL To mg/L

A value of 2.5 mg/dL converts to 25 mg/L. Multiply by 10 when moving from mg/dL to mg/L.

hs-CRP Report

An hs-CRP value of 2 mg/L converts to 0.20 mg/dL, but the clinical use of hs-CRP is not the same as a standard CRP check.

How To Copy CRP Results Safely

When copying a CRP result, keep the unit next to the number and include whether the test was standard CRP or hs-CRP. If you are sending the result to a clinician, include the date, laboratory name, reference interval, symptoms and the reason the test was ordered if known. A converted value without the original unit can create mistakes, especially because 10 mg/L and 10 mg/dL are ten-fold apart.

CRP can change over time, so a single converted number is not a trend. If several results are being compared, convert all of them into the same unit and keep the collection dates visible.

Common Errors To Avoid

Reading mg/dL as if it were mg/L.
Mixing standard CRP and hs-CRP results without labelling the test type.
Using a reference interval from another laboratory.
Converting the value but forgetting to convert the range.
Drawing conclusions about infection or inflammation from a unit conversion page.

A ten-fold unit mistake can be hard to spot if the unit is missing. When copying into an email, spreadsheet or patient portal message, write the unit after every CRP number. If you convert a table, add a column note such as “all values converted to mg/L” so older mg/dL entries are not mixed back in later.

Standard CRP And hs-CRP

Standard CRP and high-sensitivity CRP can share the same mass concentration units, but they are ordered for different reasons and may have different report wording. Do not convert an hs-CRP number and then compare it with a standard CRP comment without checking the test type. If a result is part of cardiovascular risk assessment, infection monitoring, inflammatory disease follow-up or post-operative care, the clinician’s reason for ordering the test matters.

If several CRP results are being trended over time, convert them into one unit before plotting. Keep dates and clinical notes visible beside the numbers, because CRP can change quickly and timing may affect how a trend is read.

Be especially careful when a guideline, letter or article mentions a threshold. A threshold written in mg/L must be converted before it is compared with a result in mg/dL. The same warning applies to copied reference intervals and chart labels.

FAQs

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

Divide mg/L by 10. For example, 10 mg/L is 1.00 mg/dL.

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

Multiply mg/dL by 10. For example, 1 mg/dL is 10 mg/L.

Does this work for hs-CRP?

The unit conversion is the same, but hs-CRP is used differently from standard CRP. Keep the test type label.

Can this tell me what my CRP result means?

No. It changes units only. Ask the clinician who requested the test about interpretation.

Why is the conversion exactly ten?

Because one litre contains ten decilitres, and the milligram part does not change.

Sources

Lab Tests Online UK. (2026). C-reactive protein test. The Association for Laboratory Medicine. https://labtestsonline.org.uk/tests/c-reactive-protein-crp
MedlinePlus. (2026). C-reactive protein (CRP) test. U.S. National Library of Medicine. https://medlineplus.gov/lab-tests/c-reactive-protein-crp-test/
Unified Code for Units of Measure. (2024). UCUM specification. Regenstrief Institute. https://ucum.org/ucum
National Institute of Standards and Technology. (2008). Guide for the Use of the International System of Units (SI), Special Publication 811. NIST. https://www.nist.gov/pml/special-publication-811