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Calcium Unit Converter (mg/dL ↔ mmol/L)

· Last updated：2026-08-13

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Convert total serum calcium between mg/dL and mmol/L. Factor 0.25 (atomic weight 40.078; × 4.0 inverse). Does not albumin-correct. Derived from Payne 1973, Young 1987, StatPearls, Endocrine Society. Not medical advice.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Health
Input types
number, select
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert measured total serum calcium between mg/dL and mmol/L using the fixed factor 0.25, with the inverse conversion using ×4.0. Choose the input and target units, enter a value, and set the desired decimal places. This tool does not albumin-correct calcium and is not medical advice.

When to use

  • Convert a laboratory calcium result from mg/dL to mmol/L for SI-unit reporting.
  • Convert a calcium result from mmol/L to mg/dL when reviewing conventional lab units.
  • Standardize total calcium values for lab medicine, endocrinology, or clinical documentation.

How it works

  1. 1Enter the measured total calcium value.
  2. 2Select the source unit: mg/dL or mmol/L.
  3. 3Select the target unit: mg/dL or mmol/L.
  4. 4Choose between 0 and 8 decimal places, then review the converted result and metadata.

Use cases

  • Translate calcium results between conventional and SI units when comparing laboratory reports.
  • Prepare total calcium values for clinical notes, research records, or endocrine documentation.
  • Quickly check whether a reported calcium value has been converted correctly.

Examples

1. Convert a normal total calcium result

Laboratory professional

Background

A lab report lists total calcium as 9.5 mg/dL, but the receiving record uses mmol/L.

Problem

The result needs to be converted without changing the measured value or applying albumin correction.

How to use

Enter 9.5 as the value, select mg/dL as the source unit, select mmol/L as the target unit, and keep decimal places at 2.

value: 9.5; sourceUnit: mg/dL; targetUnit: mmol/L; decimalPlaces: 2

Outcome

The converter returns 2.38 mmol/L using the formula mmol/L = mg/dL × 0.25.

2. Convert a high calcium result to mg/dL

Clinician

Background

A laboratory result is reported as 3.5 mmol/L, while the clinical reference material uses mg/dL.

Problem

The value must be expressed in the alternate unit for comparison and documentation.

How to use

Enter 3.5 as the value, select mmol/L as the source unit, select mg/dL as the target unit, and use 2 decimal places.

FAQ

What calcium units does this converter support?

It converts total serum calcium between mg/dL and mmol/L.

What conversion factor is used?

The conversion from mg/dL to mmol/L uses 0.25. The inverse conversion divides by 0.25, equivalent to multiplying by 4.0.

Does this tool correct calcium for albumin?

No. It converts the measured total calcium value only and does not perform albumin correction.

How many decimal places can I choose?

You can select from 0 to 8 decimal places. The default is 2.

Is this calcium converter medical advice?

No. Use the result as a unit conversion and consult a qualified healthcare professional for interpretation.

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value: 3.5; sourceUnit: mmol/L; targetUnit: mg/dL; decimalPlaces: 2

Outcome

The converter returns 14.0 mg/dL using the inverse factor of 4.0.