BUN Converter

Convert BUN (blood urea nitrogen) between mg/dL and mmol/L instantly with quick reference values.

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How This Tool Works

The BUN Converter changes blood urea nitrogen values between mg/dL and mmol/L. Enter a BUN value and the result updates immediately using the fixed relationship 1 mg/dL = 0.357 mmol/L.

Use the swap control to convert mmol/L back to mg/dL by dividing by 0.357. For example, 10 mg/dL is 3.57 mmol/L, and 7.14 mmol/L is about 20 mg/dL.

  • Input: BUN in mg/dL or mmol/L.
  • Conversion factor: 1 mg/dL = 0.357 mmol/L.
  • Output: Equivalent BUN value in the opposite unit.

Why BUN Units Matter

Laboratory reports may list blood urea nitrogen in different unit systems depending on the country, clinic, or reference source. Converting between mg/dL and mmol/L helps compare a result with the unit used by a chart, study, or healthcare portal.

This tool only converts the numeric unit. It does not interpret whether a result is normal, high, or low, because reference ranges depend on the lab, patient context, hydration, kidney function, medication use, and clinical history.

Common Mistakes to Avoid

  • Do not mix BUN with urea: BUN measures nitrogen content, while some reports list urea. The conversion factor is different.
  • Keep the direction clear: mg/dL to mmol/L multiplies by 0.357; mmol/L to mg/dL divides by 0.357.
  • Do not use this as a diagnosis: discuss lab results and reference ranges with a qualified clinician.

Frequently Asked Questions

Common questions about the BUN Converter

Concentration describes how much of a substance is present in a mixture. It can be expressed as mass/volume (mg/L), molar (mol/L), parts per million (ppm), or percentage.
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Sources & References

International System of Units (SI): amount-of-substance concentration

Amount-of-substance concentration is measured in the mole per cubic metre (mol/m³). Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
→Source: NIST — International System of Units (SI)

International System of Units (SI)

Authoritative definitions for amount-of-substance concentration, from the BIPM SI Brochure (9th edition), the defining reference for the SI.
→Source: BIPM — SI Brochure (9th ed.)

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