# Urea / BUN Unit Converter (BUN mg/dL ↔ Urea mmol/L)

Convert BUN (mg/dL) to/from urea (mmol/L). Factor 0.357 (urea molar mass 60.06, BUN counts 2 N = 28.014). Derived from Young 1987, StatPearls, KDIGO 2012. Not medical advice.

> Canonical page: https://elysiatools.com/en/tools/urea-bun-converter

- **Category:** Health

- **Keywords:** urea converter, bun converter, urea unit, bun unit, blood urea nitrogen, urea, mg dl, mmol l, uremia, azotemia, renal, nephrology, si units, lab medicine

## Overview

Convert a BUN value in mg/dL to urea in mmol/L, or convert urea in mmol/L back to BUN in mg/dL using the factor 0.357. Choose the input and target units, enter a value, and set the desired decimal places. This tool is for unit conversion only and is not medical advice.

## Inputs

- **Value** (number): The BUN (mg/dL) or urea (mmol/L) value to convert.
- **Source Unit** (select): The unit of the input value.
- **Target Unit** (select): The unit to convert into.
- **Decimal Places** (number)

## When to use

- Convert BUN results reported in mg/dL into urea values in mmol/L for SI-unit reporting.
- Convert urea results in mmol/L into BUN values in mg/dL for comparison with conventional US laboratory values.
- Standardize renal laboratory values when reviewing results from sources that use different units.

## How it works

- Enter the numeric laboratory value in the Value field.
- Select the input unit: BUN (mg/dL) or Urea (mmol/L).
- Select the target unit for the conversion.
- Choose the number of decimal places from 0 to 8, then review the JSON result.

## Use cases

- Laboratory result review across regions using conventional mg/dL or SI mmol/L units.
- Nephrology and lab medicine calculations that require BUN and urea values in a consistent unit.
- Checking reported values when comparing clinical references that use different unit systems.

## Frequently asked questions

### What units does this converter support?

It converts BUN in mg/dL and urea in mmol/L in either direction.

### What formula converts BUN to urea?

Urea mmol/L = BUN mg/dL × 0.357.

### What formula converts urea to BUN?

BUN mg/dL = urea mmol/L ÷ 0.357, using an inverse factor of approximately 2.801.

### How many decimal places can I display?

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

### Is this a medical diagnostic tool?

No. It performs unit conversion only and does not provide medical advice or diagnosis.

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