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About

In biochemistry and molecular biology, precision regarding the amount of substance is non-negotiable. Reagents, primers, and antibodies are often quantified in orders of magnitude that differ significantly from stock solutions. The distinction between mmol (millimoles) and μmol (micromoles) represents a factor of one thousand. Miscalculations here lead to failed PCR reactions, wasted expensive reagents, or incorrect patient dosages in clinical settings. This tool addresses the need for bulk data processing, allowing researchers to convert entire columns of spreadsheet data instantly without manual formula entry.

This utility focuses strictly on the amount of substance. It is distinct from Molar (M) concentration calculations. Users must ensure they are converting absolute quantities, not concentrations, to maintain stoichiometry in reaction mixtures. The conversion relies on the metric prefix definitions where m denotes 10−3 and μ denotes 10−6.

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Formulas

The relationship between millimoles and micromoles is linear and based on SI prefixes. To convert from millimoles to micromoles, the value is multiplied by one thousand.

nμmol = nmmol × 1000

Conversely, to convert from micromoles to millimoles, the value is divided by one thousand.

nmmol = nμmol1000

Reference Data

Quantity (mmol)Quantity (μmol)Scientific Notation (mol)
0.00111.0 × 10−6
0.01101.0 × 10−5
0.11001.0 × 10−4
11,0001.0 × 10−3
55,0005.0 × 10−3
1010,0001.0 × 10−2
5050,0005.0 × 10−2
100100,0001.0 × 10−1

Frequently Asked Questions

No. mM (millimolar) and μM (micromolar) are units of concentration (moles per liter). This tool converts mmol and μmol, which are units of absolute amount (mass/molecular weight). While the conversion factor (1000) is numerically identical, the physical application differs.
Copy a single column of numbers from your spreadsheet (excluding headers). Paste them into the input text area. The tool will process each line individually and output a corresponding column that can be pasted back into your software.
No. Because this is a conversion between prefixes of the same base unit (moles), molecular weight is irrelevant. 1 mmol of Hydrogen is 1000 μmol, just as 1 mmol of Protein is 1000 μmol.
The batch processor attempts to parse numbers from each line. If a line is invalid text (like a header), the output for that line will be marked as "Invalid" to preserve row alignment with your original data.