mmol to g Converter
To convert mmol to g, multiply the value in millimoles by the molecular weight (g/mol), then divide by 1,000.
How to Convert mmol to g
Use this mmol to g converter to change millimoles into grams. Enter the amount in mmol and the molecular weight.
Multiply mmol by the molecular weight to get milligrams, then divide by 1,000 to get grams: g = mmol × MW ÷ 1,000.
For example, 250 mmol of glucose (MW 180.156 g/mol) is 250 × 180.156 ÷ 1,000 = 45.039 g.
g = mmol × MW ÷ 1,000Multiply the millimoles by the molecular weight (g/mol), then divide by 1,000 to get grams.Conversion Formula
The formula to convert mmol to g is:
Where:
- mmol = amount in millimoles (10⁻³ mol)
- g = mass in grams
- MW = molecular weight (molar mass) in g/mol
Conversion Table
Common mmol to g conversions are shown below. The last column uses glucose (MW 180.156 g/mol) as an example.
| mmol | g (formula) | g for glucose |
|---|---|---|
| 0.01 | 0.00001 × MW | 0.00180156 |
| 0.1 | 0.0001 × MW | 0.0180156 |
| 0.33 | 0.00033 × MW | 0.05945148 |
| 0.5 | 0.0005 × MW | 0.090078 |
| 1 | 0.001 × MW | 0.180156 |
| 2.5 | 0.0025 × MW | 0.45039 |
| 5 | 0.005 × MW | 0.90078 |
| 10 | 0.01 × MW | 1.80156 |
| 33 | 0.033 × MW | 5.945148 |
| 50 | 0.05 × MW | 9.0078 |
| 100 | 0.1 × MW | 18.0156 |
| 250 | 0.25 × MW | 45.039 |
| 500 | 0.5 × MW | 90.078 |
| 1,000 | 1 × MW | 180.156 |
Worked Examples
Here are some common examples of mmol to g conversion, using glucose (MW 180.156 g/mol):
- 0.180156 g = 1 mmol
- 0.90078 g = 5 mmol
- 5.945148 g = 33 mmol
- 18.0156 g = 100 mmol
Unit Definitions
What is a millimole (mmol)?
A millimole (mmol) is a unit of amount of substance equal to 10⁻³ mole.
The prefix milli- (m) means 10⁻³, or one thousandth. So 1 mmol = 0.001 mol.
What is a gram (g)?
The gram (g) is a unit of mass. It is one thousandth of a kilogram, the SI base unit of mass.
In the lab, grams are used to weigh out chemicals and to state molar mass in g/mol.
Why Is Molecular Weight Needed?
Moles count particles. Grams measure mass. One particle of each substance has its own mass, so the link between them is the molecular weight (MW), also called molar mass.
MW tells you how many grams one mole of a substance weighs. For example, one mole of water weighs about 18.015 g, while one mole of glucose weighs about 180.16 g.
Therefore, to convert mmol to g, you multiply by MW, then divide by 1,000. The extra step (÷ 1,000) only adjusts for the different sizes of the two units.
Uses and Importance of mmol and g
Millimole amounts are common in chemistry and nutrition. Converting them to grams tells you how much material that really is.
Preparing solutions
To make 1 L of a 250 mmol/L glucose solution, you need 250 mmol of glucose, which is about 45 g.
Scaling reactions
Lab recipes in mmol are converted to grams for weighing larger batches.
Nutrition science
Sugar and salt amounts can be compared in mmol and in grams.
Frequently Asked Questions (FAQ)
What is 1 mmol of glucose in grams?
1 × 180.156 ÷ 1,000 = 0.180156 g, or about 0.18 g.
Why divide by 1,000?
mmol × MW gives milligrams. There are 1,000 mg in 1 g, so dividing by 1,000 gives grams.
Is mmol to g the same as mmol/L to g/L?
The maths is the same, but mmol/L and g/L are concentrations. Use the same factor per liter.
Does it matter which form of glucose I use?
Yes. Glucose monohydrate has a higher molecular weight than anhydrous glucose. Use the MW of the form you have.
Can I convert blood glucose with this page?
This page converts amounts, not concentrations. For blood glucose in mmol/L and mg/dL, use this site's main mmol/L to mg/dL calculator.
Other Related Tools
Accuracy and Scope
The result depends on the molecular weight you enter. Check whether your material is anhydrous or a hydrate.
This tool converts amounts only; it is not a blood glucose calculator.
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