g to mmol Converter
To convert g to mmol, divide the value in grams by the molecular weight (g/mol), then multiply by 1,000.
How to Convert g to mmol
This g to mmol converter changes grams into millimoles. Enter the mass in grams and the molecular weight.
Divide grams by the molecular weight to get moles, then multiply by 1,000 to get millimoles: mmol = g ÷ MW × 1,000.
For example, 10 g of sucrose (MW 342.297 g/mol) ≈ 29.21 mmol.
mmol = g ÷ MW × 1,000Divide the grams by the molecular weight (g/mol), then multiply by 1,000 to get millimoles.Conversion Formula
The formula to convert g to mmol is:
Where:
- g = mass in grams
- mmol = amount in millimoles (10⁻³ mol)
- MW = molecular weight (molar mass) in g/mol
Conversion Table
Common g to mmol conversions are shown below. The last column uses sucrose (MW 342.297 g/mol) as an example.
| g | mmol (formula) | mmol for sucrose |
|---|---|---|
| 0.01 | 10 ÷ MW | 0.02921439569 |
| 0.1 | 100 ÷ MW | 0.2921439569 |
| 0.33 | 330 ÷ MW | 0.9640750576 |
| 0.5 | 500 ÷ MW | 1.460719784 |
| 1 | 1,000 ÷ MW | 2.921439569 |
| 2.5 | 2,500 ÷ MW | 7.303598921 |
| 5 | 5,000 ÷ MW | 14.60719784 |
| 10 | 10,000 ÷ MW | 29.21439569 |
| 33 | 33,000 ÷ MW | 96.40750576 |
| 50 | 50,000 ÷ MW | 146.0719784 |
| 100 | 100,000 ÷ MW | 292.1439569 |
| 250 | 250,000 ÷ MW | 730.3598921 |
| 500 | 500,000 ÷ MW | 1,460.719784 |
| 1,000 | 1,000,000 ÷ MW | 2,921.439569 |
Worked Examples
Here are some common examples of g to mmol conversion, using sucrose (MW 342.297 g/mol):
- 2.921439569 mmol = 1 g
- 14.60719784 mmol = 5 g
- 96.40750576 mmol = 33 g
- 292.1439569 mmol = 100 g
Unit Definitions
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.
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.
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 g to mmol, you divide by MW, then multiply by 1,000. The extra step (× 1,000) only adjusts for the different sizes of the two units.
Uses and Importance of g and mmol
Millimoles give a comfortable number for amounts weighed in grams. They are widely used in lab notebooks and recipes.
Recording reagents
Chemists often note both the mass and the mmol of each reagent to check reaction ratios.
Food science
Sugar amounts in grams can be converted to mmol to compare sweeteners with different molecular weights.
Osmolarity estimates
Converting grams of solute to mmol is the first step toward estimating osmotic strength.
Frequently Asked Questions (FAQ)
How many mmol are in 1 g of sucrose?
1 ÷ 342.297 × 1,000 ≈ 2.921 mmol.
Why use mmol instead of mol?
Gram amounts of most substances are fractions of a mole. mmol gives whole numbers that are easier to read.
What is the molecular weight of sucrose?
Sucrose is C₁₂H₂₂O₁₁. With standard atomic weights, its molecular weight is about 342.297 g/mol.
Is g to mmol the same as mg to µmol?
Yes. Both steps change by the same factor of 1,000, so the number is the same.
Can I use this for any substance?
Yes, as long as you know its molecular weight.
Other Related Tools
Accuracy and Scope
The result depends on the molecular weight and purity of your material.
Example values are rounded to four significant figures.
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