mol to mg Converter
To convert mol to mg, multiply the value in moles by the molecular weight (g/mol), then multiply by 1,000.
How to Convert mol to mg
Use this mol to mg converter to change moles into milligrams. Enter the amount in moles and the molecular weight of the substance.
First find the mass in grams (moles × molecular weight). Then change grams to milligrams by multiplying by 1,000. In one step: mg = mol × MW × 1,000.
For example, urea has a molecular weight of about 60.056 g/mol. So 0.002 mol of urea is 0.002 × 60.056 × 1,000 = 120.112 mg.
mg = mol × MW × 1,000Multiply the moles by the molecular weight (g/mol), then multiply by 1,000 to get milligrams.Conversion Formula
The formula to convert mol to mg is:
Where:
- mol = amount in moles
- mg = mass in milligrams (10⁻³ g)
- MW = molecular weight (molar mass) in g/mol
Conversion Table
Common mol to mg conversions are shown below. The last column uses urea (MW 60.056 g/mol) as an example.
| mol | mg (formula) | mg for urea |
|---|---|---|
| 0.01 | 10 × MW | 600.56 |
| 0.1 | 100 × MW | 6,005.6 |
| 0.33 | 330 × MW | 19,818.48 |
| 0.5 | 500 × MW | 30,028 |
| 1 | 1,000 × MW | 60,056 |
| 2.5 | 2,500 × MW | 150,140 |
| 5 | 5,000 × MW | 300,280 |
| 10 | 10,000 × MW | 600,560 |
| 33 | 33,000 × MW | 1,981,848 |
| 50 | 50,000 × MW | 3,002,800 |
| 100 | 100,000 × MW | 6,005,600 |
| 250 | 250,000 × MW | 15,014,000 |
| 500 | 500,000 × MW | 30,028,000 |
| 1,000 | 1,000,000 × MW | 60,056,000 |
Worked Examples
Here are some common examples of mol to mg conversion, using urea (MW 60.056 g/mol):
- 60,056 mg = 1 mol
- 300,280 mg = 5 mol
- 1,981,848 mg = 33 mol
- 6,005,600 mg = 100 mol
Unit Definitions
What is a mole (mol)?
The mole (mol) is the SI base unit for amount of substance. It counts particles, such as atoms, molecules or ions.
Since 2019, one mole contains exactly 6.02214076 × 1023 particles. This number is the Avogadro constant.
What is a milligram (mg)?
A milligram (mg) is a unit of mass equal to 10⁻³ gram.
The prefix milli- (m) means 10⁻³, or one thousandth. So 1 mg = 0.001 g.
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 mol to mg, you multiply 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 mol and mg
Small amounts of a chemical are easier to weigh and record in milligrams. This conversion is common in analytical labs and pharmacy work.
Analytical balances
Precision balances usually read in milligrams. Converting a planned amount in moles tells you exactly what to weigh.
Preparing standards
Calibration standards are often made from a few milligrams of pure compound.
Pharmacy and formulation
Drug amounts are commonly written in mg, while chemistry calculations may give moles.
Frequently Asked Questions (FAQ)
Why do I multiply by 1,000 as well as by MW?
MW gives the answer in grams. One gram is 1,000 milligrams, so you multiply by 1,000 to get mg.
How many mg are in 1 mol of urea?
1 × 60.056 × 1,000 = 60,056 mg, which is about 60 g.
Is there a shortcut when the amount is in mmol?
Yes. For mmol, the answer in mg is simply mmol × MW. The two factors of 1,000 cancel out.
What if my molecular weight is given in Da?
For small molecules, the dalton (Da) value and the g/mol value are the same number, so you can use it directly.
Can this give the mass of a gas?
Yes, as long as you know the moles and the molecular weight. It does not depend on the state of matter.
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Accuracy and Scope
The accuracy depends on the molecular weight you enter and on the purity of your material.
Example values are rounded; the converter uses the exact numbers you type.
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