Convert molarity (mol/L) to mg/mL, or mg/mL back to molarity, using the solute’s molar mass, with M, mM, µM, g/L, and mg/L results.
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M To mg/mL Formula
The following formula is used to calculate the conversion from Molarity (M) to Milligrams per Milliliter (mg/mL).
With MW in g/mol:
With MW in mg/mol:
Here M is molarity in mol/L, and MW is the molar mass of the specified solute form, using the units shown.
To convert molarity to milligrams per milliliter, multiply the molarity in mol/L by the molar mass in g/mol. The result in g/L is numerically equal to mg/mL. Do not divide by solution density; density is not needed for this conversion.
| Molarity | Concentration (mg/mL) |
|---|---|
| 0.1 mM | 0.006 |
| 0.2 mM | 0.012 |
| 0.5 mM | 0.029 |
| 1 mM | 0.058 |
| 2 mM | 0.117 |
| 5 mM | 0.292 |
| 10 mM | 0.584 |
| 20 mM | 1.169 |
| 25 mM | 1.461 |
| 50 mM | 2.922 |
| 75 mM | 4.383 |
| 100 mM | 5.844 |
| 125 mM | 7.305 |
| 150 mM | 8.766 |
| 200 mM | 11.688 |
| 250 mM | 14.610 |
| 300 mM | 17.532 |
| 500 mM | 29.220 |
| 1 M | 58.440 |
| 2 M | 116.880 |
| * Rounded to 3 decimals. Assumes NaCl (MW = 58.44 g/mol). Relationship: mg/mL = M × MW(g/mol). | |
What is M To mg/mL?
M to mg/mL is a conversion from molarity (M) to milligrams per milliliter (mg/mL). Molarity is a measure of the concentration of a solute in a solution, or of any chemical species, in terms of amount of substance in a given volume. Milligrams per milliliter is a measure of the mass concentration of a solution, specifically the mass of solute per volume of solution. Therefore, converting from M to mg/mL involves determining the mass of the solute in milligrams for every milliliter of the solution.
How to Calculate M To mg/mL?
The following steps outline how to calculate the concentration in milligrams per milliliter (mg/mL) using the formula: mg/mL = M × MW, where MW is in g/mol.
- First, determine the molarity (M) in moles per liter.
- Next, determine the molar mass of the exact solute form (MW) in grams per mole.
- Check that M is in mol/L and MW is in g/mol. If MW is in mg/mol, divide it by 1000 first.
- Use mg/mL = M × MW to calculate the concentration in milligrams per milliliter.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Molarity (M) = 0.5 moles per liter
Molar mass (MW) = 100 g/mol
Mass concentration = 0.5 × 100 = 50 g/L = 50 mg/mL. If the stated molar mass were instead 100 mg/mol (0.1 g/mol), the result would be 0.05 mg/mL.
