Calculate concentration, molarity, or molar mass from any two values with unit conversions for mg/mL, mol/L, and g/mol in chemistry.
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Molar To Mg/mL Formula
The calculator converts between molarity, molar mass, and mass concentration. The base units are mg/mL for concentration, mol/L for molarity, and g/mol for molar mass.
C = M * MM
M = C / MM
MM = C / M
- C = mass concentration, in mg/mL
- M = molarity, in mol/L
- MM = molar mass, in g/mol
The calculator uses the fact that 1 mg/mL = 1 g/L. Since mol/L multiplied by g/mol gives g/L, the numeric result is also the concentration in mg/mL.
- To calculate concentration: enter molarity and molar mass. The calculator multiplies them to get mg/mL.
- To calculate molarity: enter concentration and molar mass. The calculator divides concentration by molar mass.
- To calculate molar mass: enter concentration and molarity. The calculator divides concentration by molarity.
Common Unit Relationships for Molarity and mg/mL
These unit relationships are useful when checking inputs or interpreting the result.
| Quantity | Equivalent | Use in this calculator |
|---|---|---|
| 1 mg/mL | 1 g/L | Same numeric value for concentration |
| 1 g/mL | 1000 mg/mL | Concentration conversion |
| 1 mmol/L | 0.001 mol/L | Molarity conversion |
| 1 mol/m³ | 0.001 mol/L | Molarity conversion |
| 1 g/mol | 1 mg/mmol | Same numeric value for molar mass |
Example Calculations
Example 1: Convert molar to mg/mL
You have a 0.5 mol/L solution of a compound with a molar mass of 180.16 g/mol.
C = M * MM
C = 0.5 * 180.16 = 90.08 mg/mL
The concentration is 90.08 mg/mL.
Example 2: Find molarity from mg/mL
You have a concentration of 10 mg/mL and a molar mass of 58.44 g/mol.
M = C / MM
M = 10 / 58.44 = 0.1711 mol/L
The molarity is 0.1711 mol/L.
FAQ
Why is mg/mL equal to g/L numerically?
Because both the mass and volume scale by 1000. One gram is 1000 milligrams, and one liter is 1000 milliliters. So 1 g/L equals 1000 mg per 1000 mL, which is 1 mg/mL.
What molar mass should you enter?
Enter the molar mass of the substance being dissolved, usually in g/mol. For example, sodium chloride has a molar mass of about 58.44 g/mol. If the substance is hydrated, use the molar mass of the hydrated form if that is what you weighed.
Can this be used for mmol/L?
Yes. If your molarity is in mmol/L, the calculator converts it to mol/L before applying the formula. For example, 5 mmol/L is 0.005 mol/L.