Work out solution concentration from mass and volume, the amount of material in any volume, and molar concentration. Lab maths, shown step by step.
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Lab maths only. It does not give, suggest or check any dose.
Concentration = mass ÷ volume. 10 mg of lyophilized material in 2 mL of solvent is 10 ÷ 2 = 5 mg/mL (5,000 µg/mL). The amount in any volume is concentration × volume: at 5 mg/mL, 100 µL (0.1 mL) holds 0.5 mg.
| Material | Solvent | Concentration | Same in µg/mL | In 100 µL |
|---|---|---|---|---|
| 2 mg | 1 mL | 2 mg/mL | 2000 µg/mL | 200 mg |
| 5 mg | 2 mL | 2.5 mg/mL | 2500 µg/mL | 250 mg |
| 10 mg | 2 mL | 5 mg/mL | 5000 µg/mL | 500 mg |
| 10 mg | 3 mL | 3.333 mg/mL | 3333.3 µg/mL | 333.33 mg |
| 15 mg | 3 mL | 5 mg/mL | 5000 µg/mL | 500 mg |
| 5 mg | 5 mL | 1 mg/mL | 1000 µg/mL | 100 mg |
Divide the mass of material by the volume of solvent. 10 mg in 2 mL gives 10 ÷ 2 = 5 mg/mL, which is 5,000 µg/mL.
Multiply the concentration by the volume. At 5 mg/mL, 100 µL (0.1 mL) holds 5 × 0.1 = 0.5 mg, or 500 µg.
Multiply by 1,000. 2.5 mg/mL is 2,500 µg/mL.
Mass concentration divided by molecular weight. mg/mL is the same as g/L, so 5 mg/mL of a 1,419.5 g/mol compound is 5 ÷ 1,419.5 = 0.00352 mol/L, or 3.52 mM.
No. It is a laboratory and teaching tool for solution maths only. It does not give, suggest or check any dose, and research peptides are not for human or animal consumption.
Updated 21 October 2026. Related: Lab handling + storage questions · Testing + certificates