Unit converter

How the unit converter works

Each unit has a fixed factor relative to its base unit: the gram for mass and the litre for volume. The converter multiplies your value by the factor of the source unit and divides by the factor of the target unit: result = value × factor(from) ÷ factor(to).

Factors used

• Mass: 1 g = 1,000 mg = 1,000,000 µg = 1,000,000,000 ng
• Volume: 1 L = 1,000 mL = 1,000,000 µL; 1 mL = 1 cc (cm³)

“mcg” and “µg” are the same unit (microgram). Many labels write mcg because a handwritten µ is easily misread as m, which would be a 1,000-fold error.

Worked examples

1. A 10 mg vial holds 10 × 1,000 = 10,000 µg of material (as labelled, before any net peptide content correction).
2. 0.0025 g = 2.5 mg = 2,500 µg.
3. 0.25 mL = 250 µL, a typical setting for an adjustable pipette.
4. Dividing 5 mg into 10 equal aliquots gives 0.5 mg, or 500 µg, per aliquot.

Why there is no IU conversion

International units measure biological activity, not mass. The factor between IU and mg differs for every substance and sometimes for every batch, so a figure in IU can only be converted with the value stated on that lot's certificate of analysis.

Related calculations

To go from a mass to a molar concentration, use the molarity calculator; for the concentration of a reconstituted vial and the markings on a U-100 scale (1 unit = 0.01 mL, see insulin syringe units), use the reconstitution calculator. Decimal commas and points are both accepted as input.

For laboratory planning with research-use-only materials only.