SIMPLE INPUTS. CLEAR RESULTS.
Laboratory concentration calculator
Choose a material, enter the vial mass and target aliquot mass, then compare preparation volumes.
Assumes the water added approximately equals the final solution volume. Results do not account for transfer loss or displacement. Calibrated markings represent volume, not material potency. Displayed values are rounded; calculations use your unrounded inputs.
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How the calculation works
Enter the total material mass in your vial and the amount you have chosen for the calculation. Compare the 1, 2 and 3 mL water options, or type a positive custom water amount. Selecting a material changes its label; it does not set an aliquot mass or choose a preparation volume.
- Concentration
- Vial mass in mg ÷ water volume in mL.
- Aliquot volume
- Target aliquot mass in mg ÷ concentration in mg/mL.
- Scale marking
- Aliquot volume × the selected scale’s units per mL.
For mcg inputs, 1,000 mcg equals 1 mg. Whole-aliquot counts exclude any leftover mass and do not account for transfer loss. A result above the selected calibrated capacity remains visible and is flagged; the calculator does not split the volume into multiple aliquots. This tool performs laboratory preparation arithmetic only; it does not recommend a protocol or provide administration instructions.