Tools
Calculators that show their work
Each tool does one job, refuses incompatible units, and shows the formula, every step and the common ways the arithmetic goes wrong.
Amount ÷ final volume
Concentration calculator
Work out the concentration of a solution from a documented amount of substance and the final total volume.
Amount ÷ concentration
Prescribed amount to volume
Convert an amount your clinician has already prescribed into a volume, using the concentration on the dispensed product's label.
Mass · volume · concentration
Unit converter
Convert between mcg, mg and g; µL, mL, L and U-100 syringe markings; and common concentration units.
Educational, fictional examples
How weight-based formulas work
See the arithmetic behind per-kilogram formulas using fictional numbers. Not for working out real doses.
These tools perform arithmetic only. They never suggest, recommend or validate an amount of any substance.