Science & Engineering
Molarity and Dilution Calculator
Calculate solution molarity and the final volume needed for a simple C₁V₁ = C₂V₂ dilution. The calculator uses molarity = moles ÷ litres; C₁V₁ = C₂V₂. It returns more than one result so you can check the main answer against a useful secondary measure. Molarity counts moles of solute per litre of final solution, not per litre of solvent added. Volumes may not be perfectly additive, and laboratory preparation requires suitable glassware and safety procedures.
Educational model only. Use applicable standards, calibrated measurements, and qualified review for safety-critical work.
Calculate and compare
Use the number box for precision or the slider for fast scenario testing.
Scenario results
Prepared molarity
0.25 mol/L
Moles divided by final litres.
Dilution final volume
400 mL
From C₁V₁ = C₂V₂.
Diluent to add
300 mL
Assumes additive volumes.
How the calculation works
Use consistent units and retain full precision until the final display step.
Worked example
Reproduce the displayed scenario, then change one assumption at a time.
Assumptions behind the result
- • Inputs use the units shown beside each control.
- • The displayed formula is applied without hidden market or demographic data.
- • Rounding occurs only for display; calculations keep full numeric precision.
- • Molarity counts moles of solute per litre of final solution, not per litre of solvent added.
- • Volumes may not be perfectly additive, and laboratory preparation requires suitable glassware and safety procedures.
Mistakes that change the answer
- • Mixing percentages with decimals or mixing incompatible units.
- • Relying on a rounded intermediate value instead of the full result.
- • Changing several assumptions at once instead of testing solute amount separately.