Dilution calculator
For a dilution calculation from initial and target concentration and volume.
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Chemistry calculators
Everyday laboratory arithmetic: molarity from moles or from a mass and a molar mass, percentage and ppm concentration, the C₁V₁ = C₂V₂ dilution rule for concentration per volume, pH and pOH, and the ideal gas law in its available modes. Choose the units shown at the fields and follow the particular model’s assumptions. The calculator converts supported units but cannot recognise a number entered in the wrong unit.
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Dilution calculator
The C₁V₁ = C₂V₂ rule solved for either volume.
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Chemistry calculators
Combined gas law calculator
A gas moving between two states: p₁V₁/T₁ = p₂V₂/T₂.
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Chemistry calculators
Ideal gas law calculator
PV = nRT: the pressure or the volume of a gas from the rest.
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Chemistry calculators
Molar mass calculator
Molar mass from a chemical formula with each element's contribution broken out.
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Chemistry calculators
Molarity calculator
Molar concentration of a solution from moles or from a mass.
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Chemistry calculators
Moles calculator
Moles from a mass and a molar mass, plus the number of particles.
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Chemistry calculators
pH and pOH calculator
pH from hydrogen ion concentration and back, with pOH and the medium.
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Chemistry calculators
Solution concentration calculator
Per cent by mass, mass per volume and parts per million.
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Which calculation to choose
Moles calculator
For mass, molar mass and amount of substance.
What to prepare
For dilution, use concentrations per volume, such as mol/L or g/L, and consistent volume units; for amount of substance, use that substance’s molar mass.
Common mistake
Mass and amount of substance differ. Mass percentages cannot be used directly in C₁V₁ = C₂V₂: use solution masses or convert with density.
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FAQ
Which units should I use?
Use the unit shown or selected for each field. Also distinguish concentration basis: mass per volume, amount per volume and mass fraction are different quantities. Unit conversion does not replace that distinction or a required density.
Why do pH and pOH add up to 14?
The chosen water model at 25 °C uses pKw = 14, corresponding to Kw ≈ 10⁻¹⁴. The pH calculator uses that temperature assumption and, for concentration inputs, a dilute-solution approximation. A sum of 14 is not universal under other conditions.
Do I need a periodic table?
Moles and molarity take a molar mass entered in g/mol. The separate molar-mass tool parses a formula within its stated syntax and element list; it is not an unrestricted database of every substance.
Are real solutions and non-ideal gases handled?
The ideal-gas law uses an ideal model. Volume-based dilution requires a consistent concentration basis and a specified final volume; mass fractions require masses or an appropriate density model. Volume contraction and general non-ideality are not predicted. Check the particular tool’s assumptions.
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