🧪 Lab Prep Calculator

Quick solution-prep math — results update as you type. Nothing here is saved.

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grams = molarity × volume(L) × molar mass

Molarity (mol/L)

Molar mass (g/mol)

Final volume

Unit

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Enter molarity, molar mass & volume.

C₁V₁ = C₂V₂ → V₁ = C₂V₂ / C₁

Stock conc. (C₁)

Desired conc. (C₂)

Final volume (V₂)

Unit

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C₁ and C₂ use the same units (M, %, g/L…).

M = (mass / molar mass) / volume(L)

Mass (g)

Molar mass (g/mol)

Volume

Unit

—

Enter mass, molar mass & volume.

grams = (% ÷ 100) × volume(mL)

Percent (% w/v)

Final volume (mL)

—

e.g. 0.9% saline in 1000 mL.

mass = moles × molar mass

Molar mass (g/mol)

Mass (g)

Moles (mol)

Enter molar mass, then type in either mass or moles.

Tip: molar masses come from the periodic table (e.g. NaCl = 58.44 g/mol, glucose = 180.16 g/mol).