Chemistry Calculator: How to Calculate Molar Mass, Dilution, and Reaction Yield for Lab and Study

Calculating molar mass, figuring out dilutions, and estimating reaction yield are fundamental chemistry tasks that come up in labs, classrooms, and even home brewing or gardening. Whether you are a student preparing for a test or a professional running experiments, having the right formulas and a reliable calculator saves time and reduces errors.

Use the Chemistry Calculator to compute molar mass, dilution ratios, reaction yield, and more instantly in your browser.

How to Calculate Molar Mass

Molar mass is the mass of one mole of a substance (in grams per mole). To calculate it:

Find the atomic mass of each element from the periodic table
Multiply by the number of atoms of that element in the compound
Add all the results together

Example: Water (H₂O)
Hydrogen: 1.008 × 2 = 2.016
Oxygen: 16.00 × 1 = 16.00
Total: 18.016 g/mol

Compound	Formula	Molar Mass
Carbon Dioxide	CO₂	44.01 g/mol
Sodium Chloride	NaCl	58.44 g/mol
Glucose	C₆H₁₂O₆	180.16 g/mol
Sulfuric Acid	H₂SO₄	98.08 g/mol

How to Calculate Dilutions

The dilution formula is C₁V₁ = C₂V₂, where C is concentration and V is volume. To dilute a stock solution:

Example: You have a 5M NaCl stock solution and need 500 mL of 0.5M NaCl.
C₁ = 5M, V₁ = ?, C₂ = 0.5M, V₂ = 500 mL
V₁ = (C₂ × V₂) / C₁ = (0.5 × 500) / 5 = 50 mL
Add 50 mL of stock to 450 mL of water.

How to Calculate Reaction Yield

Percent yield tells you how efficient your reaction was:

Percent Yield = (Actual Yield / Theoretical Yield) × 100%

If you expected 10 grams of product but only recovered 7.5 grams, your yield is (7.5/10) × 100% = 75%. Yields below 100% are normal due to side reactions, incomplete reactions, and loss during purification.