Molecular Weight Calculator

Calculate the molecular weight of any chemical formula.

Chemical Formula

You might also need

Guides & Reference

How It Works

Calculate the molecular weight of any chemical formula. Enter your values and press Calculate for instant results with a full formula breakdown.

Formula

Sum of atomic weights

Common calculations — results you can verify instantly.

H₂O

2×1 + 16

18 g/mol

NaCl

23 + 35.5

58.5 g/mol

CO₂

12 + 2×16

44 g/mol

Exponential Growth Calculator

Calculate exponential growth or decay over time.

Half-Life Calculator

Calculate radioactive decay and remaining quantity.

Grade Calculator

Calculate your final grade from assignments and weights.

Fuel Cost Calculator

Estimate the total fuel cost for any trip based on distance, fuel price and efficiency.

Gas Mileage Calculator

Calculate MPG from miles driven and gallons used.

Mileage Calculator

Calculate mileage reimbursement for business driving.