Science calculator
Molar Mass Calculator
Calculate molar mass from a chemical formula.
About the molar mass calculator
The molar mass calculator computes the molar mass of a compound from its chemical formula.
How to use this calculator
- 1
Enter chemical formula
Enter the formula (e.g., H2O, CO2, NaCl).
- 2
View results
See the molar mass in g/mol with element breakdown.
How the calculation works
Sums atomic masses: H=1.008, C=12.011, O=15.999, N=14.007, etc.
Example: H₂O: 18.015 g/mol. CO₂: 44.01 g/mol.
Understanding scientific constants
Key constants used: g = 9.81 m/s² (Earth gravity), c = 299,792,458 m/s (speed of light), G = 6.674×10⁻¹¹ N·m²/kg² (gravitational constant), h = 6.626×10⁻³⁴ J·s (Planck's constant), R = 8.314 J/(mol·K) (ideal gas constant). Results assume ideal conditions — real-world measurements may vary.
Ideal vs. real-world conditions
Most physics calculators assume ideal conditions: no air resistance, perfect vacuums, uniform gravity. Real-world results will differ due to friction, air resistance, temperature variations, and measurement uncertainty. Use these tools for learning and estimation, not precision engineering.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about molar mass calculator
How accurate is the molar mass calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.