Chemistry Calculator
Your starting point for quantitative chemistry calculations. Enter any chemical formula to find its molecular weight — the essential value for stoichiometry, molarity, solution preparation, percent yield, and gas law calculations. This chemistry calculator uses IUPAC 2021 standard atomic weights and provides molecular weight with full element breakdown.
Enter a chemical formula above to calculate molecular weight
Molecular Weight for Chemistry
Every chemistry calculation starts with knowing the molecular weight.
Molecular weight is the gateway to quantitative chemistry. To convert grams to moles (n = m/M), calculate molarity (M = n/V), or determine theoretical yield — you need the molecular weight of every reactant and product.
This chemistry calculator provides the molecular weight instantly from any chemical formula. Type NaHCO₃ and get 84.007 g/mol. Now you can calculate: 8.401 g of baking soda = 0.100 mol, which in 500 mL water gives 0.200 M NaHCO₃.
The calculator handles organic compounds, inorganic salts, acids, bases, and complex coordination compounds — everything you encounter in general chemistry, organic chemistry, analytical chemistry, and biochemistry.
Elements for Chemistry Calculations
Atomic weights of elements commonly used in chemistry problems.
Chemistry calculations use elements across the entire periodic table. The most common in general chemistry are the "big six" of organic chemistry (C, H, N, O, S, P) plus common inorganic elements (Na, Mg, Cl, K, Ca, Fe).
Knowing approximate atomic weights helps estimate answers: C≈12, H≈1, O≈16, N≈14, Na≈23, Cl≈35.5. Quick check: NaCl ≈ 23+35.5 = 58.5 g/mol (exact: 58.443).
Explore the element cards for precise IUPAC atomic weights used in the calculations.
Chemistry Calculator: From Formula to Solution
Three steps from formula input to chemistry problem solving.
Enter Any Chemical Formula
This chemistry calculator starts with molecular weight computation — the foundation of quantitative chemistry. Enter any formula to calculate the molecular weight, which you'll need for stoichiometry, molarity calculations, solution preparation, and yield determination. All 118 elements are supported.
Chemistry Calculation Examples
Click any compound to load it and see how its MW applies to chemistry problems.
Chemistry Calculator FAQ
How molecular weight connects to stoichiometry, molarity, and more.