Convert grams to moles and moles to grams using molar mass. Supports all elements and common compounds with an extensive molecular weight database.
The grams to moles calculator converts between mass in grams and amount in moles using the molar mass of any substance. This is one of the most fundamental conversions in chemistry, required for virtually every stoichiometry problem, lab calculation, and reagent preparation.
The relationship is straightforward: moles equal mass divided by molar mass. However, the real challenge lies in knowing the correct molar mass for your substance. This calculator includes a database of common elements and compounds so you can quickly look up molecular weights without consulting a separate periodic table.
Beyond simple conversions, the calculator handles multi-step problems: entering both mass and desired moles to find how much more substance you need, converting between different units (mg, g, kg), and performing batch calculations for multiple substances simultaneously. It also shows the number of particles (atoms or molecules) for each conversion using Avogadro's number.
For best results, combine calculator output with direct observation and periodic check-ins with a veterinarian or qualified advisor. Small adjustments made early usually improve comfort, safety, and long-term outcomes more than large corrective changes made later.
This calculator handles the most common conversion in chemistry instantly and accurately. It eliminates arithmetic errors and includes a compound database so you don't need a separate reference. This grams to moles calculator helps you compare outcomes quickly and reduce avoidable mistakes when making day-to-day care decisions. Use the estimate as a planning baseline and confirm final decisions with a qualified professional when risk is high.
Moles = Mass (g) / Molar Mass (g/mol) Mass (g) = Moles × Molar Mass (g/mol) Particles = Moles × 6.022 × 10²³
Result: 2.000 moles
36.03 g of water (H₂O) divided by its molar mass of 18.015 g/mol gives exactly 2.000 moles. This corresponds to 1.204 × 10²⁴ molecules of water.
The mole is the SI unit for amount of substance, defined as exactly 6.02214076 × 10²³ elementary entities. One mole of any substance contains this exact number of atoms, molecules, ions, or other particles. The mole bridges the gap between the atomic scale and the laboratory scale, allowing chemists to measure out specific numbers of particles using a balance.
Laboratory work frequently requires converting between grams and moles. When preparing solutions, you calculate how many grams of solute to weigh for a desired molarity. In yield calculations, you convert product mass to moles for comparison with theoretical predictions. In analytical chemistry, measured masses are converted to moles to determine empirical and molecular formulas.
Hydrated salts require adding the water of crystallization to the molar mass. For example, copper sulfate pentahydrate (CuSO₄·5H₂O) has MW = 159.61 + 5(18.015) = 249.69 g/mol. Polymers use the monomer molecular weight for mole calculations. For mixtures, calculate moles of each component separately using their individual molar masses.
Add up the atomic masses of all atoms in the formula. For H₂O: 2(1.008) + 16.00 = 18.015 g/mol. Use the periodic table for atomic masses of each element.
They represent the same concept but differ slightly. Molar mass is in g/mol and refers to one mole of substance. Molecular weight is dimensionless and represents mass relative to 1/12 of carbon-12. Numerically they are identical.
Yes. First convert milligrams to grams by dividing by 1000, then divide by the molar mass. This calculator handles the unit conversion automatically.
Moles represent a count of particles. Chemical reactions occur between individual atoms and molecules, so moles let us work with equal numbers of particles regardless of differences in atomic mass.
For molecular hydrogen (H₂, MW = 2.016 g/mol): 1/2.016 = 0.496 moles. For atomic hydrogen (H, MW = 1.008 g/mol): 1/1.008 = 0.992 moles. Always specify which form.
Look up the compound's molecular formula, then calculate the molar mass from atomic masses on the periodic table. This calculator includes common compounds with pre-filled molar masses.