Frequently Asked Questions
Everything you need to know about the Limiting Reagent Calculator.
How does the limiting reagent calculator work?
Enter a balanced equation and the amount of each reactant; it converts to moles, compares against stoichiometric ratios, and identifies the limiting reactant.
Is it free?
Completely free, no sign-up, downloads, or limits.
Can I enter amounts in grams instead of moles?
Yes, each reactant has its own grams/moles toggle; molar mass is calculated automatically from the formula.
Does it work with more than two reactants?
Yes, any number of reactants in the equation are compared.
What if my equation isn't balanced?
It's flagged clearly rather than silently computed wrong; balance it first with a chemical equation balancer.
Does it calculate theoretical yield?
Yes, for your chosen product, based on the limiting reactant's available moles.
Does it show how much excess reagent is left?
Yes, for every non-limiting reactant, in both grams and moles.
Does it show the steps?
Yes, the full mole conversion and comparison table is shown, not just the final answer.
Is my data stored?
No; everything runs in your browser and isn't stored or sent anywhere.
Does it work on mobile?
Yes, fully responsive on all screen sizes.