Simplify two mole amounts into a molar ratio, with per-mole and percentage shares.
Result
How to use this tool
Enter the amount of each substance in moles.
Read the whole-number ratio A : B.
Use “per 1 mol of A” to scale a recipe or reaction.
Compare the ratio with the balanced equation coefficients to spot a limiting reactant.
Formula & worked example
2 mol of A and 3 mol of B give a molar ratio of 2:3.
Limitations — read this before you rely on it
Simplification rounds amounts to three decimal places before scaling, so ratios of amounts known to more precision may round slightly.
Frequently asked questions
The ratio of the amounts, in moles, of two substances in a mixture or reaction.
Both amounts are scaled to whole numbers and divided by their greatest common divisor, so 0.5 : 1.5 becomes 1 : 3.
The coefficients of a balanced equation are the reacting molar ratio; comparing your ratio with them shows which reactant is limiting.
Yes: a zero amount gives a ratio of 1:0 or 0:1, meaning only one substance is present.
No, as long as both amounts are in moles; converting both to another unit leaves the ratio unchanged.