How to Use the Ratio Split Calculator
Splitting a group expense unevenly, dividing business profits by ownership stake, or distributing an inheritance by a specified ratio can all involve fiddly math. This calculator takes a total amount and a ratio (like 3:2:1) and instantly calculates each person's share.
The formula is simple: each share = total × (that part's ratio ÷ sum of all ratio parts). For example, splitting $600 in a 3:2:1 ratio (sum = 6) gives shares of $300, $200, and $100. Enter as many colon-separated parts as you need — there's no limit to how many ways you can split.
You can also use decimal ratios, like 1.5:1:0.5. Because of rounding to the nearest cent, the sum of the calculated shares may differ from the total by a cent or two. In practice, it's common to adjust the largest or last share slightly so everything reconciles exactly.
This works for all kinds of everyday situations: splitting rent by room size, dividing a tip pool by hours worked, sharing a bill among roommates by income, or allocating a bonus pool by contribution score. The ratio numbers themselves don't need to mean anything specific — only their relative size matters, so 30:20:10 produces exactly the same result as 3:2:1.
Frequently Asked Questions
Separate each part with a colon (:). For example, to split among 3 people in a 3:2:1 ratio, enter '3:2:1'. You can add as many parts as you need.
They may be off by a cent or two due to rounding. In practice, it's common to adjust the largest or last share slightly so the total matches exactly.