Percentage split calculator
Quick answer
Enter the total and each person's percent. Each person pays the total times their percent divided by 100, so $1,250 at 60 and 40 percent is $750 and $500. The percents should add up to 100. If they do not, the calculator shows how many percent are left to assign or over, and what the shares would be if scaled to 100.
Key points
- Each person pays total × percent ÷ 100. $1,250 at 60 and 40 percent is $750 and $500.
- If the percents add up to 90, 10 percent is left to assign. If they add up to 110, they are 10 percent over.
- Scaling divides by the total of the percents: 60 and 30 on $1,250 becomes $833.33 and $416.67.
- Shares are rounded down to the cent and the leftover cents go to the shares that lost the most, so with 100 percent assigned the shares add up to the total.
On this page
Person 1 pays (60%) $750.00
Person 2 pays (40%) $500.00
Person 3 (not used) $0.00
Person 4 (not used) $0.00
Person 5 (not used) $0.00
Person 6 (not used) $0.00
Shares add up to $1,250
Percents add up to 100%
Percent left to assign 0%
Rounding cents shared out $0.00
Show the formula
- Each person pays = total amount × their percent ÷ 100
- Percent left to assign = 100 minus all the percents added together
- If the percents do not add up to 100, the scaled share = total amount × their percent ÷ all the percents added together
- Shares are rounded down to the cent, and the cents left over go one at a time to the shares that lost the most, so they add up exactly
When should you split by percentage?
Split by percentage when the shares are unequal and you already know what each one is. That covers a 60/40 agreement between two people and roommates paying in proportion to what they earn. For the income case, how to split bills based on income shows how to get the percents, and the income based split calculator does that step for you. More worked splits are in how to split a bill by percentage.
How does the calculator work?
Each person pays the total times their percent, divided by 100. With $1,250, a person at 60 percent pays $1,250 × 60 ÷ 100 = $750, and a person at 40 percent pays $1,250 × 40 ÷ 100 = $500. With three people at 50, 30 and 20 percent, the same $1,250 comes to $625, $375 and $250.
| Person | 60 and 40 split | 50, 30 and 20 split |
|---|---|---|
| Person 1 | $750.00 (60%) | $625.00 (50%) |
| Person 2 | $500.00 (40%) | $375.00 (30%) |
| Person 3 | not in this split | $250.00 (20%) |
| Total | $1,250.00 | $1,250.00 |
Leave a person at 0 if they are not in the split. Up to six people fit, and the same works when the percent comes from something measured, as in rent split by room size, where each room’s share of the square footage is its percent.
What if the percents do not add up to 100?
The calculator shows how many percent are left to assign, and it still gives each person’s share at face value. Say you enter 60 and 30 on $1,250. The shares are $750 and $375, which add up to $1,125, so 10 percent ($125.00) has no owner yet. Either a person is missing or a percent is wrong.
If the two should cover the whole amount in the same proportion, scale the percents. Divide by the total of the percents instead of by 100: $1,250 × 60 ÷ 90 = $833.33 and $1,250 × 30 ÷ 90 = $416.67. The ratio stays 2 to 1, and the percents become 66.7 and 33.3. The calculator prints these scaled shares in the note under the result.
Going the other way, 60 and 50 add up to 110 percent. The shares would be $750 and $625, which add up to $1,375, or $125 over the total. Scaled to 100, they are $681.82 and $568.18.
Why do the shares add up to the cent?
When the percents add up to 100, the shares add up to the total exactly. The calculator rounds every share down to the cent and then hands the leftover cents out one at a time, starting with the share that lost the most in rounding. The “Rounding cents shared out” line shows how many cents moved.
Say $99.99 is split 50, 30 and 20 percent. The exact shares are $49.995, $29.997 and $19.998. Rounded down they are $49.99, $29.99 and $19.99, which add up to $99.97, two cents short. The $19.998 share lost 0.8 of a cent and the $29.997 share lost 0.7, while the $49.995 share lost 0.5. So the two cents go to the second and third shares, and the result is $49.99, $30.00 and $20.00, adding up to $99.99.
Rounding each share to the nearest cent on its own would give $50.00, $30.00 and $20.00, which add up to $100.00. That is one cent too much.
Common mistakes
- Typing 0.6 instead of 60. The boxes take the percent itself, so 60 means sixty percent and 0.6 means six tenths of one percent.
- Dividing by the percent to get a share. $1,250 ÷ 0.6 is $2,083.33, which is not Person 1’s share. Multiply to get a share: $1,250 × 0.6 = $750.
- Leaving a person out and not noticing. A “percent left to assign” above 0 is the sign that the shares do not cover the total.
EvenOut has the same check built in. Choose Percent in the How to split sheet, type each person’s percent, and each dollar share shows under the name, with a status pill that reads “N% left to assign” until it says “Adds up to 100%”. The other methods are laid out in the formulas for splitting bills, and when the shares are better described as weights than percents, the split by shares calculator fits.
Frequently asked questions
How do I enter a percent that is not a whole number?
Type it with one decimal, such as 12.5 or 33.3. The calculator works in tenths of a percent. Three people at 33.3 add up to 99.9, so 0.1 percent is left to assign. Give the extra tenth to one person (33.4) to reach 100.
How do I find the total when I only know one person's share?
Divide the share by their percent written as a decimal. If Person 1 pays $750 and that is 60 percent, the total is $750 ÷ 0.6 = $1,250. To find what percent a share is, go the other way: $750 ÷ $1,250 × 100 = 60 percent.
Can different expenses in the same group use different percents?
Yes. Run the calculator again for each cost with its own percents. In EvenOut the split method is chosen for each expense, so rent can use Percent and groceries can be split equally in the same group.
Keep reading
- Guide How to split a bill by percentage, with examples The formula for splitting a bill by percentage, with three worked splits of $1,250 (60/40, 50/30/20 and 33/33/34) and what to do when percents miss 100.
- Guide How to split bills based on income, with the math Split a bill by income with one formula: bill times your income divided by everyone's income. Worked examples for $1,800 with two and three earners.
- Calculator Income-based split calculator Enter a bill and each person's income to see each share in dollars and percent, and how far it sits from an equal split. Shares add up to the cent.
- Calculator Bill split ratio calculator: split by shares or ratio Enter a total and each person's shares, such as 7, 5 and 3, or a ratio like 3:2:1. See the price of one share and every amount to the cent.
- Guide The formulas for splitting bills, method by method Eight bill splitting formulas with variables, a worked example and a check for each: equal, percent, shares, exact, by item, income, balances and payments.