How to split a bill by percentage, with examples

What is the formula for splitting by percentage?

Each person’s share is the total times their percent, divided by 100. For a $1,250 bill, a person at 60 percent pays $1,250 times 60 divided by 100, which is $750. The same formula works for every person, and the shares always add back to the total when the percents add to 100.

What do three splits of $1,250 look like?

Three common patterns on the same bill show the formula at work.

Split	Percents	Dollar shares
Two people	60 / 40	$750 / $500
Three people	50 / 30 / 20	$625 / $375 / $250
Three, near-equal	33 / 33 / 34	$412.50 / $412.50 / $425.00

Check each row. $750 + $500 is $1,250. $625 + $375 + $250 is $1,250. $412.50 + $412.50 + $425.00 is $1,250. The 33/33/34 split shares a bill three ways in whole percents, because a third is 33.33 percent and the three whole numbers still have to reach 100.

How do you turn a ratio into percentages?

Add the parts of the ratio, then divide each part by the total. A 3 to 2 ratio has 3 + 2 = 5 parts. Three parts is 3 divided by 5, which is 60 percent, and two parts is 40 percent. A 5 to 3 to 2 ratio has 10 parts, so it becomes 50, 30 and 20 percent. A 1 to 1 to 2 ratio has 4 parts, so it becomes 25, 25 and 50 percent.

Some ratios do not divide into whole percents. A 2 to 1 ratio is 66.67 and 33.33 percent. For those, use shares or exact amounts, which avoid rounding the percents. At 2 shares to 1, a $1,250 bill is $833.33 and $416.67.

What if the percents add to 99 or 101?

The bill will not add up, and the gap is exactly the missing or extra points. On $1,250, one percentage point is $12.50.

• 99 percent. Say a three-way split is typed as 33/33/33. The shares come to $1,237.50, which is $12.50 short. Raise one person to 34.
• 101 percent. Say it is typed as 34/34/33. The shares are $12.50 over the bill. Lower one person by a point.

In EvenOut, a Percent split typed as 33/33/33 shows “1% left to assign”. The pill changes to “Adds up to 100%” once the percents are right, and it does not read that way while they are off.

How do you find what percent a share is?

Divide the person’s amount by the total, then multiply by 100. This is the reverse of the formula and the quickest way to turn a dollar agreement into percents. If one person agreed to pay $375 of the $1,250, that is 375 divided by 1,250, or 0.30, which is 30 percent. Use it to check your percents against an amount that was agreed in dollars.

When is another method better?

Percent is the right tool when the split is a ratio you can say in whole numbers. Other methods fit better in three cases:

• The ratio is not whole. Use shares for 2 to 1, or exact amounts when you have the dollar figures.
• The difference is a count. Use shares when people stayed different numbers of nights, as in the split by shares calculator.
• Each amount is already on a bill. Use exact amounts, since there is nothing to calculate.

For income-based splits, how to split bills based on income shows the formula for turning pay into percents.

How do you split by percent in EvenOut and Splitwise?

In EvenOut, tap “Add expense”, enter the amount and open the split chip. In the “How to split” sheet choose “Percent”, then type each person’s percent. Each person’s dollar share appears under their name, and a status line reads “N% left to assign” until the percents add up, then “Adds up to 100%”. You can use Percent for one expense and a different method for the next.

As of October 2026, Splitwise calls the same option “By percentage”. Its split options start from tapping “equally” in the “Paid by [you] and split [equally]” line of the add expense form.

What to do next

Write down the percents and the total, apply the formula, and make sure the shares add back to the bill. For a quick check on your own numbers, the percentage split calculator does the arithmetic, and the formulas for splitting bills page puts every method side by side. If you are still choosing a method, how to split expenses walks one bill through all five.