Worked example
Rent of 2,100 from a 2,200 paycheck
The example in the calculator: 2,200 every two weeks, split 70/20/10, with rent of 2,100.
Each paycheck puts 1,540 in living costs. The bills are rent of 2,100 due on the 1st, car insurance of 180 on the 28th, plus a phone and internet. They come to 2,430 a month, and a typical month brings about 3,337, so 70% covers them.
Rent and car insurance both fall to the October 23 paycheck. That's 2,280 of bills for 1,540 of living-costs money: 740 short.
So the October 9 paycheck, which only has 150 of bills, holds back 740 for the 23rd. The other 650 is free for groceries and everyday spending.
The 70/20/10 example's paydays in October 2026| Payday | Living costs | Bills | Result |
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| Oct 9 | 1,540 | 150 | Hold back 740 · 650 free |
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| Oct 23 | 1,540 | 2,280 | Short by 740 |
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