Budget Calculator
Allocate your monthly income using the 50/30/20 budgeting rule — split between needs, wants, and savings.
Did this tool work for you?
How to use this calculator
The 50/30/20 rule divides after-tax income into three categories: 50% for essential needs, 30% for lifestyle wants, and 20% for savings and debt repayment.
- 1
Enter your monthly take-home income after taxes.
- 2
Adjust the percentage sliders for needs, wants, and savings (default 50/30/20).
- 3
Review the dollar amounts for each category.
- 4
Make sure the three percentages add up to 100% for a balanced budget.
Frequently asked questions
How are the three amounts calculated?
This tool uses Needs = Income × Needs %, Wants = Income × Wants % and Savings / Debt Repayment = Income × Savings/Debt %, each divided by 100. The three percentages start at 50, 30 and 20 (the figures built into this tool) but every one can be edited.
What if my percentages do not add up to 100?
An extra line appears when the allocated total differs from your income by more than 0.01. If you allocate less it reads Unallocated, and if more it reads Over-allocated by. With $5,200 at 50/30/15 the tool shows $260.00 unallocated, and with $3,000 at 55/35/20 it shows $300.00 over-allocated.
Which income should I enter?
Enter the monthly amount you actually receive after tax and other deductions. The tool does not calculate tax, benefits or deductions, and it does not convert weekly or annual income to monthly.
Does it sort my actual spending into needs and wants?
No. It never sees your expenses. It only divides an income figure into three envelopes using the percentages you set, so comparing real spending against those envelopes is something you do yourself.
What goes in the savings and debt line?
The tool combines savings and debt repayment in one bucket and does not split them. How much of it goes to each is your decision. The label only reflects that this is the portion set aside for the future rather than for current spending.
What happens with a zero or blank entry?
In the calculator form a blank field counts as 0. With 0 income, every amount is $0.00. With 0% in a bucket that bucket is $0.00, and if the three percentages are all 0 the whole income appears as Unallocated.
Is 50/30/20 the right split?
The tool does not say so. It is a starting set of percentages, and the right split depends on your costs and goals. For example, 60/20/20 on $2,750 gives $1,650.00, $550.00 and $550.00. Change the numbers until they describe your own situation.
Budget calculator: splitting monthly income into three envelopes
Three percentages applied to one income
The calculation is a single multiplication per bucket. Income times the needs percentage gives the needs envelope, and the same for wants and for savings and debt repayment. If the percentages total 100, the three envelopes add back to your income. If they do not, the tool shows the difference as either Unallocated or Over-allocated by so the shortfall or surplus is explicit.
Worked example: the built-in split
The figures built into this tool are a $4,000 monthly income divided 50/30/20. Running them gives $2,000.00 for needs, $1,200.00 for wants and $800.00 for savings and debt repayment, with nothing left over. Change the split to 60/20/20 on $2,750 and the envelopes become $1,650.00, $550.00 and $550.00. The example shows how a higher needs share squeezes the other two without changing the total.
Same split, different incomes
The table applies the 50/30/20 percentages to three incomes and a 60/20/20 split to a fourth. Because each envelope is a straight percentage, doubling income doubles every amount, which makes this a quick way to scale a plan up or down.
| Income | Split (needs/wants/savings) | Needs | Wants | Savings / Debt |
|---|---|---|---|---|
| $2,000 | 50/30/20 | $1,000.00 | $600.00 | $400.00 |
| $3,000 | 50/30/20 | $1,500.00 | $900.00 | $600.00 |
| $6,000 | 50/30/20 | $3,000.00 | $1,800.00 | $1,200.00 |
| $2,750 | 60/20/20 | $1,650.00 | $550.00 | $550.00 |
When the percentages do not total 100
Allocate 50/30/15 on $5,200 and the three envelopes are $2,600.00, $1,560.00 and $780.00, leaving $260.00 shown as Unallocated. Allocate 55/35/20 on $3,000 and they are $1,650.00, $1,050.00 and $600.00, which is $300.00 more than the income, so the tool reports Over-allocated by $300.00. Either message is a prompt to adjust a percentage, not an error to ignore.
What the tool does not know
It does not track real spending, categorise transactions, handle irregular income or plan for annual bills. It works on one month at a time and takes the income figure as given. Use the envelopes as targets, then compare them with your own records to see where the plan and the reality differ. A practical routine is to run the calculator again whenever your take-home pay changes, so that each envelope is rebuilt from the new figure instead of being adjusted by feel, and to keep the percentages you chose written down alongside the dollar results.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →