Monthly Budget Calculator
See exactly where your monthly income goes.
Your monthly numbers
Edit the sample rows to match your own income and spending. Nothing is sent anywhere.
Income
Expenses
Result
Updated instantly as you edit.
Compared with your targets
Where the money goes
Largest expense first.
| Expense | Tag | Amount | % of spending | % of income |
|---|---|---|---|---|
| Rent / mortgage | needs | $1,200.00 | 47.62% | 37.5% |
| Groceries | needs | $420.00 | 16.67% | 13.13% |
| Transport | needs | $180.00 | 7.14% | 5.63% |
| Dining out | wants | $180.00 | 7.14% | 5.63% |
| Hobbies & shopping | wants | $175.00 | 6.94% | 5.47% |
| Utilities | needs | $160.00 | 6.35% | 5% |
| Insurance & health | needs | $140.00 | 5.56% | 4.38% |
| Subscriptions | wants | $65.00 | 2.58% | 2.03% |
12-month projection
Linear only — no interest, inflation or investment return.
| Month | Monthly balance | Cumulative |
|---|---|---|
| 1 | $680.00 | $680.00 |
| 2 | $680.00 | $1,360.00 |
| 3 | $680.00 | $2,040.00 |
| 4 | $680.00 | $2,720.00 |
| 5 | $680.00 | $3,400.00 |
| 6 | $680.00 | $4,080.00 |
| 7 | $680.00 | $4,760.00 |
| 8 | $680.00 | $5,440.00 |
| 9 | $680.00 | $6,120.00 |
| 10 | $680.00 | $6,800.00 |
| 11 | $680.00 | $7,480.00 |
| 12 | $680.00 | $8,160.00 |
How this tool works
- Tag every expense as Needs or Wants. The calculator does not reclassify your entries.
- Savings = income minus expenses. It is not a separate expense line.
- The 50/30/20 comparison uses your own savings target (default 20%).
- The 12-month projection is linear: no interest, inflation or investment return is assumed.
Read the full guides
The step-by-step guides behind this tool, from the Howcompass library.
Questions & answers
Does the 12-month projection include interest?
No. It multiplies the monthly balance by the month number. We have no data about your accounts, so adding a growth rate would be a made-up number.
How is my savings rate calculated?
Income minus all expenses, divided by income, times 100. You can change the savings target to compare your result against a different goal.
Is my budget saved anywhere?
No. The numbers live only in this browser tab and disappear when you close it. Use Export CSV or Print to keep a copy.
Privacy & limits
Your figures stay in this browser tab. Nothing is uploaded, and there is no account sync.
This is arithmetic, not financial advice. For debt, tax or investment decisions, consult a qualified professional.
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