Budgeting
Savings Goal & Budget Calculator
Enter your take-home pay and spending to see your monthly surplus, how your budget compares with the 50/30/20 rule, and when you reach your savings target.
Calculation inputs
Split spending into fixed line items (rent, insurance, loans) and variable line items (food, fun, travel).
Results
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Complete the fields and select Calculate to show results here.
About this calculator
This calculator finds your monthly savings surplus from your income and expenses, compares your spending pattern against the widely used 50/30/20 budgeting guideline, and estimates when you'll hit a savings goal. It's aimed at anyone building a monthly budget or working toward a specific savings target.
How the calculation works
- Total monthly expenses = fixed line items + variable line items
- Monthly surplus = take-home income − total expenses
- Savings rate % = surplus ÷ income × 100
- Months to reach goal = (target − current savings) ÷ monthly surplus
- 50/30/20 benchmark = 50% of income on needs, 30% on wants, 20% to savings
Notes and assumptions
Fixed line items are treated as needs and variable line items as wants for the 50/30/20 comparison.
Interest or investment returns on your savings are not included, so the goal date is slightly conservative.
How it works in plain English
You enter your monthly take-home income along with fixed expenses (like housing, insurance, and loan payments) and variable expenses (like groceries, transportation, and dining out). The calculator adds these together to find total expenses, then subtracts that from income to find your monthly surplus, which is the amount left over to save.
Your savings rate is calculated as that surplus divided by your income, expressed as a percentage. The calculator also compares your fixed and variable spending against the 50/30/20 rule, a common budgeting benchmark that suggests roughly 50% of income toward needs, 30% toward wants, and 20% toward savings, shown side by side in a chart.
Finally, you enter your current savings balance and a target amount; the calculator subtracts what you already have from the target and divides the remainder by your monthly surplus to estimate how many months it will take to reach your goal, along with a projected date.
The formula
- Total monthly expenses = fixed line items + variable line items
- Monthly surplus = take-home income - total expenses
- Savings rate % = surplus / income x 100
- Months to reach goal = (target - current savings) / monthly surplus
Worked example
Suppose your monthly take-home income is $5,200, your fixed expenses (housing, insurance, loan payments) total $2,450, and your variable expenses (groceries, transport, dining) total $1,310, for total expenses of $3,760.
Your monthly surplus is $5,200 - $3,760 = $1,440, giving a savings rate of about 28%, above the 20% benchmark in the 50/30/20 rule. If your target is $25,000 and you already have $6,000 saved, the remaining $19,000 divided by $1,440 a month means you'd reach the goal in about 14 months. Compared with the 50/30/20 split, your fixed expenses land close to the 50% needs guideline while variable spending runs a bit below the 30% wants share, which is part of why your surplus outpaces the standard 20% savings target. Maintaining this pace would let you reach the goal roughly six months sooner than saving at exactly 20% of income.
The 50/30/20 budgeting rule
| Category | Suggested share of income |
|---|---|
| Needs (housing, utilities, minimum debt payments) | 50% |
| Wants (dining out, entertainment, discretionary spending) | 30% |
| Savings and extra debt payoff | 20% |
A widely cited budgeting guideline; actual needs vary by household and cost of living.
Frequently asked questions
What's the difference between fixed and variable expenses here?
Fixed expenses are recurring costs that stay roughly the same each month, like rent, insurance premiums, and loan payments; they're treated as 'needs' in the 50/30/20 comparison. Variable expenses, like groceries or entertainment, can change month to month and are treated as 'wants' for that comparison, even though some variable spending, like groceries, is also essential.
What if my savings rate is below 20%?
A savings rate below the 20% benchmark in the 50/30/20 rule simply means you're saving less relative to income than that guideline suggests, not that anything is wrong. It's a common reference point, not a requirement, and the right rate depends on your goals, debt, and cost of living.
Does the calculator include investment growth on my savings?
No, the months-to-goal estimate assumes your monthly surplus is simply added to your balance with no interest or investment returns included. If your savings are earning interest, the actual time to reach your goal could be somewhat shorter than the projection shows.
What happens if my expenses exceed my income?
If total expenses are higher than income, the monthly surplus becomes negative, meaning there's no money left to save and the calculator can't project a date to reach your goal. In that situation, expenses would need to decrease or income would need to increase before progress toward the goal is possible.
Is the 50/30/20 rule accurate for every income level?
It's a general guideline rather than a precise rule, and it tends to be harder to hit in high cost-of-living areas where housing alone can exceed 50% of income. It works best as a rough benchmark for comparison rather than a strict target everyone should hit exactly.