Budget Calculator (50/30/20 Rule)
Enter your monthly take-home pay and get exact dollar targets for needs, wants, and savings — the classic 50/30/20 split, or your own percentages.
Your take-home pay — what actually lands in your account
Split
Needs (50%)
$2,500
Housing, groceries, utilities, insurance, minimum debt payments
Wants (30%)
$1,500
Dining out, streaming, travel, hobbies — the good stuff
Savings & debt (20%)
$1,000
Emergency fund, investing, extra debt payments
- Needs$2,50050%
- Wants$1,50030%
- Savings & debt$1,00020%
Yearly: $30,000 needs · $18,000 wants · $12,000 saved
How the 50/30/20 budget works
The 50/30/20 rule divides your after-tax income into three buckets: 50% needs — the bills with real consequences if unpaid; 30% wants — everything that makes life pleasant but optional; and 20% savings and debt payoff — the part that builds your future. Its power is the small number of decisions: three buckets you can hold in your head at the grocery store.
On a $5,000 take-home month, that's $2,500 for needs, $1,500 for wants, and $1,000 saved — $12,000 a year toward an emergency fund, retirement, or extra debt payments. Read the full 50/30/20 guide with worked examples for how to categorize the gray areas.
When to customize the split
The classic ratios assume a mid-cost city and no debt emergency. Adjust when reality differs: high-rent metro — 60/20/20 keeps savings alive while acknowledging housing; aggressive debt payoff — 50/20/30 flips wants and savings until high-interest balances die; catch-up retirement saving — 50/25/25 or leaner. The one non-negotiable: the savings bucket never hits zero, because a budget with no margin fails at the first surprise (that margin is your emergency fund).
From a one-time split to a living budget
A percentage split is the blueprint; the building is watching real transactions land against those targets every month. That's where most spreadsheets die — and where Stoia picks up: connected accounts, AI categorization into your buckets, budgets that roll over, and a shared view for couples budgeting together.
Frequently asked questions
What is the 50/30/20 rule?
A simple budgeting framework popularized by Senator Elizabeth Warren in 'All Your Worth': put 50% of after-tax income toward needs (housing, food, utilities, insurance, minimum debt payments), 30% toward wants, and 20% toward savings and extra debt payoff. It's a starting point, not a law — adjust the percentages to your reality.
Should I use gross or after-tax income?
After-tax (take-home) income. If your employer withholds 401(k) contributions or health premiums, you can add those back mentally to the savings/needs buckets — but the simple version uses whatever hits your bank account.
What counts as a need vs. a want?
A need is something with real consequences if unpaid: rent or mortgage, utilities, groceries, insurance, transportation to work, minimum debt payments. A want improves life but could be cut in a pinch: restaurants, streaming, upgraded phone plans, vacations. The honest test: if you lost your job tomorrow, would you keep paying for it?
What if my needs are more than 50% of my income?
That's common in high-rent cities. Try 60/20/20 or even 70/20/10 as a bridge, and treat the gap as a signal rather than a failure — the long-term fixes are increasing income or reducing the biggest fixed costs (housing, car). Keep some savings percentage, even 5%, to preserve the habit.
Does the 20% include retirement contributions?
Yes — the savings bucket covers emergency fund contributions, retirement investing, and debt payments beyond the minimums. If you have high-interest debt, most of the 20% should attack it first (see our debt payoff calculator).
Is 50/30/20 good for couples?
It works well on combined take-home income — the percentages don't care how many earners there are. The harder part is agreeing on what's a 'want'. Our guide to budgeting as a couple covers systems for that conversation.
Want this to update itself?
Stoia connects your real accounts and keeps the full picture current — net worth, budgets, and goals. Launching in 2026.