Use the popular 50/30/20 budgeting framework to allocate your monthly income. Enter your income and current spending to see how you compare to the recommended split: 50% needs, 30% wants, 20% savings. Customize the percentages for your situation.
The 50/30/20 rule, popularized by Senator Elizabeth Warren and Amelia Warren Tyagi in "All Your Worth," is the most widely used personal budgeting framework in the U.S. for one reason: it's simple enough to actually follow. Allocate 50% of after-tax income to needs (housing, food, transportation, insurance, minimum debt payments), 30% to wants (dining out, entertainment, subscriptions, discretionary purchases), and 20% to savings and debt paydown beyond minimums. Three categories, three percentages, done.
The rule works because it forces the savings number to be a fixed allocation rather than "whatever is left over" (which is usually zero). It also accommodates lifestyle variation — high earners with high "wants" spending are still on track if savings hits 20%, and frugal households with under-50% needs spending have extra flexibility. The trade-offs become explicit: spending more on housing means less for everything else, not just "tighter wants."
This calculator compares your actual spending across needs, wants, and savings to the 50/30/20 target. The output shows where you're over-allocated (e.g., needs at 60% means housing or transportation is squeezing the budget) and where you have flexibility. Use it to design a sustainable monthly plan, to evaluate whether a major lifestyle change (new home, new car, geographic move) fits the budget, or to diagnose why savings are persistently lower than goals.
Take-home: $6,500/month. Target: Needs (50%): $3,250 Wants (30%): $1,950 Savings (20%): $1,300 Actual: Needs: $3,100 (rent $1,800, utilities $200, groceries $400, insurance $300, car payment $400) Wants: $1,650 (dining $400, entertainment $250, hobbies $300, shopping $400, subscriptions $300) Savings: $1,750 (401k $1,000 + Roth IRA $583 + emergency fund $167) Healthy budget. Slightly over-saving, slightly under-spending wants. The kind of margin most planners would love to see.
Take-home: $7,000/month in San Francisco. Actual: Rent + utilities: $3,500 (50% just for housing) Groceries: $500 Transportation: $250 Insurance + medical: $400 Phone + internet: $200 Total needs: $4,850 (69% of income) Wants: $1,200 (17%) Savings: $950 (14%) Total: 100% allocated, but needs are 69% of income — well above the 50% target. The structural issue is housing, not discipline. Either income must rise materially, or housing cost must drop (smaller place, roommates, longer commute, geographic move). Cutting wants further won't fix the underlying problem.
Take-home: $5,500/month. Custom allocation: 40/20/40 (FIRE-style aggressive saving). Target: Needs (40%): $2,200 Wants (20%): $1,100 Savings (40%): $2,200 Actual: Needs: $1,950 (small apartment with roommate, frugal car, low insurance) Wants: $900 Savings: $2,650 (401k max + IRA max + taxable brokerage) This level of savings (48% of after-tax income) is what FIRE math requires for 12–15 year accumulations. Requires deliberate lifestyle design — small apartment, low-cost transportation, modest discretionary spending. Not for everyone, but mathematically powerful when sustained.
Use this calculator at the start of any new financial plan, after major life changes (job, move, marriage, kids), or any time you notice your savings rate drifting lower than you intend. It's also useful as a diagnostic tool when you feel "I can't figure out where my money is going" — concrete categorization usually reveals the answer in minutes.
For couples, run the calculator with combined income and combined spending. The 50/30/20 framework works at any income level — what changes is the absolute dollar amounts in each bucket, not the framework itself. Conversations about "wants" budgets often surface different priorities between partners; the calculator makes those visible.
Pair this with the net-worth calculator (the longer-term view of where the savings goes), the debt-to-income calculator (since debt payments are part of needs), the emergency-fund calculator (a typical first goal for the 20% savings allocation), and the retirement calculators (the long-term destination for most savings).
A reality check: the 50/30/20 rule assumes a baseline level of income above subsistence. For lower-income households (below $40K, varying by location), needs almost always exceed 50% — not from poor budgeting but from absolute cost floors (housing, food, transport, insurance). The solution at that income level is usually income growth, not tighter budgeting. The 50/30/20 framework becomes more useful as a target as income rises into middle-income territory.
For high earners, the temptation is "I make enough that I don't need a budget." The budget calculator is still useful because lifestyle inflation tends to expand discretionary spending to absorb any income, regardless of level. A $500K-income household saving 5% is no better positioned than a $100K household saving 5%, despite earning 5x as much. The 20% savings target applies at every income level.
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Budget Status
Over Budget
Unallocated
$0
Needs
52% / 50%
Savings
16% / 20%