The 50/30/20 rule, in one page
The 50/30/20 budget divides your monthly take-home pay — the money that actually reaches your account, after tax — into three buckets. Needs get 50%: the spending your household cannot skip, such as housing, basic groceries, transport to work, utilities, insurance and minimum debt payments. Wants get 30%: the spending that makes life enjoyable but could be paused — dining out, entertainment, holidays, subscriptions, upgrades. Saving gets 20%: deposits to savings and investments, plus debt payments above the minimums, which belong here rather than in needs because they are building your future rather than servicing the present. This calculator sets the three targets from your income and compares them, line by line, with the actual spending you enter for the biggest categories — so you can see not just whether you match the rule, but exactly which bucket is drifting and by how much. For the income side of the picture, the Salary Calculator converts pay between periods and the Paycheck Calculator estimates take-home pay itself.
The budget targets formula
Wants target = Take-home income × 30% · Saving target = Take-home income × 20%
The percentages apply to take-home pay, not gross salary — budgeting from gross income builds a plan around money that never reaches you. Your actuals are then compared bucket by bucket: a bucket can be under target, which frees money for the others, or over target, which quietly borrows from them.
Worked example with the defaults
Take-home pay of $5,000 gives targets of $2,500 for needs, $1,500 for wants and $1,000 for saving. The default actuals tell a realistic story: rent $1,400, groceries $550 and transport $300 make needs of $2,250 — under target, because this household's housing cost is contained. Dining out $250 and fun $150 make wants of just $400, far under the $1,500 allowance. Saving is $600, under its $1,000 target. Total allocated is $2,250 + $400 + $600 = $3,250, leaving $1,750 unallocated — and that leftover is the most important line on the page. Unallocated income is not saved income; it drifts into untracked spending. This household's real decision is simply to give the leftover a job: raise the saving line toward its target, and the budget is complete.
Needs or wants? The classification is the budget
Most budget arguments are really classification arguments. Groceries are a need, but the premium brands and the takeaway that lands in the grocery bag are wants wearing a need's clothing. A car payment may be a need where no other transport to work exists, while the upgrade to a larger car was a want. The honest test for any line is the emergency test: if income stopped next month, would this spending continue? Rent, basic food, utilities, insurance and minimum payments pass the test. Everything that would be paused belongs in wants, however habitual it feels. This calculator uses three need lines and two want lines as the starting structure — add your remaining spending into whichever bucket passes that test, and the comparison stays truthful.
The limits of 50/30/20 — read these before judging yourself
The rule is a compass, not a law, and it was popularised for a middle-income household in an average-cost area. In an expensive city, needs — housing above all — can consume 60% or more of take-home pay no matter how carefully a household shops, and at lower incomes the fixed cost of simply living takes a larger share still; at high incomes, needs may be only 30%, and saving far above 20% becomes both possible and wise. Debt changes the picture too: minimum payments are needs, but a household clearing expensive debt may sensibly push the saving-and-debt bucket well past 20% for a season. Use the targets here as a diagnostic — they show where your money's shape differs from the classic split — and then set your own percentages deliberately, rather than failing someone else's.
Worked example
On $5,000 take-home pay, the 50/30/20 targets are $2,500 needs, $1,500 wants and $1,000 saving. The default actuals — $2,250 needs, $400 wants, $600 saving — allocate $3,250 and leave $1,750 unallocated, which is money with no job until you assign it one.
How to use this calculator
- Enter your monthly take-home income — what actually lands in your account after tax and deductions.
- Enter your actual needs spending for housing, groceries and transport, adding any other true essentials into the closest line.
- Enter your actual wants spending for dining out and fun, adding subscriptions, holidays and upgrades here.
- Enter what you actually save in a typical month, including debt payments above the minimums.
- Compare each bucket with its target in the table, then deal with the unallocated line first — give every leftover dollar an assignment.
Making the budget survive contact with a real month
A budget built on a typical month fails in the first unusual one, so build the irregular into the plan. Car repairs, annual insurance, school costs, festivals and holidays arrive every year but not every month; divide each yearly cost by twelve and treat that slice as a monthly line, saved into a separate pot, so the unusual month is already funded when it lands. The second survival habit is the order of payments on payday: move the saving line out on the day income arrives, rather than saving whatever survives the month — what survives is, empirically, nothing. A budget is not a prediction of perfect behaviour; it is a set of decisions made once, calmly, instead of hundreds of small decisions made tired.
When needs break the rule
If your needs sit well above 50%, the fix is rarely in the small lines — no amount of grocery discipline outweighs a housing cost that is simply too large for the income, and pretending otherwise only produces guilt, not savings. The honest levers are the big, slow ones: housing, transport and the structure of debts, changed at natural moments such as a move, a lease renewal or a refinancing. Until one of those moments arrives, run a personal split — say 60/25/15 — that sums to your real life, keep the saving line above zero at almost any cost, and revisit the classic targets when the big lines change. A budget you can keep beats a perfect budget you abandon by February.