Budget Calculator (50/30/20)
Split your monthly income into needs, wants and savings with the 50/30/20 rule.
Results update as you type.
About this calculator
The 50/30/20 rule is a simple budgeting framework: put 50% of your after-tax income toward needs, 30% toward wants and 20% toward savings and debt repayment. This budget calculator splits your monthly income into those three buckets — and lets you adjust the percentages — so every dollar has a clear monthly and yearly target.
The maths is just three shares of your take-home pay. On 4,000 a month, the default split is 2,000 for needs, 1,200 for wants and 800 for savings; the tool also shows each bucket as a yearly figure (24,000, 14,400 and 9,600). Change the percentages and the amounts update instantly, so you can model a tighter savings target or a higher needs share.
Use it to build a starter budget, to check how your current spending compares with the 50/30/20 guideline, or to set a savings goal you can actually fund. Needs are essentials you cannot skip, wants are lifestyle extras, and the savings bucket covers both building wealth and paying down debt beyond the minimums.
Frequently asked questions
What counts as a need versus a want?
Needs are essentials you cannot skip — rent or mortgage, utilities, groceries, insurance, minimum debt payments and transport to work. Wants are lifestyle extras like dining out, streaming, hobbies and holidays.
What if my needs are more than 50%?
In high-cost areas needs often exceed 50%. Treat 50/30/20 as a target, not a rule: trim the wants bucket first, and aim to keep saving at least something even if the savings share has to drop below 20% for now.
Should the 50/30/20 rule use gross or net income?
Net (after-tax) income — the money that actually lands in your account. Because tax and payroll deductions are already taken out, applying the 50/30/20 split to take-home pay gives realistic bucket amounts you can spend and save.
Does debt repayment count as a need or savings?
Minimum required payments count as needs, since you must make them, while any extra you put toward paying debt down faster comes from the 20% savings-and-debt bucket. That is why the savings share doubles as a debt-payoff fund.
What if I want to save more than 20%?
Raise the savings percentage and lower wants (or needs) to match — the shares just have to add to 100%. Many people chasing early retirement or a big goal push savings to 30% or more by trimming the wants bucket.
Is 50/30/20 realistic in a high-cost city?
Often needs alone exceed 50% where rent is high, so treat the split as a target. Cut the wants share first, keep saving something even if below 20%, and use the adjustable percentages here to build a split that fits your real costs.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/budget/curl
curl "https://calculator.free/api/v1/budget/?income=4000"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/budget/?" + new URLSearchParams({
"income": "4000"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.