Budget Calculator Online

Split your monthly income into needs, wants, and savings with the 50/30/20 rule, calculated locally in your browser.

The Budget Calculator runs entirely in your browser. Your income and percent figures never leave your device and nothing is uploaded to ArrayKit. Results are estimates only, not financial advice.

Built and maintained by Udit Agarwal

Open the Savings Calculator

About Budget Calculator

The Budget Calculator splits your monthly take-home pay into needs, wants, and savings using the classic 50/30/20 rule — 50% for essentials like rent and groceries, 30% for discretionary spending, and 20% for savings or extra debt payoff. Enter your monthly income and it instantly shows the dollar amount for each bucket, or flip on a custom split to set your own percents when the default rule does not fit your budget. If your percents do not add up to 100, a note flags it so you can adjust. It is handy for building a first budget, checking whether a raise changes your savings rate, or planning around a new expense. These are estimates only, not financial advice — everything computes in your browser and your income figures are never uploaded.

Features

  • Splits monthly income into needs, wants, and savings buckets
  • Uses the 50/30/20 rule by default
  • Custom split lets you set your own needs, wants, and savings percents
  • Flags a split that does not add up to 100%
  • Shows each bucket as a clear dollar amount
  • Copy a plain-text summary of the full breakdown
  • Works with any pay frequency once converted to a monthly figure
  • Runs entirely in your browser with no income data sent anywhere

How to use the Budget Calculator

  1. Enter your monthly take-home income
  2. Review the default 50/30/20 needs, wants, and savings amounts
  3. Turn on a custom split to enter your own percents
  4. Copy the summary to save or share your budget

Example

Input

$5,000/mo (50/30/20)

Output

Needs $2,500 · Wants $1,500 · Savings $1,000

The 50/30/20 rule turns a $5,000 monthly income into three clear spending buckets.

Common errors & troubleshooting

  • Entering annual salary instead of monthly income. — Divide your annual take-home pay by 12 first — the Budget Calculator expects a monthly figure, not a yearly one.
  • Custom percents do not add up to 100%. — The calculator still computes each bucket from the percents you entered, but a warning appears — adjust needs, wants, or savings until they sum to 100 if you want a clean split.
  • Using gross pay instead of take-home pay. — Enter your income after taxes and deductions so the needs/wants/savings amounts reflect what actually hits your bank account.

Frequently asked questions

What is the Budget Calculator's 50/30/20 rule?
It allocates 50% of your monthly take-home income to needs (rent, groceries, utilities), 30% to wants (dining out, hobbies, subscriptions), and 20% to savings or extra debt payoff. The Budget Calculator uses this split by default.
Can the Budget Calculator use percents other than 50/30/20?
Yes. Turn on the custom split toggle to enter your own needs, wants, and savings percents — useful if your rent is higher than 50% or you want to save more aggressively.
What happens if my custom split does not add up to 100%?
The Budget Calculator still computes each bucket from the percents you typed and shows a note so you know the total is over or under 100%, letting you adjust before relying on the numbers.
Should I enter my gross salary or take-home pay?
Use your monthly take-home (after-tax) pay. The Budget Calculator splits whatever number you enter, so a gross figure will overstate how much is actually available to spend or save.
Does the Budget Calculator upload my income figures?
No. The calculation runs entirely in your browser. The income and percents you enter never leave your device and are not uploaded to ArrayKit.
Is the Budget Calculator's output financial advice?
No, it gives estimates only. The 50/30/20 split is a general guideline, not personalized financial advice — check important budgeting decisions with a qualified professional.

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