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Budget Calculator (50/30/20)

Split your monthly income into needs, wants and savings using the 50/30/20 rule.

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The Budget Calculator (50/30/20) turns Monthly after-tax income into Needs (50%), Wants (30%), Savings (20%), instantly and for free. For instance, with Monthly after-tax income = 3,000 it returns Needs (50%) = $1,500.00, Wants (30%) = $900.00 and Savings (20%) = $600.00.

How to use it

  1. Enter your values: Monthly after-tax income.
  2. Read the result instantly: Needs (50%), Wants (30%), Savings (20%).

Frequently asked questions

How does the Budget Calculator (50/30/20) work?

It takes Monthly after-tax income and derives Needs (50%), Wants (30%) and Savings (20%) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

A single value: Monthly after-tax income. Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Monthly after-tax income = 3,000, the calculator returns Needs (50%) = $1,500.00, Wants (30%) = $900.00 and Savings (20%) = $600.00. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Monthly after-tax income = 3,300 instead, Needs (50%) goes from $1,500.00 to $1,650.00 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Monthly after-tax income = 2,700, Needs (50%) comes out at $1,350.00. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Planning a deposit, a safety net or a large purchase: how much to put aside each month, and how long a target takes at a given rate.

What is the most common mistake?

Reading a nominal rate as if it were real. Inflation is subtracted from the return, not from the capital, so a 3% account during 4% inflation loses purchasing power every year.

What is the difference between the Budget Calculator (50/30/20) and the Savings Goal Calculator?

This one returns Needs (50%) and Wants (30%); the Savings Goal Calculator returns Months to goal and Years to goal. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Savings rate calculator is the closest one after this: Compute what share of your income you save each month.

What else is worth having open alongside it?

Time to reach a savings goal calculator and Life Insurance Calculator (DIME) — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
How-toHow to Budget on an Irregular IncomeA practical method for freelancers and commission earners: baseline on your lowest month, run a buffer account, and pay yourself a steady salary.ExplainerThe 50/30/20 Budget RuleSplit after-tax income into 50% needs, 30% wants, 20% savings. Here's how the buckets work, what counts as each, and how to adapt it to your life.How-toHow Much Life Insurance Do You Need? The DIME MethodSkip the vague rules of thumb. The DIME method — Debt, Income, Mortgage, Education — gives you a defensible number for how much life cover your family actually needs.How-toHow Long to Reach a Savings Goal: A Step-by-Step MethodWork out exactly how many months a savings goal will take from your monthly deposit, starting balance and interest rate — with worked examples.ExplainerWhat Is a Good Savings Rate? Benchmarks and Why It MattersYour savings rate decides how fast you reach financial independence. See how to calculate it, what benchmarks to aim for, and why it beats investment returns.ExplainerNet Worth Benchmarks by Age: How Do You Compare?Median net worth by age band, how to calculate assets minus liabilities, and why the median — not the average — is the fair yardstick to compare yourself to.