KalkWise
Saving

50/30/20 Budget Calculator

Enter your monthly take-home income and current spending to see your 50/30/20 budget breakdown and surplus or deficit in each category.

Updated June 2026 · Editorial standards

Your Budget

$
$
$
$
Needs Budget (50%)
$3,000
Wants Budget (30%)
$1,800
Savings Target (20%)
$1,200
Needs Surplus / Deficit
-$200
Wants Surplus / Deficit
+$0
Savings Surplus / Deficit
+$700

On $6,000/mo income: target $3,000 needs, $1,800 wants, $1,200 savings. You are on track — $700 above your savings target.The 50/30/20 rule is a guideline, not a law. High cost-of-living cities may require 60% on needs. Adjust percentages to your situation — the key is always to pay yourself first (savings).

By the KalkWise Editorial Team Reviewed for accuracy Updated June 2026

What is the 50/30/20 budget calculator — needs, wants & savings?

In short

The 50/30/20 rule allocates 50% of after-tax income to needs (rent, food, utilities), 30% to wants (dining out, entertainment, subscriptions), and 20% to savings and debt repayment. It's a proven framework for balanced budgeting.

Calculates 50/30/20 budget targets from your income and compares them to your actual spending to show surplus or deficit in each category.

How to use this calculator

  1. 1Enter your monthly after-tax (take-home) income.
  2. 2Enter current spending on needs, wants, and savings.
  3. 3Review your surplus or deficit against the 50/30/20 targets.

The formula

needs=income×0.50
wants=income×0.30
savings=income×0.20
Needs = I × 0.50; Wants = I × 0.30; Savings = I × 0.20; Surplus = Target − Actual
I
— Monthly after-tax income

Worked example

The scenario

$5,000/mo take-home income, currently spending $2,800 needs, $1,800 wants, $400 savings.

gives

The result

Targets: $2,500 needs, $1,500 wants, $1,000 savings. Overspending $300 on needs and $300 on wants, undersaving by $600.

Common use cases

  • Build a simple, sustainable monthly budget.
  • Identify which spending category is most out of balance.
  • Set savings goals aligned with a proven framework.
  • Teach teenagers and young adults personal finance basics.

Limitations & assumptions

  • 50% for needs is impossible in high cost-of-living cities like NYC or SF.
  • Doesn't account for irregular expenses (annual premiums, car repairs).
  • Doesn't differentiate between good debt payoff and consumer debt.
  • Adjust percentages to your situation — the framework is a starting point, not a law.

Frequently asked questions

Senator Elizabeth Warren and her daughter Amelia Warren Tyagi popularized the rule in their 2005 book 'All Your Worth: The Ultimate Lifetime Money Plan.'

Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.