Speedy Calculator

50/30/20 Rule Calculator

Finance Updated October 25, 2026

Quick answer

The 50/30/20 rule calculator splits your after-tax income into 50% for needs, 30% for wants and 20% for savings and debt repayment – and compares the targets with what you actually spend.

$
%
%
$
$
Needs (monthly)
$ —
Wants (monthly)
$ —
Savings and debt repayment (monthly)
$ —
What's left to save with your actual spending
$ —
Your actual savings rate
— %
Yearly savings target
$ —

The 50/30/20 budget was popularised by Senator Elizabeth Warren in “All Your Worth”. It is a simple starting point: in high-cost cities needs may take more than 50%, so adjust the percentages if necessary.

How to use the 50/30/20 Rule Calculator

  1. After-tax income
  2. Needs share
  3. Wants share
  4. Your actual monthly needs
  5. Your actual monthly wants

Results update as you type, and every field accepts the units shown in its menu.

How it works

Enter your after-tax income (choose the period) and, optionally, what you actually spend on needs and wants.

Tips

  • Use your real spending from bank statements rather than guesses.
  • Automate savings so they happen before you spend.
  • Revisit your plan once a year or after any big life change.
  • Keep an emergency fund before investing for long-term goals.

Common mistakes to avoid

  • Underestimating irregular expenses such as car repairs, gifts and annual bills.
  • Ignoring inflation for long-term goals.
  • Taking on high-interest debt to fund wants.

Inputs explained

Field What to enter
After-tax income Units: per month, per year, per week, every two weeks
Needs share In %
Wants share In %
Your actual monthly needs Amount in your currency
Your actual monthly wants Amount in your currency

What each result means

  • Needs (monthly) = [After-tax income]×[Needs share]÷100
  • Wants (monthly) = [After-tax income]×[Wants share]÷100
  • Savings and debt repayment (monthly) = [After-tax income]×(100 – [Needs share] – [Wants share])÷100
  • What’s left to save with your actual spending = [After-tax income] – [Your actual monthly needs] – [Your actual monthly wants]
  • Your actual savings rate = ([After-tax income] – [Your actual monthly needs] – [Your actual monthly wants])÷[After-tax income]×100
  • Yearly savings target = [After-tax income]×(100 – [Needs share] – [Wants share])÷100×12

Example values

How the main result changes when After-tax income changes and everything else stays at the example values above:

After-tax income (per month) Needs (monthly)
2,250 1,125
3,375 1,687.5
4,500 2,250
5,625 2,812.5
6,750 3,375
9,000 4,500

Formula

Needs = 50% × after-tax incomeWants = 30% × after-tax incomeSavings and extra debt payments = 20% × after-tax income

Worked example

Inputs — After-tax income: $4,500 per month; Needs share: 50 %; Wants share: 30 %; Your actual monthly needs: $2,500; Your actual monthly wants: $1,100.
Results — Needs (monthly) = $2,250.00; Wants (monthly) = $1,350.00; Savings and debt repayment (monthly) = $900.00; What's left to save with your actual spending = $900.00; Your actual savings rate = 20 %; Yearly savings target = $10,800.00.

Frequently asked questions

What counts as needs?

Housing, utilities, groceries, insurance, transport to work and minimum debt payments.

What counts as wants?

Eating out, entertainment, travel, hobbies and upgrades.

Is the 50/30/20 rule based on gross or net income?

Net (after-tax) income.

What formula does the 50/30/20 Rule Calculator use?

Needs = 50% × after-tax income.

Cite this calculator

Speedy Calculator. (2026). 50/30/20 Rule Calculator. Speedy Calculator. https://speedycalculator.com/calculators/finance/budget-50-30-20/