Budget Calculator
Needs, wants, and savings split with verdict against the 50-30-20 rule.
What it does
The 50-30-20 rule gives every dollar a job before the month starts: half for needs, thirty percent for wants, twenty for savings and debt payoff. It fits on one line yet catches the two classic leaks, lifestyle creep and zero saving.
The tool above takes monthly take-home with the three buckets. It returns each share against its target with a plain verdict beside them.
The default of $5,000 with $2,800 needs, $1,500 wants, and $700 savings reads 56, 30, and 14%: needs $300 over with savings $300 short. A clean $4,000 split of $2,000, $1,200, and $800 lands exactly 50, 30, 20.
The rule follows federal financial education budgeting guides with matching classroom worksheets. Both call it one rule to live by, not law, and note expensive cities bend it.
How to use
- Enter monthly take-home pay after taxes.
- Total needs: housing, food, transport, insurance.
- Total wants: dining, fun, travel, upgrades.
- Total savings plus extra debt payments.
- Read each share against its target, then fix the worst.
Formula
- needs
- Must pays: housing, groceries, utilities, transport.
- wants
- Choose to haves: dining, entertainment, travel.
- 20%
- Savings plus extra debt payoff floor.
Take-home (net) income throughout, never gross. Unassigned leftover reads as a nudge to savings; overspending past income reads as the overage to trim.
Worked example
Example: $5,000 with $2,800 needs
Defaults: income 5000, needs 2800, wants 1500, savings 700.
- Needs: 2,800 / 5,000 = 56 % against 50%.
- Wants: 1,500 / 5,000 = 30 % on target.
- Savings: 700 / 5,000 = 14 % against 20%.
- Gaps: needs $300 over, savings $300 short, zero unassigned.
- Tool shows the three shares with verdict Exactly on plan (every dollar assigned).
Reference table
| Income / needs / wants / save | Split | Verdict |
|---|---|---|
| 5000 / 2800 / 1500 / 700 | 56 / 30 / 14 | Needs over, savings short |
| 4000 / 2000 / 1200 / 800 | 50 / 30 / 20 | Exactly on plan |
| 3000 / 2000 / 800 / 200 | 67 / 27 / 7 | Needs over, savings short |
Limits
- One rule among many; expensive cities bend it honestly.
- Needs versus wants is personal: childcare counts as need.
- Irregular income needs averaging first.
- Debt minimums inside savings flatter the savings line.
Common mistakes
- Budgeting gross instead of take-home pay.
- Hiding wants inside needs categories.
- Saving whatever is left instead of first.
- Recasting the rule monthly instead of holding it.
- Ignoring small subscriptions that total hundreds.
Try it yourself
Quick checks. Answers sit tucked under each question.
$4,000 split 2000/1200/800?
50 %, 30 %, 20 %: exactly on plan.
$3,000 with needs $2,000?
67 % needs: $500 over the 50% line.
Leftover $200 unassigned?
Send it to savings: the verdict says so.
Questions
What is the 50-30-20 rule?
Half of take-home to needs, 30% to wants, 20% to savings and debt payoff.
Needs or wants: childcare?
Needs. Anything required to live, work, and protect counts there.
What if housing alone is 50%?
Bend honestly: cut wants hard, raise income, or move when the lease allows.
Where do debt payments go?
Minimums ride in needs; extra payoff counts as savings.
How do I start?
Track one real month, split it, then fix the worst bucket first.
Save first or last?
First: automate the 20% on payday before wants compete.
Sources
- CFPB: Learning about budgets (50-30-20 guide, PDF)
- CFPB: Analyzing budgets (50-30-20 worksheet, PDF)