How this calculator works
This uses an adapted version of the 50/30/20 budgeting rule, adjusted for families. The standard rule says 50% to needs, 30% to wants, 20% to savings. But families have higher fixed costs — childcare, bigger grocery bills, more insurance — so we flex the percentages.
The grocery estimate uses $150-200 per person per month, which lines up with USDA moderate-cost food plan data. Insurance and medical is estimated at 5-8% of take-home income, covering health, auto, and out-of-pocket costs. The savings target is 15-20% of income for retirement contributions, debt payoff, and emergency fund building.
Whatever's left after those recommended allocations is your true discretionary money — the stuff that makes life enjoyable but is also the first place to cut if the numbers are tight.
What this doesn't include
Taxes. This calculator starts from take-home pay, so federal and state taxes are already accounted for. But if you're self-employed or have variable withholding, your actual take-home may differ.
Irregular expenses. Car repairs, home maintenance, holiday gifts, back-to-school shopping — these don't show up monthly but they add up. A good rule of thumb is to set aside $100-200/month into a "sinking fund" for these.
Seasonal costs. Summer camp, heating bills, sports registration fees. These can swing your budget by $300-500 in certain months. The monthly view here shows your baseline — actual months will vary.
Next steps
Once you see the numbers, the next move is picking a tool to track them. Our comparison of the best budgeting apps breaks down which app fits which family situation — from zero-based budgeting to set-it-and-forget-it tracking.
If you want a dead-simple starting point, the One-Page Family Budget template gives you a printable sheet you can fill out in 10 minutes.
And if budgeting is one piece of a bigger financial puzzle, the Money Milestones Before 35 checklist helps you figure out what to prioritize first.
