Grocery Budget Calculator
Calculate weekly and monthly grocery budgets by household size and diet type.
Benchmarked against USDA Thrifty, Low-Cost, and Liberal food plan spending tiers.
Weekly grocery budget by household size depends on the number of people in the household, their ages (children vs. adults have different caloric needs), dietary preferences, and local cost of living. The USDA publishes monthly official food cost plans that provide evidence-based benchmarks by household type and income level.
Weekly grocery budget formula: Weekly Budget = Σ (Individual Food Cost per Person per Week)
Per-person cost scales non-linearly because larger households benefit from:
- Buying in bulk (lower per-unit costs)
- Reduced packaging overhead
- Shared staple ingredients
Household size economies of scale factor:
- 1 person: add 20% to per-person benchmark (no bulk buying advantage)
- 2 people: use 1.0× per-person benchmark
- 3–4 people: subtract 5% per person from benchmark
- 5+ people: subtract 10% per person from benchmark
USDA Thrifty Plan weekly food cost benchmarks (2024):
- Male 19–50: $47.70/week
- Female 19–50: $43.10/week
- Child 2–3 years: $29.90/week
- Child 6–8 years: $37.50/week
- Child 9–11 years: $41.20/week
- Teen male 14–18: $54.50/week
- Teen female 14–18: $44.80/week
USDA Moderate-Cost Plan (more typical middle-class spending):
- Male 19–50: $72.50/week
- Female 19–50: $63.40/week
Worked example: Family of 4: Dad (38), Mom (35), daughter (10), son (7).
Thrifty plan totals:
- Dad: $47.70 + Daughter: $41.20 + Son: $37.50 + Mom: $43.10 = $169.50/week base
- Scale factor for 4 people: subtract 5% → $169.50 × 0.95 = $161.03/week
- Monthly grocery budget: $161.03 × 4.33 = $697/month
At the moderate-cost level: roughly $1,000–$1,100/month for this family, depending on location. Urban areas with high cost of living (NYC, San Francisco) add 20–40% to these figures.