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Budget Calculator — Annual Hobby Spending Planner

Plan your annual hobby budget across kits, paints, tools and events to keep spending on track.

How We Calculate This

Removes any savings set-aside first, splits the remaining (spendable) monthly budget across categories using your percentages, then projects the annual totals — optionally uplifted for inflation.

Formula

  • Spendable monthly = Monthly budget × (1 − Savings% ÷ 100)
  • Category monthly = Spendable monthly × (Category% ÷ 100)
  • Category annual = Category monthly × 12 × (1 + Inflation% ÷ 100)
  • Annual budget = Spendable monthly × 12 × (1 + Inflation% ÷ 100)

With the defaults (0% savings, 0% inflation) the spendable budget equals your monthly budget, the inflation factor is 1, and the five category annual lines sum exactly to the headline Annual budget.

Frequently Asked Questions

Last updated: February 2026

All calculations are estimates. Always verify quantities before purchasing materials.