After-School Activity Cost Calculator accuracy and testing

Formula source

• Total activity cost = registration fee + monthly fee x months + gear cost + travel cost + event cost + other costs.

Test cases

Known limitations

• These calculators do not fetch local prices, predict provider changes, model taxes or eligibility rules, or replace professional advice. The result is only as reliable as the assumptions entered.

Assumptions

• All costs, rates, schedules, subsidies, returns, and inflation assumptions are user-entered.
• Calculations are deterministic and run locally in the browser; Calwarden does not upload or store family budget inputs.
• Results are household planning estimates, not professional financial, childcare, education, tax, or legal advice.

Unit handling

• Registration Fee accepts values in $.
• Monthly Fee accepts values in $/mo.
• Activity Months accepts values in months.
• Gear or Supplies accepts values in $.
• Travel Cost accepts values in $.
• Events or Competitions accepts values in $.
• Other Costs accepts values in $.
• Estimated Total Activity Cost is displayed as currency.
• Recurring Fee Total is displayed as currency.
• Average Monthly Cost is displayed as currency.
• One-Time and Extra Costs is displayed as currency.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Input precision follows configured step values where provided.

Version history

Change log