Enter a goal, a deadline and an interest rate to get the monthly amount you need to save.
By TanLabs · Formulas cross-checked against the free spreadsheet · Updated 2026-10-31 · Runs in your browser – nothing you type is sent anywhere
With savings goal $10,000, already saved $1,000, months to goal 24, interest rate 4% per year:
Save $357 per month
Over 24 months you deposit $8,580; interest adds about $420
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Monthly saving P = (goal − current × (1+r)^n) × r ÷ ((1+r)^n − 1), with r = annual rate ÷ 12 (P = (goal − current) ÷ n if rate is 0).
Your savings account APY today. Use 0 for a cash envelope.
No – rates change. Treat the result as an estimate.
Run each separately and add the monthly amounts, or use sinking funds in a budget sheet.