Enter your savings target, current balance, monthly contribution, and expected interest rate to see exactly how long it will take to reach your goal — and how much interest you will earn along the way.
Use related tools to turn one estimate into a complete financial decision.
Enter your savings target and current balance to see how many months you need at your current contribution rate. The calculator uses monthly compound interest, which means interest earned each month is added to your balance and earns interest the following month.
If rate = 0: months = (goal − current) ÷ monthly contribution
If rate > 0: months = log((goal + PMT/r) ÷ (current + PMT/r)) ÷ log(1 + r)
Where r = annual rate ÷ 12 and PMT = monthly contribution. Accounts for compound growth of both contributions and existing savings.
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Related reading: Can I afford to go freelance? The financial checklist
This calculator is an educational estimate based on standard time-value-of-money formulas. It assumes a fixed interest rate compounded monthly and consistent monthly contributions. Real-world savings may vary due to rate changes, irregular deposits, or fees.
Finance Tools Hub calculators are maintained by Renato Bryant, whose background includes management, budgeting, compliance, and operational oversight. The goal is to make financial calculator logic more transparent and more useful for real decision-making.
Last updated: April 2026.