Estimate months to reach a target with starting balance, monthly deposits, and APY. Fully client-side — no account, uploads, or remote storage.
Added Apr 18, 2026 · Updated May 1, 2026
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Enter a value for savings goal to see your result.
Calculates how many months it will take to reach a savings goal given your current balance, monthly contribution, and annual interest rate. Uses the future value annuity formula solved for the number of periods.
n = log((Goal·r + PMT) / (PV·r + PMT)) / log(1 + r)
Starting with $2,000 and contributing $400/month at 4% interest, you'd reach $10,000 in about 20 months.
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Use the annual percentage yield (APY) from your savings account. High-yield savings accounts in 2024 often offer 4–5% APY. A standard savings account may offer 0.01–0.5%.
No. Interest earned in a regular savings account is taxable income. For a more accurate projection, reduce the interest rate by your marginal tax rate (e.g. 4% × (1 − 0.22) ≈ 3.1% after-tax).
The math assumes steady monthly deposits. Lumpy contributions change the path slightly because less principal earns interest early. Re-run with your actual average contribution when planning.
Yes for retirement accounts if match vests predictably — it is part of your savings rate. For pure emergency-fund goals, exclude match since it may be locked in a 401(k).