Frequently asked questions
What interest rate should I assume for a savings account?
High-yield savings accounts currently offer 4–5% APY. Standard bank accounts offer under 1%. If you plan to invest in a diversified portfolio, historical averages are 7–10% for stocks, 4–6% for bonds. Use a conservative figure for planning: overestimating returns can leave you short.
Does the order of contributions matter?
Yes. This calculator assumes contributions at the start of each month, so each deposit gets a full month of interest. If you contribute at the end of the month instead, your result will be slightly lower. The difference is small for typical savings rates.
How does this differ from a compound interest calculator?
This is focused specifically on the savings use case: a starting deposit plus regular monthly additions. A compound interest calculator may offer more options like variable contribution frequencies, step-ups, and one-time deposits. Use this for a straightforward monthly savings projection.
Should I increase my monthly contribution over time?
Increasing contributions annually (even by 3–5%) has a dramatic compounding effect. A 5% annual step-up over 20 years can add 30–50% to your final balance. If your income grows, directing the increase toward savings is one of the highest-leverage moves you can make.
Is this result guaranteed?
No. The calculator assumes a fixed, constant rate of return throughout the period. Real returns vary year to year, especially for investment portfolios. Savings accounts have more predictable but variable rates. Use this as a planning estimate, not a guarantee.
Does this account for taxes or inflation?
No. The result shows nominal, pre-tax growth. Interest income is typically taxable, and inflation erodes purchasing power over time. For a more realistic picture of future buying power, subtract 2–3% from your expected rate to approximate a real (after-inflation) return.