🐷 Savings Calculator
See how a starting balance plus regular monthly deposits can grow over time with compound interest.
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How this calculator works
This savings calculator projects your account balance by combining a starting deposit with regular monthly contributions, then applying compound interest month by month over your chosen time period.
The formula
It uses the standard future-value formula for a lump sum plus a monthly annuity: your starting balance grows at the monthly interest rate compounded over every month, and each monthly deposit also earns interest for the months remaining after it’s added.
This tool is for general planning and education. Actual savings account rates, fees, and compounding schedules vary by institution, and returns are not guaranteed.
Last reviewed August 2026