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Savings Growth Calculator: Project Deposits and Compound Interest

Projection: Project a savings balance using the entered APY, starting balance and monthly deposits. The result shows contributions separately from estimated interest.

Project balance growth with APY, deposits and compounding.

Set the contribution habit before judging the APY

Deposits usually do more early work than interest. This view keeps them separate so a high rate does not receive credit for money you added.

Projected balance

Your plan will appear here

See deposits, estimated interest and yearly checkpoints.

APY already reflects compounding

The calculator converts APY to an equivalent monthly growth rate, compounds the starting balance and treats each monthly deposit as an end-of-month contribution.

A $10,000 starting balance and regular $250 deposits grow from both new contributions and compound interest. Comparing those two result lines prevents APY from receiving credit for money you deposited yourself.

Turn the projection into a useful plan

  • Enter the balance already saved.
  • Add a realistic monthly deposit.
  • Use the account's current APY, not its simple interest rate.
  • Run a lower-APY case because savings rates can change.

The model has boundaries

The projection assumes a constant APY and monthly deposit. It excludes fees, withdrawals, taxes and balance-tier changes.

Improve the inputs: learn how APY includes compounding and check whether fees cancel the higher APY.

Check the calculator against the disclosure

A useful estimate still depends on accurate inputs. These official resources explain the terms behind this tool.

Before you rely on the number

Does this calculator predict a future APY?

No. It applies the APY you enter for the full period so you can compare scenarios.

When are monthly deposits added?

The estimate treats deposits as arriving at the end of each month. Depositing earlier can produce slightly more interest.

This calculator is educational. It is not a quote, approval decision or individualized financial advice.