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Savings APY returns

What will my savings balance be, and how much of it is interest?

Your inputs

Your inputs

$
Enter the amount already deposited at the start. Do not include future monthly contributions; enter those separately.
%
Enter 4.5 for 4.5% APY. APY already includes compounding. This scenario assumes the rate stays constant; a variable rate changes your actual return.
days
Enter the number of days the money remains deposited. The model uses a 365-day year and 12 equal-length months, not the bank’s actual calendar.
Advanced settings5 inputs
$
The contribution is added at the end of each modeled month and earns interest afterward, not from the start of that month. Enter 0 for no additional deposits.
$
Enter what you withdraw at each month-end. Interest is calculated first, followed by deposits, withdrawals and fees on that same modeled date.
$
Enter the fee you actually pay each month. Enter 0 only if the fee is waived or the account is free. Fees reduce the balance and subsequent interest.
$
Enter the balance you want at the end of the period. The tool estimates the monthly contribution required under the same APY, withdrawals and fees. Enter 0 to skip this calculation. Less than one full modeled month provides no month-end deposit opportunity.

Compare after-tax returns

Your result

Example · Estimate

Estimated pretax interest after account fees

$400.00

365 days · pretax estimate

Starting with $10,000.00 at 4% APY for 365 days, the estimated ending balance is $10,400.00 after month-end contributions, withdrawals and fees. Net interest of $400.00 means interest minus account fees, not the entire balance.

Pretax net interest

Key figures

Ending balance
$10,400.00
Total interest
$400.00
Total account fees
$0.00

Result analysis

Accumulated interest and account fees are shown separately. Net interest is their difference, not the entire balance.
Total interest$400.00
Total account fees$0.00
Show calculation details
Ending balance
$10,400.00
Total interest
$400.00
Total account fees
$0.00
Total contributions
$0.00
Total withdrawals
$0.00

Calculation basisFormula, assumptions & scope

Convert APY to growth for each period. Add deposits, withdrawals and fees at month-end. Apply remaining days after the last complete modeled month.

  • APY already includes compounding; do not apply another compounding frequency on top of it.
  • Uses a 365-day year and 12 equal-length months. Actual bank calendar interest may differ.

CFPB: APY definitions and tiered interest (bonuses are not APY)

Inputs used for this calculation
What would you like to calculate?
Estimate interest and balance
Initial deposit
10000 USD
Assumed APY
4 %
Days held
365 days
Monthly end-of-month deposit
0 USD
Monthly end-of-month withdrawal
0 USD
Monthly account fee
0 USD
Target ending balance (0 skips reverse calculation)
0 USD
Compare another APY?
Calculate this deposit only
Does APY change during this period?
Constant APY