High-Yield Savings Interest Calculator
Last updated: November 5, 2026
Project a high-yield savings balance with monthly deposits, APY and account fees.
Projected ending balance
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- Total contributions: —
- Estimated interest earned: —
- Total account fees: —
On this page
Quick summary: Project a high-yield savings balance with monthly deposits, APY and account fees.
Read the method, example and limitations
Updated reference sections in this guide are in English.
Guide language: English. Updated October 15, 2026.
What this calculator estimates
Project a high-yield savings balance with monthly deposits, APY and account fees.
Inputs and units
Enter Starting balance ($), Monthly deposit ($), Annual percentage yield (%), Saving period (months), Monthly account fee ($). Use the units shown. Required fields cannot be blank. Use zero only where that field and the model allow it. Select Calculate after changing the values.
Method and assumptions
Convert entered APY to monthly rate (1+APY/100)^(1/12)-1. Each month earns interest on the opening balance, receives the deposit and pays the fee up to available funds. The balance cannot become negative. Sum actual interest and fees paid.
Worked example
Starting with 100, no deposits, 0% APY and a 30 monthly fee for twelve months ends at zero. Only 100 in fees can be paid from that balance, and interest earned remains zero.
Limitations
Real bank fee policies can include waivers or overdrafts; this model does not. Deposits are assumed at month end. Months must be whole values from 0 to 1,200. APY remains constant and taxes are excluded.
APY already contains annual compounding
The account projection derives a monthly rate from the entered effective APY. Do not divide APY by 12 as though it were a nominal annual rate. Match deposit timing and monthly fees to the period being compared; a fee can consume the interest on a small balance. This is a fixed-APY scenario: a real savings rate can change and the form does not fetch an account’s current terms.