Daily Compounding
Daily Compound Interest Calculator
Daily compounding means your interest is calculated and added to your balance 365 times per year. This is the standard for high-yield savings accounts, money market funds, and many CDs. It produces slightly higher returns than monthly or annual compounding.
How Daily Compound Interest Works
With daily compounding, the formula becomes A = P(1 + r/365)^(365×t). Each day, 1/365th of your annual rate is applied to your current balance (including all previously earned interest). Over time, this produces more growth than less frequent compounding.
Daily vs Monthly vs Annual: What's the difference?
For $10,000 at 5% for 10 years:
- Daily: $16,486.65 (APY: 5.127%)
- Monthly: $16,470.09 (APY: 5.116%)
- Annual: $16,288.95 (APY: 5.000%)
The difference between daily and monthly is $16.56 over 10 years on $10,000 — small but meaningful at higher balances and longer timeframes.
Who uses daily compounding?
- High-yield savings accounts (Ally, Marcus, Discover)
- Money market accounts
- Many certificates of deposit (CDs)
- Some brokerage sweep accounts
Popular daily compounding scenarios
Frequently Asked Questions
How is daily compound interest calculated?
Daily compounding uses the formula A = P(1 + r/365)^(365 × t), where P is the principal, r is the annual rate as a decimal, and t is the number of years. Each day, 1/365th of the annual rate is applied to your current balance, including all previously earned interest.
Is daily compounding better than monthly compounding?
Yes, but only slightly. Daily compounding applies interest 365 times a year versus 12 for monthly, so it earns a little more. For $10,000 at 5% over 10 years, daily compounding yields $16,486.65 versus $16,470.09 monthly — a difference of about $16.56.
Do banks actually compound interest daily?
Many high-yield savings accounts and money market accounts compound daily, though they typically credit the interest to your account monthly. Many CDs and some brokerage sweep accounts also use daily compounding.
What is the APY for a 5% rate compounded daily?
A 5% nominal rate compounded daily produces an APY (effective annual rate) of about 5.127%. The APY is always higher than the nominal rate when compounding happens more often than once per year.