Daily Compound Interest Calculator
Calculate investment and savings growth with daily interest compounding (365 times/year) and recurring monthly deposits.
What this calculator does
The Daily Compound Interest Calculator estimates your result instantly from the values you enter, using standard investing & wealth formulas. Calculate investment and savings growth with daily interest compounding (365 times/year) and recurring monthly deposits. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate for planning rather than financial advice.
About Daily Compound Interest Calculator
The Daily Compound Interest Calculator models high-yield savings accounts, money market funds, and dividend reinvestment plans where interest compounds daily (n = 365).
Formula & Mathematical Calculation
A = P × ( 1 + r / 365 )^(365 × t) + PMT × [ (( 1 + r / 365 )^(365 × t) - 1) / (r / 365) ]
Calculation Example
$25,000 @ 5.0% APY Compounded Daily for 5 Years (+$200/mo deposit): Total Future Value = $45,862.14 (Interest Earned = $8,862.14).
Key Benefits
- Models daily compounding interest (n = 365)
- Supports initial principal plus recurring monthly or weekly deposits
- Itemizes total principal contributed vs. total daily interest earned
- Matches high-yield savings account bank calculations
- Fast and private calculation
How to Use this Calculator
-
Enter Initial Balance
Input starting cash deposit. -
Enter Annual Interest Rate (%)
Input annual interest rate. -
Add Regular Monthly Deposit
Input additional monthly savings. -
Calculate Daily Growth
Click Calculate to view daily compounding balance.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Rates and contributions are assumed to stay constant for the whole period unless the form asks for them separately.
- Results use standard financial formulas and ignore fees, penalties and promotional terms that are not entered above.
- Inflation, tax changes and market volatility are not modelled unless a field for them is provided.
- Amounts are unit-agnostic: results are returned in the same currency you enter.
What it does not cover
- Daily Compound Interest Calculator produces estimates for education and planning, not a quote, offer or professional advice.
- Real-world outcomes differ when fees, taxes, rounding rules or provider-specific terms apply.
- Local regulations and tax rules vary by country and change over time; verify current rules for your jurisdiction.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For decisions with lasting financial impact, confirm the numbers with a qualified professional.
Frequently Asked Questions
You May Also Need
Next step: browse the full Investing & Wealth calculators or read the related guides for context before you decide.