Investing & Wealth

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.

Daily Compound Interest Calculator Results

$0.00

Total Future Value

  • Total Contributed —
  • Interest Earned —

What This Means

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

  1. Enter Initial Balance
    Input starting cash deposit.
  2. Enter Annual Interest Rate (%)
    Input annual interest rate.
  3. Add Regular Monthly Deposit
    Input additional monthly savings.
  4. 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

On $100,000 at 5% over 10 years, daily compounding earns $64,872 in interest compared to $62,889 with annual compounding (an extra $1,983).

It compounds the initial principal daily using a daily rate of the annual rate divided by 365, and separately grows the monthly contributions as an annuity using the equivalent monthly growth factor. The final value is the sum of the two, and interest is that total minus everything you put in.

An initial principal or a monthly contribution — at least one must be above zero — plus the annual rate and the number of years. The years must be greater than zero, or the tool stops with 'Enter the number of years.'

It is the total you actually paid in: the initial principal plus each monthly contribution across all the months. Subtracting it from the final value isolates the interest earned.

Yes. Leave the monthly contribution at zero and the calculator compounds only the initial principal daily. Likewise you can start from zero principal and contribute monthly.

Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.

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