Daily Compounding Calculator

Daily Compound Interest Calculator

Estimate future value where interest is compounded every day, with optional deposits, inflation, tax, fees and downloadable tables.

Inputs

Your calculation

Currency

Starting amount

Interest rate

Rate convention

AER/APY already includes compounding. The selected compounding frequency applies only to a nominal rate.

Years

Months

Compounding frequency

Regular contributions

Deposit amount

Frequency

Withdrawal amount

Frequency

Timing

Annual increase

Adjust for inflation

Inflation rate

% annually

Include tax / fees

Tax on interest

Annual fee

Calculation assumptions

Calculations use monthly steps. Weekly payments are averaged as 52/12 payments per month; they are not scheduled by calendar date. Annual payments occur at the beginning or end of each year. Daily compounding uses a fixed 365-day convention. Annual payment increases apply every 12 months to both deposits and withdrawals. Tax applies monthly to positive interest; fees are deducted monthly from the balance and capped at available funds. Withdrawals cannot overdraw the account. Simple interest accrues on contributed capital remaining in the account; withdrawals and fees reduce that capital proportionally. Inflation changes purchasing power, not the nominal balance. Full method.

Outputs

Results

Enter your numbers and click calculate.

Final balance

£0.00

Total contributions

£0.00

Withdrawals: £0.00

Gross interest

£0.00

Tax/fees: £0.00

Year-by-year table

A yearly summary of balance, contributions and interest.

Year	Deposits	Withdrawals	Interest	Tax / fees	End balance

What if I allow five more years?

Calculate to see the comparison.

Simple vs compound interest

Calculate to see the comparison.

Excel formula

A matching FV formula is available for constant monthly payments without tax, fees or account exhaustion. Annual and increasing payments require the exported schedule. Inflation adjustment is separate.

=FV(...)

Growth chart

Compare your balance, net cash paid in and net growth or loss after deductions. Negative returns remain visible.

Yearly chart

Month-by-month table

Click a year to expand the monthly breakdown.

Guide

Daily compounding: rate and day-count assumptions

At a 5% nominal annual rate, £10,000 compounded daily for ten years becomes approximately £16,486.65, compared with £16,470.09 using monthly compounding. The daily model uses 365 days per year, with monthly-equivalent growth between cash flows. It does not calculate individual dated bank transactions or leap-day interest.

If your account quotes 5% AER, choose Effective annual rate instead: compounding is already included in AER. Compare compounding frequencies.

How this calculator works

Daily compounding means interest is calculated and added using 365 compounding periods per year. The difference versus monthly compounding is often small for normal savings rates, but it can matter over long periods or at higher rates.

You can still change every input: currency, interest rate, years and months, compounding frequency, contribution timing, inflation and tax or fees. Use the share URL button to save a pre-filled version of the result.

FAQ