What's the difference between nominal and real growth?

Nominal growth is your account balance in future dollars; real growth divides that by inflation to show what it's worth in today's purchasing power. Turn on inflation adjustment to see both side by side.

How does compounding frequency change the result?

More frequent compounding (daily vs annual) earns slightly more because interest is calculated and added to the balance more often, so it starts earning its own interest sooner. Continuous compounding is the mathematical limit of this effect.

What does Goal mode solve for?

Pick a target amount and choose whether the calculator should solve for the monthly contribution needed, the annual rate needed, or the number of years needed, holding the other inputs fixed.

Is tax applied to the whole balance or just the growth?

Only to interest/gains earned, not your original contributions — you can choose to tax it every year or defer it to a single deduction when you withdraw.

What is CAGR and why does it differ from my annual rate input?

CAGR (compound annual growth rate) is the smoothed annual return implied by the start and end balances including contributions, fees and taxes — it can differ from the nominal rate you entered once all of those are factored in.

ToolMano

Compound interest calculator

Savings and investment growth with contributions, taxes and inflation.

No uploadNo signupWorks offline

Starting principal

Annual interest rate %

Duration (years)

Final balance

$144,572.72

Total interest earned

$86,572.72

Total contributed

$48,000.00

CAGR

14.29%

Total fees

$0.00

Total tax

$0.00

A = P(1 + r/n)^(nt) for periodic compounding, or A = Pe^(rt) for continuous compounding, plus contributions each period.

Quick presets

Effective annual rate

7.23%

Doubling time

9.9 yrs

Total withdrawals

$0.00

Year-by-year growth

Year	Contributions	Interest	Fees/Tax	Withdrawals	Balance	Real balance
1	$2,400.00	$801.42	$0.00	$0.00	$13,201.42	$13,201.42
2	$2,400.00	$1,032.85	$0.00	$0.00	$16,634.27	$16,634.27
3	$2,400.00	$1,281.01	$0.00	$0.00	$20,315.28	$20,315.28
4	$2,400.00	$1,547.11	$0.00	$0.00	$24,262.39	$24,262.39
5	$2,400.00	$1,832.45	$0.00	$0.00	$28,494.83	$28,494.83
6	$2,400.00	$2,138.41	$0.00	$0.00	$33,033.24	$33,033.24
7	$2,400.00	$2,466.49	$0.00	$0.00	$37,899.74	$37,899.74
8	$2,400.00	$2,818.29	$0.00	$0.00	$43,118.03	$43,118.03
9	$2,400.00	$3,195.52	$0.00	$0.00	$48,713.55	$48,713.55
10	$2,400.00	$3,600.02	$0.00	$0.00	$54,713.58	$54,713.58
11	$2,400.00	$4,033.77	$0.00	$0.00	$61,147.34	$61,147.34
12	$2,400.00	$4,498.86	$0.00	$0.00	$68,046.20	$68,046.20
13	$2,400.00	$4,997.58	$0.00	$0.00	$75,443.79	$75,443.79
14	$2,400.00	$5,532.35	$0.00	$0.00	$83,376.14	$83,376.14
15	$2,400.00	$6,105.79	$0.00	$0.00	$91,881.93	$91,881.93
16	$2,400.00	$6,720.67	$0.00	$0.00	$101,002.60	$101,002.60
17	$2,400.00	$7,380.00	$0.00	$0.00	$110,782.60	$110,782.60
18	$2,400.00	$8,087.00	$0.00	$0.00	$121,269.60	$121,269.60
19	$2,400.00	$8,845.11	$0.00	$0.00	$132,514.70	$132,514.70
20	$2,400.00	$9,658.02	$0.00	$0.00	$144,572.72	$144,572.72

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About compound interest calculator

Compound interest calculator projects how a lump sum plus regular contributions grow over time at a given annual rate, compounded daily, monthly, quarterly, half-yearly, annually or continuously — the same maths behind savings accounts, index funds and retirement plans.

Go beyond a bare compound-interest formula with annual contribution increases (e.g. raising your monthly deposit with inflation), fees (an annual expense ratio and a fixed fee), tax on interest or gains, scheduled withdrawals, and an inflation adjustment to see real versus nominal growth.

A goal-seeking mode flips the question around: tell it the target amount and it solves for the contribution, the rate, or the number of years needed to get there, alongside a year-by-year table, CAGR and doubling time.

How to use Compound interest calculator

1Enter your starting principal, annual rate and how long you're investing for.
2Add a regular contribution amount, frequency and whether it's added at the start or end of each period.
3Turn on fees, taxes, inflation or withdrawals in Advanced mode if they apply.
4Read the year-by-year growth table, or switch on Goal mode to solve for the contribution, rate or time needed.

What it does

Daily, monthly, quarterly, half-yearly, annual or continuous compounding
Regular contributions with annual step-up and start/end-of-period timing
Inflation adjustment showing real vs nominal value
Tax on interest, annually or only at withdrawal
Annual expense-ratio fee and fixed fee modelling
Scheduled withdrawals
Goal-seek mode: solve for contribution, rate, or years to reach a target
Year-by-year growth table with CAGR, effective annual rate and doubling time
Currency and locale-aware formatting
CSV export of the year-by-year table

Frequently asked questions

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