Millionaire Date Calculator

Find out when you will hit your savings target at your current contribution rate.

Illustrative projections only. Not financial advice. Returns are not guaranteed.

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1% (safe)7% (stocks avg)15% (high risk)
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Frequently Asked Questions

Is a 7% return rate realistic?
7% is a commonly cited long-term average for diversified stock market index funds, adjusted for inflation. It is not guaranteed and past performance does not predict future results.
Does this account for inflation?
The basic calculation does not adjust for inflation. A million pounds or dollars in 30 years will have less purchasing power than today. Use the advanced mode to adjust.
Is this financial advice?
Absolutely not. This is an illustrative projection tool for curiosity and motivation only. Consult a qualified financial advisor before making any investment decisions.
What currency does this use?
The calculator is currency-neutral — enter figures in whatever currency you use and the results apply equally.
How does compound interest work?
Compound interest means you earn returns on your returns. Over long periods this creates exponential growth, which is why starting early makes such a large difference.

Compound Interest and the Millionaire Calculation

The millionaire date calculator is built on the compound interest formula: FV = P(1 + r/n)^(nt) + PMT × [(1 + r/n)^(nt) - 1] / (r/n). Where FV is future value, P is starting principal, r is annual interest rate, n is compounding frequency, t is time in years, and PMT is regular contribution. The result shows how quickly money grows when returns are reinvested — the core mechanic of long-term wealth accumulation.

The power of starting amount vs monthly contributions

Compound interest produces a counterintuitive result: starting amount has a disproportionate impact on final value because it benefits from more years of compounding. A £10,000 lump sum invested at 7% for 30 years grows to approximately £76,000 with no further contributions. Monthly £100 contributions over the same 30 years at 7% produce approximately £121,000. The lump sum is nearly three-quarters as valuable despite being a fraction of the total contributions — purely because of early compounding.

This is the mathematical basis for the financial planning maxim "time in market beats timing the market." Starting with a small amount early is worth significantly more than starting with a large amount late.

The 7% assumption

A 7% nominal annual return is commonly used in personal finance projections because it approximates the long-run historical average return of diversified global equity index funds after inflation adjustment. The actual historical figure for a 60/40 portfolio (60% global equities, 40% bonds) over rolling 30-year periods has ranged from roughly 4% to 10% depending on the start date. 7% is an optimistic but defensible centre estimate — not a guarantee.

Tax-advantaged accounts

In most countries, the most efficient path to investment growth uses tax-advantaged accounts — ISAs (UK), 401(k) and IRA (US), superannuation (Australia), RRSP and TFSA (Canada) — before investing in taxable accounts. Tax drag on investment returns compounds significantly over decades. A 7% return taxed annually at 20% produces approximately 5.6% net, which over 30 years is a substantial difference in outcomes.

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