Compound growth is usually written as future = present × (1+r)n. This tool flips it: n = ln(1T ÷ present) ÷ ln(1+r). Give it any starting wealth and any rate, and it tells you the years. The compound growth calculator does the reverse — it solves for the future value given the years.
$1 billion at 20%: about 38 years to $1 trillion. That's roughly the career span of a founder who starts at 30 and compounds relentlessly.
$1 billion at 10%: about 73 years — longer than most investing careers.
$1 billion at 7%: about 104 years. At average market returns, a billion doesn't become a trillion in a human lifetime.
$100 million at 30%: about 33 years. Higher rates collapse the timeline — which is why the only historical path to trillion-scale wealth runs through extraordinary, sustained company growth, not savings.
Time-to-trillion is logarithmic in the starting amount but inversely logarithmic in the rate — meaning doubling your starting wealth shaves off a few years, while adding a few points of sustained growth shaves off decades. This is why every trillion-dollar story is a growth story first: Nvidia's ascent wasn't about starting big, it was about compounding at extraordinary rates while AI demand exploded.
From $1 billion: ~38 years at 20%, ~73 years at 10%, ~104 years at 7% annual growth. From smaller amounts, proportionally longer.
Any positive rate, given enough time — it's a 1,000× gain. At 30% it takes ~26 years. Sustaining 30% for 26 years is extraordinarily rare.
This tool solves for time given wealth and rate. The compound growth calculator solves for future value given wealth, rate, contributions, and years.
A trillion is 1012. Compounding multiplies by (1 + rate) each year. To bridge twelve orders of magnitude at 10% a year takes log(1012) / log(1.1) ≈ 290 years — and that's with the entire starting fortune compounding, no withdrawals, no taxes, no bad years. With annual contributions of $50,000, the wait barely shortens: contributions are rounding error against twelve zeros.
The honest takeaway: nobody has ever compounded their way to a trillion from savings. Every fortune approaching that scale came from concentrated ownership — founding equity, early stakes — that the market repriced by orders of magnitude. Compounding is the engine of ordinary wealth; repricing is the engine of extreme wealth. Our trillionaire race guide walks through the actual mechanisms.
At 10% a year, about 290 years. At 15% (exceptional, sustained), about 190 years. Compounding alone cannot bridge the gap in a lifetime from ordinary starting wealth.
Not by compounding savings — the math above shows why. Historical near-trillionaires got there via concentrated equity ownership (founding or early stakes in companies the market repriced enormously), not diversified investing. This tool is educational, not financial advice.
About 41% per year, sustained for two decades — a return no diversified portfolio has ever delivered. Concentrated bets occasionally do; they also frequently go to zero.
No — figures are nominal. In real (inflation-adjusted) terms, everything takes longer. Enter a lower rate to approximate real returns.