Compound scenario · Verified 2026-05-27
How long does it take $10,000 to double at 7%?
Grows to $21,549 over 11 years. You contribute $10,000; the remaining $11,549 (54%) comes from compound growth.
Final balance
$21,549
You contributed
$10,000
From compounding
$11,549
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Year-by-year breakdown
| Year | Total contributed | Interest earned | Balance |
|---|---|---|---|
| 1 | $10,000 | $723 | $10,723 |
| 2 | $10,000 | $1,498 | $11,498 |
| 3 | $10,000 | $2,329 | $12,329 |
| 4 | $10,000 | $3,221 | $13,221 |
| 5 | $10,000 | $4,176 | $14,176 |
| 6 | $10,000 | $5,201 | $15,201 |
| 7 | $10,000 | $6,300 | $16,300 |
| 8 | $10,000 | $7,478 | $17,478 |
| 9 | $10,000 | $8,742 | $18,742 |
| 10 | $10,000 | $10,097 | $20,097 |
| 11 | $10,000 | $11,549 | $21,549 |
How this number was calculated
Standard compound interest formula with monthly compounding (n = 12):
Balance = P × (1 + r/n)^(n × t) + PMT × [((1 + r/n)^(n × t) − 1) / (r/n)] where: P = $10,000 (initial amount) PMT = $0 (monthly contribution) r = 0.0700 (annual rate as decimal) n = 12 (compounding periods per year) t = 11 (years) Final balance = $21,549
Same closed-form math used by Investor.gov (SEC) and 7 other major calculators we tested — all produce identical results to the cent.
Related scenarios
How long for $10,000 to double at S&P 500 average 10%?
→ $22,182 (8 years at 10%)
How long for $100,000 to double at 8%?
→ $221,964 (10 years at 8%)
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Open the calculator →Educational tool. Past performance does not predict future returns. Verified 2026-05-27. Math validated against Robert Shiller's S&P 500 historical dataset.