Korean stocks generally have a daily price limit of 30% above or below the base price. Start with $1,000 and assume the stock reaches the full 30% upper limit every trading day: the balance first passes $2,000 after three days, and it first passes $10,000 after nine.
How many 30% limit-up days reach each target?
This is a Korean-market calculation. Korea Exchange describes the usual daily price limit for stocks as ±30% of the base price. The table assumes an exact 30% gain on each trading day and no deposits, withdrawals, taxes, fees, or rounding from price ticks.
| Target multiple | Target from $1,000 | First trading day above the target | Amount on that day |
|---|---|---|---|
| 2x | $2,000 | Day 3 | $2,197.00 |
| 3x | $3,000 | Day 5 | $3,712.93 |
| 5x | $5,000 | Day 7 | $6,274.85 |
| 10x | $10,000 | Day 9 | $10,604.50 |
| 100x | $100,000 | Day 18 | $112,455.41 |
Two 30% gains leave $1,000 at $1,690, so the money has not doubled yet. The third gain produces $2,197. The same threshold effect appears at 10x: after eight days the balance is about $8,157; after the ninth it passes $10,000.
Why repeated limit-up days compound
The calculation is not $1,000 plus 30% of $1,000 for each day. Each day's gain becomes part of the next day's starting amount.
| Consecutive limit-up days | Calculation | Balance from $1,000 |
|---|---|---|
| 1 day | $1,000 × 1.3 | $1,300 |
| 2 days | $1,000 × 1.3² | $1,690 |
| 3 days | $1,000 × 1.3³ | $2,197 |
| 9 days | $1,000 × 1.3⁹ | About $10,604 |
The target-day question is therefore different from asking what happens after a fixed five days. It asks when the growing balance first clears a stated amount.
U.S. stocks do not have a daily 30% price limit
U.S. stocks do not have one universal daily +30% upper limit comparable to the Korean stock-market price limit. The U.S. Limit Up-Limit Down mechanism uses price bands designed to keep trades from occurring outside specified ranges and can lead to a trading pause. Its bands are not a fixed daily 30% closing cap for all stocks.
Applying a 30% daily gain to a U.S. stock can illustrate a hypothetical return path, but it would not describe a U.S. exchange price-limit rule.
What the calculation leaves out
The assumption that an investor can buy, hold, and later sell the desired number of shares at each upper limit is a major simplification. Upper-limit order queues, liquidity, halts, disclosures, fees, taxes, corporate actions, and price-tick rounding all matter. Trading days also exclude weekends and exchange holidays.
This is not a forecast of a stock reaching its upper limit or a recommendation to trade one. It only calculates the money path when a fixed 30% daily return is repeated under a Korean-market price-limit assumption.