Stop-Loss & Take-Profit Calculator
Turn a percent or R distance into exact stop-loss and take-profit prices for a long or short, with the reward-to-risk ratio and dollars at stake.
Enter your entry price, pick a side, and set how far away your stop and target sit as a percent. You get the exact stop and target prices, the reward-to-risk ratio, and — if you add a share count — the dollars at stake.填入入场价，选择方向，再以百分比设定止损与目标离入场价的距离，即可得到确切的止损价与目标价、盈亏比，若再填入股数，还能算出对应的金额。
Fill in the entry and both distances to see your stop and target.填入入场价与两个距离，即可看到止损价与目标价。
- Stop price止损价
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- Target price目标价
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- Reward : risk盈亏比
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- Dollar risk风险金额
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- Dollar reward回报金额
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A percent stop and target are just multipliers on your entry price: for a long, the stop sits below entry and the target above; for a short, the stop is above and the target below. The reward-to-risk ratio is the target distance divided by the stop distance — and it does not depend on the price or the share count at all.百分比的止损与目标，只是入场价上的乘数：做多时，止损在入场价下方、目标在上方；做空时则相反。盈亏比等于目标距离除以止损距离——它与价格和股数都无关。
01The formula公式
Short — Stop = Entry × (1 + Stop% ÷ 100), Target = Entry × (1 − Target% ÷ 100)做空 — 止损价 = 入场价 × (1 + 止损% ÷ 100)，目标价 = 入场价 × (1 − 目标% ÷ 100)
Reward : risk = Target% ÷ Stop%盈亏比 = 目标% ÷ 止损%
With shares Q: Dollar risk = |Entry − Stop| × Q, Dollar reward = |Target − Entry| × Q若有股数 Q：风险金额 = |入场价 − 止损价| × Q，回报金额 = |目标价 − 入场价| × Q
Notice the ratio ignores price entirely. A 5% stop against a 15% target is a reward-to-risk of 3-to-1 whether the stock trades at $8 or $800. Price and share count only set the dollars at stake, not the shape of the trade.注意盈亏比完全与价格无关。5% 的止损配上 15% 的目标，就是 3 比 1 的盈亏比，无论股价是 $8 还是 $800。价格和股数只决定所涉及的金额，而非交易的结构。
02A worked example一个算例
Suppose a trader goes long at $100.00, sets the stop 5% away and the target 15% away.假设一位交易者在 $100.00 做多，止损设在 5% 处，目标设在 15% 处。
- Stop = 100 × (1 − 0.05) = $95.00止损价 = 100 × (1 − 0.05) = $95.00
- Target = 100 × (1 + 0.15) = $115.00目标价 = 100 × (1 + 0.15) = $115.00
- Reward : risk = 15 ÷ 5 = 3.0 — three dollars of upside sought for every one at risk.盈亏比 = 15 ÷ 5 = 3.0——每承担 1 元风险，就寻求 3 元的上行空间。
- With 100 shares: risk = 5 × 100 = $500, reward = 15 × 100 = $1,500.若持有 100 股：风险 = 5 × 100 = $500，回报 = 15 × 100 = $1,500。
A short at the same entry simply flips the prices: the stop lands at $105.00 and the target at $85.00, with the identical 3-to-1 ratio. The percentages define the trade; the side just decides which way the prices point.在同一入场价做空只是把价格翻转：止损价变为 $105.00，目标价变为 $85.00，盈亏比仍是 3 比 1。百分比决定交易的结构，方向只决定价格朝哪边走。
03The common trap常见陷阱
It is tempting to chase a fat reward-to-risk by stretching the target far away — a 2% stop against a 20% target reads as a glorious 10-to-1. But a target the price rarely reaches is a number on paper, not a trade. Reward-to-risk only matters alongside how often the target is actually hit; a 10-to-1 ratio that fills once in twenty tries loses money. Set the target where the price can plausibly go, then read the ratio — not the other way around.为了追求漂亮的盈亏比，把目标拉得很远很诱人——2% 的止损配 20% 的目标，看起来是壮观的 10 比 1。但价格很少触及的目标，只是纸面上的数字，而非真实的交易。盈亏比只有结合目标实际被触及的频率才有意义；若 20 次才成 1 次，10 比 1 也是亏钱的。先把目标设在价格有望到达之处，再读盈亏比——而非反过来。
04Where this breaks它的局限
This math places two clean price levels from an entry. It says nothing about whether the trade is a good one. A few honest limits:这套算法能从入场价干净地放出两个价格水平，但它并不判断这笔交易本身好不好。几点诚实的局限：
- A stop is a request, not a guarantee. Overnight gaps and thin liquidity can fill you well past the stop price, so the real loss can exceed the dollar risk shown here.止损是一个请求，而非保证。隔夜跳空与流动性不足可能让你的成交价远超止损价，因此实际亏损可能超过这里显示的风险金额。
- Percent distances ignore volatility. A 5% stop is loose on a sleepy utility and tight on a small-cap that swings 8% in a day. Match the distance to how the specific name actually moves, not a habit.百分比距离忽略了波动性。5% 的止损对一只平稳的公用事业股是宽的，对一天波动 8% 的小盘股却是紧的。要让距离贴合该个股实际的波动幅度，而非套用习惯。
- The ratio is not the odds. Reward-to-risk describes the payoff shape, never the probability of reaching the target. A rich ratio with a low hit rate can still lose over many trades.盈亏比不是胜率。盈亏比描述的是回报的结构，从不代表触及目标的概率。高盈亏比若配上低胜率，在多笔交易后仍可能亏损。
The percentages set the reward-to-risk shape; the price and share count only scale the dollars. Neither one tells you how often the target is reached.百分比决定盈亏比的结构；价格与股数只放大金额。两者都无法告诉你目标被触及的频率。
Turn this ratio into a break-even win rate with the 用 risk-to-reward calculator盈亏比计算器, or turn a stop into a share count with the 把这个比率换算成保本胜率，或用 position size calculator仓位计算器.把止损换算成股数。