Position Math

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Stop-Loss & Take-Profit Calculator

Convert your stop-loss and take-profit percentages into actual price levels for long or short trades, with the dollar risk and reward at each.

The setup

long: stop = entry·(1 − s%) · target = entry·(1 + t%)

Your levels

Stop-loss price—
Take-profit price—
Risk per unit—
Reward per unit—
Reward : Risk—
Type your numbers to see the levels.

How it works

What this calculator does

It converts the stop-loss and take-profit percentages you have in mind into actual price levels, for both long and short trades. Add a position size and it also reports the dollar amount you stand to lose or make at each level.

The formulas

For a long position:

stop price = entry × (1 − stop%)

take-profit price = entry × (1 + tp%)

For a short the signs flip: the stop sits above entry and the target below.

Worked example

You go long at $200 with a 5% stop and a 10% target. The stop is 200 × (1 − 0.05) = $190 and the target is 200 × (1 + 0.10) = $220. Holding 50 shares, the risk is (200 − 190) × 50 = $500 and the reward is (220 − 200) × 50 = $1,000 — a 2:1 trade.

What it deliberately does not do

It places levels at the prices you specify; it does not guarantee your order fills there in a gap or fast market. If you trade in lots or contracts, multiply by the contract size to get the true dollar figures. It ignores fees and funding unless you account for them separately. Use it to plan exits, not as investment advice.

Frequently asked questions

How do I calculate a stop-loss price from a percentage?
For a long trade, multiply entry by (1 − stop%): a 5% stop on a $200 entry is 200 × 0.95 = $190. For a short you add the percentage instead, so the stop sits above entry.
How do I set a take-profit level?
Multiply entry by (1 + target%) for a long, or (1 − target%) for a short. This tool does both directions and also shows the resulting risk-reward ratio.
How is a stop-loss different for long vs short trades?
On a long the stop is below entry and the target above. On a short you profit when price falls, so the stop is above entry and the target below. The tool handles both.
How much money will I lose at my stop?
Enter a position size and the calculator multiplies the per-unit distance to your stop by the number of units, giving the dollar risk — and the same for reward at your target.
Will my stop always fill at that price?
Not necessarily. Stops can fill worse during gaps or volatile moves (slippage), so the dollar risk shown is an estimate. This is education, not investment advice.

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Information tool only. Every result is deterministic arithmetic (for the simulator, a probability estimate) from the numbers you enter. No live data, no account connection, nothing stored. This is not investment, trading, tax, or financial advice — verify against your own broker or prop firm before acting.
Disclosure. Some outbound links may be affiliate or partner links; they never change how a tool computes.
Position Math · updated 2026-06-27 · all calculators
Information tool only — not investment, trading, tax, or financial advice. All computation runs in your browser.