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Calculateur de la taille des positions en actions et en devises

DonnéesPromoteurMathématiques

[iotools_stock_forex_position_size_calculator]

Guide

Calculateur de la taille des positions en actions et en devises

Trade like a risk manager, not a gambler. This position size calculator turns your account balance and risk tolerance into the exact number of shares, forex lots, or crypto units to buy — so a single losing trade can never blow up your account. Enter your entry price, stop-loss, and an optional take-profit and the tool recalculates instantly, showing your max dollar risk, potential profit, and risk-to-reward ratio.

Comment utiliser

Choisir un mode : Stocks, Forex, ou Crypto.
Enter your account balance and select your account currency.
Choose whether to risk a percentage (recommended: 1-2% per trade) or a fixed amount.
For forex trades, pick a pair preset (EUR/USD, USD/JPY, etc.) to auto-fill pip size and pip value, or enter custom values.
Enter your entry price et stop-loss price.
Optionally add a take-profit price to see risk:reward, potential profit, and the break-even win rate.
Read your position size in the summary — that is the maximum trade size that respects your risk limit.

Caractéristiques

Three asset classes – Stocks return whole shares, crypto returns fractional units, forex returns lots plus underlying units.
Two risk modes – Risk by percentage of account or by fixed currency amount.
Forex pair presets – EUR/USD, GBP/USD, AUD/USD, NZD/USD, USD/JPY, USD/CHF, USD/CAD, EUR/JPY, GBP/JPY plus custom mode for any other pair.
Lot breakdown – See standard lots (100,000 units), mini lots (10,000), micro lots (1,000), and stop distance in pips at the same time.
Auto-recalculate – Every result updates as you type. No submit button needed.
Trade direction detection – The tool figures out whether you are going long or short from your entry-vs-stop prices.
Risk:reward and break-even win rate – If you set a target, see how often you must be right just to break even at that R:R.
Risk-of-account warnings – The result box turns yellow above 2% risk and red above 5%, even if the math is correct.
Affichage multi-devise – Show results in USD, EUR, GBP, JPY, AUD, CAD, or CHF.
Première confidentialité – All math runs in your browser. Your account size and trade plan are never sent to a server.

Who This Is For

Day traders, swing traders, and active investors managing their own risk. Especially useful for newer traders who want a repeatable sizing rule, and for forex traders who hate doing pip-to-dollar math by hand on every setup.

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 FAQ

What is the 1% rule in trading?

The 1% rule says you should never risk more than 1% of your total account balance on a single trade. If your account is $10,000, the most you should lose if your stop-loss is hit is $100. Position sizing turns that risk limit into the number of shares, lots, or coins you can actually buy.
Why is risk:reward more important than win rate?

A high win rate looks impressive but loses money fast if losing trades are larger than winners. With a 1:2 risk:reward, you only need to be right about 34% of the time to break even. With 1:3, you only need 25%. Position sizing combined with a favorable R:R is how professionals stay profitable despite losing more trades than they win.
What is a pip in forex trading?

A pip (price interest point) is the smallest standardized price move in a currency pair. For most pairs it is 0.0001 (the fourth decimal). For JPY-quoted pairs like USD/JPY it is 0.01 (the second decimal). Pip value depends on lot size: on a standard lot (100,000 units) of a USD-quoted pair, one pip is worth $10.
How are forex lots structured?

Standard lot = 100,000 units of the base currency. Mini lot = 10,000 units. Micro lot = 1,000 units. Nano lot = 100 units. Retail traders most often use mini or micro lots so that single-pip moves represent small dollar amounts that fit within reasonable risk limits.
What is the Kelly criterion and how does it relate to position sizing?

The Kelly criterion is a formula for the optimal fraction of capital to risk per bet, given a known edge and payoff ratio. In trading, full Kelly is usually too aggressive because edge and payoffs are estimates, so most traders use a fraction (half-Kelly or less). Fixed-percent sizing like 1-2% per trade is a simple, conservative approximation of fractional Kelly.

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