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Position size calculator

Compute how many shares to buy so you risk a fixed percentage of your account.

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Need Shares to buy, Amount at risk? The Position size calculator derives it from Account size, Risk per trade (%), Entry price, Stop-loss price in one step. For instance, with Account size = $10,000.00, Risk per trade (%) = 2, Entry price = $50.00 and Stop-loss price = $48.00 it returns Shares to buy = 100 and Amount at risk = $200.00.

How to use it

  1. Enter your values: Account size, Risk per trade (%), Entry price, Stop-loss price.
  2. Read the result instantly: Shares to buy, Amount at risk.

Frequently asked questions

How does the Position size calculator work?

It takes Account size, Risk per trade (%), Entry price and Stop-loss price and derives Shares to buy and Amount at risk from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

4 values: Account size ($), Risk per trade (%), Entry price ($) and Stop-loss price ($). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Account size = $10,000.00, Risk per trade (%) = 2, Entry price = $50.00 and Stop-loss price = $48.00, the calculator returns Shares to buy = 100 and Amount at risk = $200.00. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Account size = $20,000.00, Risk per trade (%) = 4, Entry price = $100.00 and Stop-loss price = $96.00 instead, Shares to buy goes from 100 to 200 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Account size = $5,000.00, Risk per trade (%) = 1, Entry price = $25.00 and Stop-loss price = $24.00, Shares to buy comes out at 50. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Comparing two investments that pay at different times, deciding whether a project clears its cost of capital, and sanity-checking a valuation someone else produced.

What is the most common mistake?

Trusting a valuation without asking what share of it comes from the terminal value. Past 70%, the answer is an assumption about the distant future dressed up as a calculation.

How accurate is it, and what are the limits?

Estimate only — not financial advice.

What is the difference between the Position size calculator and the Break-even price calculator?

This one returns Shares to buy and Amount at risk; the Break-even price calculator returns Break-even sell price and Minimum gain needed. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Crypto DCA calculator is the closest one after this: Dollar-cost averaging: enter your fixed buy amount and the prices you bought at, and get coins accumulated, true average cost, current value and profit/loss. Break-even is your average cost — you are ahead the moment price passes it.

Further reading

All guides →
GuidePosition Sizing: What the 1 Percent Rule Actually ConstrainsThe rule caps the loss, not the position. Here is the formula, a worked example, and what a run of ten losses costs at 1 percent versus 2 percent.GuideWhere to Set a Stop-Loss and a Take-ProfitThe stop goes where your idea is wrong, not where your comfort runs out — and then the position size adapts to it. Here is the volatility argument, the sizing arithmetic, and the win rate each reward multiple demands.ExplainerRisk/Reward Ratio Explained: The Win Rate Each Ratio RequiresA 1:3 ratio does not make you right more often — it lets you be wrong three times out of four and still break even. Here is the inversion, a table of ratio against required win rate, and what costs do to both.How-toHow to Calculate Your Liquidation Price on a Leveraged PositionThe liquidation price follows directly from your leverage: at 10x a 10 percent move wipes you out. Here is the formula, the maintenance margin that moves it closer, and how to read the number before you open.ExplainerWhat Is a Funding Rate? The Recurring Cost of Holding a PerpetualFunding is paid every eight hours on the full notional, between traders rather than to the exchange. A rate of 0.01 percent looks like nothing and costs 10.95 percent a year. Here is the formula and an annualised table.ExplainerLeverage, Liquidation, and the Asymmetry of LossesLiquidation distance is (1 ÷ L − m) ÷ (1 − m): at 20× that is 2.56 percent on a 2.5 percent maintenance margin, inside a normal day. Recovering a loss needs 1 ÷ (1 − L) − 1, so 90 percent lost needs 900 percent back. Combined, repeated leveraged bets on a market with a genuine +0.08 percent edge compound at −1.23 percent per period at 10×.