Position Size Calculator for Stocks, Spot & Futures

Calculate how many shares, units or contracts you can trade based on your account size, chosen risk and stop-loss level. Use the calculator
before entering a trade to understand your potential loss, total exposure and estimated margin requirement.

FREE POSITION SIZE CALCULATOR

Calculate Position Size

Plan Your Risk-Based Position Size

Enter your account risk, planned entry and stop loss. Futures mode also estimates margin at your selected leverage.

Maximum planned risk —
Stop distance —
Risk-based quantity —
Maximum affordable quantity —
Practical quantity —
Position exposure / value —
Capital required (spot) —
Actual risk at stop —

Estimate only. Changing the display currency does not convert values. Fees, spread, slippage, funding, contract multipliers, maintenance margin and liquidation rules are not included.

How to Use the Position Size Calculator

  1. Choose whether the trade is Long or Short.
  2. Select Spot/Stocks or Futures mode.
  3. Enter your trading account balance.
  4. Add the percentage or fixed amount you are willing to risk.
  5. Enter your planned entry and stop-loss prices.
  6. For futures, enter the contract size and leverage details.
  7. Select Calculate Position Size.
  8. Review the quantity, planned risk, exposure and estimated margin before placing the trade.

How Leverage Affects Margin, Not Core Risk

Leverage reduces the estimated initial margin required to hold the calculated exposure. For a 50,000 position, 5× leverage implies roughly 10,000 initial margin. If the stop still fills as entered, planned price risk is unchanged.

Futures also involve maintenance margin, liquidation rules, mark price, funding, fees and exchange-specific contract sizes. High leverage leaves less room for adverse movement and can cause liquidation before a discretionary stop executes.

Important note:
If the result includes a partial quantity that your broker does not support, round it down. Rounding up can increase the trade risk beyond your selected limit.

Risk disclaimer: Futures and leveraged products can produce rapid losses. Margin is an estimate and does not include maintenance requirements, liquidation buffers, fees, funding or platform-specific rules.

More Tools: Trade Planner | Drawdown Calculator | Pre-Trade Checklist | Trading Journal

WHY USE THIS TOOL?

Trade With More Consistent Risk

  • Avoid Oversized Positions
  • Remove Guesswork
  • Understand Exposure and Margin
  • Build Consistent Trade Plans

Position sizing cannot prevent losses, but it can help you understand and control how much of your account is exposed to each trading decision.

position size calculator

“Disciplined traders choose their risk before the market
chooses their loss.

POSITION SIZING EXPLAINED

Benefits of Using a Position Size Calculator

Control Risk Before EntryChoose the maximum loss you are prepared to accept before opening the position. The calculator converts that risk limit into a practical quantity.
Avoid Oversized Trades
A trade should not become larger simply because a broker offers more leverage. Position sizing helps separate planned risk from available buying power.
Create More Consistent Trade PlansUsing the same risk process across trades can reduce emotional decisions and prevent one position from carrying an unintended share of your account risk.

– Frequently Asked Questions (FAQs)

What is a position size calculator?

A position size calculator estimates how many shares, units, lots or futures contracts can be traded based on a defined account-risk limit and the distance between the planned entry and stop loss. It helps convert a risk-management decision into a practical trade quantity.

How is position size calculated?

First, multiply the account balance by the chosen risk percentage to calculate the maximum risk amount. Next, divide that amount by the difference between the entry and stop-loss prices. Futures calculations must also account for the contract multiplier or value per point.

Does leverage increase my safe position size

No. Leverage changes the capital or margin required to control a position, but it should not automatically increase the amount you are prepared to lose. The core risk-based size still depends on your maximum risk and stop-loss distance.

Can I use this calculator for both long and short trades?

Yes. For a long trade, the stop is normally below the entry. For a short trade, it is normally above the entry. The calculator measures the price difference between the entry and stop to estimate the risk per unit.

Can I use the calculator for stocks and cryptocurrency?

Yes. Spot/Stocks mode can be used for shares, ETFs and crypto spot positions when the asset’s quantity is based directly on the entry and stop-loss prices. Make sure the quantity precision supported by the broker or exchange is considered.

What risk percentage should I use per trade?

There is no universal percentage appropriate for every trader. The decision should reflect your financial situation, strategy, volatility, experience, total portfolio exposure and ability to absorb losses. Selecting a commonly mentioned percentage does not make a trade safe.

Why is my calculated position larger when my stop is closer?

A closer stop creates less calculated risk per unit. Therefore, more units fit within the same maximum risk amount. However, a stop placed too close to the entry may be triggered by ordinary market movement, so stop placement should be based on the trade setup rather than the desired quantity.

Is the calculated loss guaranteed?

No. The result assumes the position exits at the entered stop price. Slippage, price gaps, insufficient liquidity, fees and liquidation can make the realised loss larger or smaller than the estimate.

Can the calculator tell me whether I should take a trade?

No. It calculates position size from the information provided but does not assess the quality of a setup, predict market direction or recommend a financial product.