Trading Tool

Lot Size Calculator

Calculate how many lots to trade based on your account size, risk amount, and stop loss. This keeps the math simple and helps you avoid oversized trades.

Control risk before entry Built for prop firm rules Instant calculation
Risk Rule Never risk what you cannot recover.
1%

Most funded traders risk between 0.25% and 1% per trade to protect drawdown and stay consistent.

Position Size

Calculate Your Trade

Live Math
Pip value can vary by broker, symbol suffix, and contract specification. Use this calculator as a planning tool and confirm values inside your trading platform.
Trading Education

Position Size Calculator for Forex, Gold and Prop Firm Challenges

The WePassChallenges Position Size Calculator helps traders answer one of the most important questions before placing a trade: how big should my lot size be? Instead of guessing, the calculator starts with your account size, the percentage or dollar amount you want to risk, and the distance between your entry and stop loss. From there, it estimates a position size that keeps the possible loss close to your planned risk.

This is especially important for prop firm traders because one oversized trade can damage a challenge, break a daily drawdown rule, or put the account close to the maximum loss limit. A trader can have a good technical setup and still fail if the lot size is too large for the stop loss being used. This tool is built to make that math simple and beginner friendly.

Use the calculator before entering forex pairs such as EURUSD, GBPUSD and USDJPY, and also before trading Gold, indices, or crypto. Broker contract sizes can vary, so always confirm pip value and symbol specifications inside MT5, TradeLocker, cTrader, or your prop firm dashboard before placing live trades.