Most accounts don't fail because the strategy was wrong. They fail because the position was too big for the stop loss. This free calculator gives you the exact lot size that risks only what you mean to risk — for any pair, any account, any broker.
Fill in your trade setup on the leftabove
to calculate position size and targets.
The traders who make it don't have a better strategy — they have a better system for knowing exactly why they win and why they lose. This free journal gives you exactly that: auto-calculating stats, win rate, profit factor and a weekly review built in.
Position size is how many units (or lots) of a currency pair you buy or sell on a single trade. It controls one thing: how much money you actually lose if your stop loss gets hit. Get this wrong by even a small amount and a normal losing streak — which every trader experiences — becomes a blown account.
The industry standard is 0.5% to 2% of your account per trade. Most professional traders sit at the lower end of that range. Risking more than 2% is mathematically aggressive: a 10-trade losing streak at 5% risk loses you 40%+ of your account. The same streak at 1% loses about 10%.
The formula is: Risk amount ÷ (Stop distance in pips × Pip value per lot in your account currency) = Lot size. The hard part is the pip value calculation — it changes based on the pair, the quote currency, and your account currency. This calculator handles every combination automatically using live cross rates.
Yes. Set your account balance to the challenge size, then risk a percentage that keeps you safely under the daily and overall drawdown limits. Most prop firm challenges are failed by oversized trades, not bad analysis — exactly what this tool prevents. Detailed firm-by-firm presets are coming soon.
Pip value depends on the quote currency (the second currency in the pair) and your account currency. EUR/USD's pip value is in USD; USD/JPY's is in JPY. If your account is in GBP, every pip value has to be converted back into GBP. This is where most manual calculations go wrong — the calculator does it for you using live cross rates.
Yes — the lot size output works on any platform. We also have a free open-source TradingView indicator that puts the same calculator directly on your chart: drag your entry and stop lines and the lot size updates live in your account currency. Linked above.
It's really free — no signup, no email, no upsell. We make money through optional affiliate links to prop firms and brokers, and only if you choose to use them. The calculator and the TradingView indicator stay free regardless.