Position Size Calculator
Trading a fixed lot size regardless of your stop-loss distance is one of the most common ways forex accounts blow up. Enter your account balance, risk %, and stop-loss to get the exact lot size to trade.
To calculate position size, enter your account balance, risk percentage, stop-loss distance in pips, and currency pair — the exact lot size to trade is calculated instantly, sized so you risk a fixed dollar amount regardless of stop-loss distance.
Zero Server Uploads
Files process in local RAM
Instant WASM Speed
No waiting queues or lags
Unlimited Batching
Convert files without limits
Suggest a Feature or Improvement for Position Size Calculator
Need custom options, higher limits, or extra format support? Let our engineering team know!
How to use Position Size Calculator
- 1Enter your account balance and how much you want to risk per trade (as a %).
- 2Enter your stop-loss distance in pips.
- 3Select the currency pair, exchange rate, and account currency.
- 4See the exact lot size to trade instantly.
Why fixed lot sizes are dangerous
Trading the same lot size on every trade regardless of stop-loss distance means your dollar risk swings wildly — a trade with a wider stop can lose several times what a tighter-stop trade would. Sizing by a fixed % of account risk keeps every trade's downside consistent.
The formula
riskAmount = accountBalance × risk% ÷ 100. lots = riskAmount ÷ (stopLossPips × pipValuePerStandardLot). This uses the same pip-value calculation as the Pip Calculator, so the two tools always agree.
Frequently Asked Questions
What risk % should I use per trade?
Most risk-management guidance suggests 0.5%–2% of account balance per trade — higher risk per trade means fewer losing trades needed to significantly damage the account.
Why does this need the same inputs as the Pip Calculator?
Position sizing depends on pip value, which depends on the currency pair, exchange rate and account currency — this calculator computes that internally using the same tested logic, so you don't need to run the Pip Calculator separately first.
Is my data uploaded anywhere?
No. Every forex calculator on this site runs entirely in your browser — nothing you enter is sent to a server.