Forex Lot Size Calculator — Trade the Right Size Every Time

Calculate the exact lot size for any pair, account size, and risk level. Stop guessing — let the math protect your capital.

What Is a Lot in Forex?

A lot is the standardized trade size in forex. Standard Lot = 100,000 units (~$10/pip on majors). Mini Lot = 10,000 units (~$1/pip). Micro Lot = 1,000 units (~$0.10/pip). Nano Lot = 100 units (~$0.01/pip, offered by some brokers). Smaller lot sizes let you scale risk precisely to your account balance.

The Lot Size Formula

Lot Size = (Account Balance x Risk %) / (Stop Loss in Pips x Pip Value per Standard Lot). Example: $5,000 account, 1% risk ($50), 25-pip stop loss on EUR/USD ($10/pip per standard lot). Lot Size = $50 / (25 x $10) = 0.20 lots. The calculator above handles this instantly for any pair.

Lot Size by Account Balance

For a $100 account: stick to 0.01 lots (micro) maximum. For $500: 0.01-0.05 lots. For $1,000: 0.02-0.10 lots. For $10,000: 0.20-1.00 lots. For $100,000: 2.00-10.00 lots. Always size based on stop loss distance — wider stops require smaller lot sizes to maintain the same dollar risk.

Lot Size for Gold (XAU/USD)

Gold is more volatile than forex. 1 standard lot of XAUUSD = 100 oz, ~$10 per pip ($0.01 movement). For a $1,000 account risking 1% with a $5 (500-pip) stop: Lot Size = $10 / (500 x $0.10 per micro lot) = 0.02 lots. Always reduce gold lot sizes due to higher volatility and wider spreads.

Auto-Sizing with SignalPro

SignalPro Auto-Trade calculates lot sizes automatically using your live account balance and the signal's stop loss distance. Connect your MT4/MT5 account, set your risk percentage (default 1%), and every trade is sized correctly — no manual math required. Works on all major forex pairs, gold, silver, indices, and crypto.

Frequently Asked Questions

What lot size should I trade with $100?
With $100, trade 0.01 lots (micro lot) maximum. A 1% risk = $1 per trade. With 0.01 lots and a 50-pip stop on EUR/USD, your risk = $0.50 — perfect for learning without account-blowing risk.
How do I calculate lot size for gold?
For gold (XAUUSD): 1 standard lot = $10 per pip ($0.01 move). For a $5,000 account, 1% risk ($50), with a $3 (300-pip) stop: 0.17 lots. Use micro lots (0.01) for gold on small accounts.
What is the difference between lot sizes?
Standard Lot (1.0) = 100,000 units, $10/pip. Mini Lot (0.1) = 10,000 units, $1/pip. Micro Lot (0.01) = 1,000 units, $0.10/pip. Smaller = lower risk per pip movement.
Can I lose more than my account with leverage?
Yes — without negative balance protection. ESMA-regulated brokers (UK/EU) provide negative balance protection by law. Always check your broker offers it before trading leveraged products.

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