The three sizes.
- Standard lot = 100,000 units of base currency; about $10 per pip on EUR/USD.
- Mini lot (0.10) = 10,000 units; about $1 per pip.
- Micro lot (0.01) = 1,000 units; about $0.10 per pip.
The formula.
Lot size = (account × risk %) ÷ (stop in pips × pip value per lot).
Example: $50,000 account, 0.5% risk = $250. Stop of 25 pips on EUR/USD at $10/pip per lot: 250 ÷ (25 × 10) = 1.0 lot.
Gold and indices.
Contract sizes differ by instrument. On MT5, open the symbol specification to see the contract size and tick value before you size a trade on XAU/USD or an index.
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