Convert between standard, mini, micro, and nano lots. Plus: see the notional exposure on a standard contract, because 1.0 lots on gold is not 1.0 lots on EURUSD.
XAUUSD (gold) has a standard lot = 100 troy ounces. XAGUSD (silver) = 5,000 oz. BTCUSD at most brokers = 1.0 BTC per lot. Don't assume a "1.0 lot gold" position is comparable to "1.0 lot EURUSD" — notional exposure can differ by 5-10x.
Some ECN brokers (Exness, Tickmill) support nano lots (0.001). Most retail brokers cap at 0.01 micro.
0.10 lots × 100 oz = 10 oz exposure. At $2,400/oz that's $24,000 notional — roughly 10x larger exposure than 0.10 lots on EURUSD at 1.10.