Four free calculators built for gold contract specifications rather than FX pairs: XAUUSD pip value, gold lot size from stop distance, gold margin at leverage from 1:20 to 1:500, and a live gold session clock in UTC.
A standard XAUUSD lot controls 100 ounces, so a one dollar move per ounce is 100 dollars per lot and a normal gold day can travel 25 to 40 dollars. Sizing gold like a currency pair is the most common reason retail accounts fail on the metal.