Is this compounding calculator a prediction of returns?

No. It projects fixed arithmetic under constant weekly assumptions. Real weeks vary and losing months are normal.

What is a realistic R per week trading gold?

0.5R to 1.5R for a disciplined trader taking two to four high-quality setups a week in the London and New York sessions.

Weekly growth is risk multiplied by R banked, so doubling risk doubles growth and roughly doubles drawdown depth.

Withdrawals flatten the curve because withdrawn cash no longer compounds, but they realise an otherwise unstable asset.

Weekly growth on a fixed-fractional account is risk per trade multiplied by the R banked that week, compounded on the balance.

This is a projection of arithmetic under constant assumptions, not a forecast and not a promise of returns.