Calculators
Practical trading maths — position sizing, R-multiple risk/reward, and compounding.
Position Size
Risk a fixed % per trade
Risk amount$100.00
Position size (units)20.00
Notional exposure$2,000.00
Risk / Reward
R-multiple and break-even win rate
Reward : Risk3.00 R
Break-even win rate25.0%
Compounding
Growth at a fixed rate per period
Ending value$28,003.28
Total gain$18,003.28
Multiple2.80×
Tools for planning, not advice. Position sizing assumes a fixed percentage risk per trade; the break-even win rate is the hit rate needed for a given reward:risk to be profitable before costs. Trade your own plan.