A tool, not a trading signal
Size the position.
Respect the budget.
Enter your own assumptions. Estimate stop-based cash risk, allow for friction, and round down to the instrument’s unit increment.
43 units
Whole units · rounded down
- Cash risk budget
- $100.00
- Risk per unit, including friction
- $2.30
- Estimated cash loss at stop
- $98.90
- Unallocated budget
- $1.10
Gaps, insufficient liquidity and order mechanics can produce worse fills. The tool does not calculate margin, currency conversion or correlated exposure.
The calculation, in plain sight.
Budget = equity × risk percentage ÷ 100
Unit risk = (|entry − stop| + adverse slippage) × cash point value + round-trip fees
Size = floor((budget ÷ unit risk) ÷ unit increment) × unit increment
For a long position, the protective stop is normally below entry; for a short position, above it. The calculator uses absolute distance and does not decide trade direction. Cash-per-point must already match your instrument, unit definition and currency.
Understand the assumptions before using the result →