Write the assumptions before the result
Keep an entry record with cash, currency, fee basis, quantity increment and the time the hypothetical prices were selected. Distinguish an example from an executable quote. If you change the stop price, recalculate both the price distance and the fee component. If you change the instrument, verify that this model still applies; a contract multiplier is not an extra decimal place in the quantity field.
Reconcile the cash and loss views
Cash committed at entry and loss at a stop answer different questions. A position can fit a risk budget while requiring more cash than is available, which is why the model applies both caps. Review entry charges separately from exit charges, then preserve the rounded quantity. Use broker documentation for the actual order type and seek qualified assistance for decisions the arithmetic cannot answer.
Work through the numbers
With $10,000 cash, a 1% budget, $50 entry, $48 stop, $56 target and 0.1% fees on each side, the model allows 47 whole units. Entry cash is $2,352.35 including its fee. The stop scenario loses $98.61 and the target scenario gains $277.02 after modeled fees. Neither outcome is a forecast.
Open the position size & risk calculator and reproduce the example first. Keep its default inputs unchanged for that check, then replace one value with the value from your own record. Note the resulting difference before changing anything else. This separates a deliberate scenario from an accidental mixture of old and new assumptions.
Compare a second scenario on the same basis
A market may allow only whole shares or another minimum quantity. Rounding down can leave part of the risk budget unused. The available-cash cap can reduce the position again. Neither difference is an error: the displayed quantity respects the increment and the cash inputs rather than assuming fractional units are always available.
Keep the same unit convention and model boundary when comparing both records. A different tool may represent a different quantity even when its result looks similar. Write down what changed and why, rather than preserving only the final number. If a measurement is uncertain, test a clearly labeled alternative instead of hiding the uncertainty inside an unrelated field.
Use a short review worksheet
- Enter cash available for this scenario, rather than borrowed buying power.
- Choose hypothetical entry, stop and target prices in the same currency.
- Enter per-side percentage fees and the tradable unit increment.
- Compare rounded units, required cash and modeled outcomes; verify actual broker rules.
Add the date of the source or measurement where it matters, and keep any rounding decision separate from the unrounded calculation. Before using a result outside the model, return to the source that governs the real situation. Educational arithmetic only. No trading signals, leverage, derivatives, short positions, tax calculation or investment recommendation. A stop is not a guarantee of an execution price.
Sources and next steps
These references provide topic context; they are not an endorsement or a claim of continuous monitoring. This guide was prepared with AI-assisted drafting, and its illustrative arithmetic is checked against the supplied calculator. No named expert review, product test or site inspection is claimed.
Continue with the calculator and complete method, read how corrections are handled, or report a reproducible issue. Keep personal identifiers, credentials and private documents out of a calculation report.