Position Size
Calculator
Precision toolkit · 28 major pairs · any account currency · verified maths — every calculation tested against ten worked examples
Read before relying on any figure. This is an educational tool, not financial advice and not a personal recommendation. Mud to Margin provides algorithmic trading software and education only and is not authorised or regulated by the FCA.
Rates. Conversion-dependent results use the rate you enter. Take it live from your own broker platform — that rate is the only one true for your account. This tool holds no price feed and reflects no specific broker's data.
Costs are not included. Spread, slippage, swap and commission sit outside this calculation. Spread effectively widens your entry — plan your stop with it in mind.
Pip-value drift. Where your account currency is the base of the pair (e.g. a USD account trading USDJPY), pip value moves with price, so realised risk can differ fractionally from the figure shown. This is inherent to the instrument and true of every position calculator.
Direction-independent. Position size depends only on stop distance and risk — long or short makes no difference.
Verify it. Enter identical inputs and the identical rate into any professional position size calculator and the figures match. The tradeable size shown here is deliberately rounded down to your lot step; the exact unrounded size is shown alongside for comparison. This page also checks itself: add ?test=1 to the end of the web address and the built-in test suite runs all ten worked examples in front of you.