Methodology
Rounding and precision
We keep calculation precision separate from display formatting so a neat output does not quietly change the risk model.
Internal precision
Calculations use decimal arithmetic with 32 significant digits. Money, percentages, and share counts are formatted only after the calculation finishes.
Display
Most currencies show two decimals; JPY shows zero. Percentage outputs show two decimals. Fractional shares show up to four decimals in the current release.
Conservative share counts
Whole and fractional positions are truncated downward. They are never rounded up through the selected risk or capital limit.