Lot calculator

One page in the app sits beside copying rather than driving it. It changes nothing about what a repeater does — it is a calculator you can check a number against before you set one up.

Lot Calculator

Always available, in the sidebar under Trading. The same calculator is published on the public site — it is one component, so both give the same answer. A toggle at the top picks between two independent modes.

Position size and risk, the default, sizes one trade on one account. It takes the account balance, the percentage of it you are prepared to lose, the stop-loss distance in pips or points, and what one pip or point is worth on a 1.00-lot position. The lot it returns is the balance times the risk percentage, divided by the stop distance times the value per pip. The default value per point, $10, is approximately a USD-quoted FX major; JPY pairs, metals, indices and crypto differ, so set your instrument's own.

The dollar figure shown beside that lot is the risk you asked for, not the risk of the lot returned. The lot is rounded, so the real risk of the rounded lot sits a little either side of it.

Copy sizing works out what a repeater would place on a follower account:

• Equity ratio — follower lot = source lot × (follower equity ÷ source equity).
• Fixed multiplier — follower lot = source lot × the multiple.
• Max volume — caps the result afterwards. Left empty it is unlimited.
• Quantity rounding — Floor, Round or Ceiling at the lot step. Floor is the default here and on a repeater, so a follower never exceeds the size intended for it.

A stop-loss and pip value are optional in this mode; supply them and the dollar risk of the follower lot is shown too. The sizing rules and the cap are the same ones a repeater carries — see Repeater settings.

⚠️ The calculator assumes a 0.01-lot step, and treats 0.01 as the smallest order that can be placed. A repeater does not: it snaps each follower lot to the volume step the follower's broker reports for that instrument, and falls back to 0.01 only when the broker reports none. Where the step is coarser — some indices and crypto instruments step in 0.1, 1 or more — the lot actually placed can differ from the figure here by one step, and a size the calculator shows as placeable can be under that instrument's real minimum.

Two further differences. A repeater also applies the follower broker's own per-order ceiling, after your own cap; the calculator does not know it. And equity ratio only means something when both equities are in one currency: when the two accounts hold known and different deposit currencies a repeater falls back to the multiplier rather than divide figures that do not compare, because no exchange rate is ever invented. The calculator has no currency field, so it always divides.