The most important asymmetry in trading: losses need bigger gains to undo. Drag the slider.
This is why the position size calculator starts from risk, and why the IB directory sorts by drawdown first.

30%
recovery% = loss ÷ (1 − loss)
+42.9%
Account drops 30%: $10,000 → $7,000.
To get back to $10,000 from $7,000, you need +$3,000 on a $7,000 base.
$3,000 ÷ $7,000 = 42.9% — nearly 1.4× the size of the original loss, in percentage terms.
The single most under-priced fact in trading: losses and the gains that undo them are not symmetric.
A 50% loss doesn't need a 50% gain to recover — it needs 100%. The deeper the hole, the faster this ratio runs away from you.
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Common mistake: sizing positions as if losses and gains were symmetric. This is exactly why the position size calculator starts from a risk percentage — small, consistent risk keeps you off the steep part of this curve.