Free calculators that do the honest arithmetic

Size every trade to a fixed fraction of risk — not a gut feeling.

Turns "how many lots?" into arithmetic you can defend at 2am.

The probability your account never comes back.

A number most course-sellers would rather you never calculate.

What one average trade is actually worth, in R and in cash.

If this number is negative, no position size can save you.

Why a 50% loss needs a 100% gain to break even.

The asymmetry that quietly ends most trading accounts.

Realistic growth curves — with the costs and variance left in.

Compounding is real. The screenshots on Instagram usually are not.

Prop-firm Monte Carlo — what are your real odds of passing?

Higher risk speeds up passing — and speeds up busting. Test before you pay the fee.

"$0 commission" is a lie — see the drag from spread + commission on your real volume.

Standard vs raw ECN — the math shows which actually costs less at your lot count.

The hidden per-night tax that quietly eats swing-trade profit.

A 14-day hold can pay half its target back to the broker. See it before you enter.