Every year, a huge share of new traders lose most of their account within three months. Not because they can't read a chart — because they never learned three numbers that matter more than any indicator: risk per trade, position size, and the math of losing streaks. This post walks through each one with a real example.
Before entry, stop-loss or indicator, one question decides everything: if this trade goes wrong, how much money do I lose?
The common professional answer is 0.5–1% of the account per trade. At 1%, ten losses in a row — which happens to good traders — costs about 10% of the account. Painful, survivable. At 5%, the same streak cuts the account nearly in half, and the win rate needed to climb back balloons. Read that again: the same trading skill, two completely different outcomes, decided before the trade.
Risking "1%" is not a position size. It's an input. The size of the trade depends on how far away your stop is:
Lots = (Balance × Risk %) ÷ (Stop loss in pips × Pip value per lot)
Example: $1,000 account, 1% risk ($10), 25-pip stop on EURUSD where a pip is worth $10 per standard lot. That's $10 ÷ $250 = 0.04 lots. Same account, same risk, but a 50-pip stop? 0.02 lots. The stop distance changed — the size must follow.
This is exactly what our position size calculator automates, including broker specifics like volume step and minimum lot. One warning it will teach you the honest way: if the calculated size falls below your broker's minimum, the trade does not fit your risk — rounding up silently breaks the budget.
A strategy with a genuine 50% win rate will still produce 5–8 loss streaks regularly, and 10+ over a few hundred trades. Streaks are not a bug; they're weather. The question is only whether your account survives the weather:
| Risk per trade | 10 losses in a row costs |
|---|---|
| 0.5% | ~5% of account |
| 1% | ~10% of account |
| 2% | ~18% of account |
| 5% | ~40% of account |
Surviving is the whole game, because a strategy only gets to prove its edge if the trader is still there. That's also why risk-reward ratio matters more than win rate: at 1:3, you can be right only 4 times in 10 and still grow.
None of this is exciting. That's the point — boring numbers are what keep you in the game long enough to get good. Our pip value table and margin calculator cover the rest of the arithmetic.
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