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How to Calculate Lot Size
A safe lot size is calculated from your risk per trade and your stop loss distance. That’s what keeps losses consistent — even when different trades have different stop sizes.
Use the steps below to understand the logic. If you want a quick number first, add the mini calculator on this page and then come back to the explanation.
Risk warning: This content is for educational purposes only and not financial advice. Forex trading involves risk, and you can lose money.
Risk-based lot sizing (the calm approach)
Lot size shouldn’t be a guess. It’s the result of your risk rule and your stop loss. When youelke trade dezelfde “max loss” heeft, wordt je trading meteen stabieler.
- Risk amount: how much you can lose on this trade
- Stop pips: the distance to where your idea is invalid
- Pip value: converts pips into money
- Goal: stop pips × pip value ≈ risk amount
Pick risk first. Lot size is the result.
Lot size calculator (quick estimate)
Inputs
Fill this if you prefer fixed € risk. If empty, we use balance × risk%.
Not sure? Use Pip Value to estimate money per pip.
Results
Risk used
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Suggested lots
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Est. loss at stop
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“If the stop is 25 pips, your size should make that cost acceptable.”
Estimate only. Spread/slippage and broker rounding can change the real result.
Before you calculate: set a risk rule
A calculator can’t pick your risk for you. Choose a simple rule and keep it consistent (example: 1% per trade or a fixed € amount). Consistency matters more than perfection.
- Fixed %: scales automatically as your account grows or shrinks
- Fixed € risk: easy to follow, great for beginners
- Rule of thumb: if three losses in a row makes you panic, your risk is too high
How to calculate lot size (risk-based)
- Decide your risk per trade: example: 1% of your account.
- Choose a logical stop loss: structure-based, not random.
- Measure the stop distance: in pips.
- Pick the lot size: use pip value and distance to match your risk.
Lot size formula (simple version)
- Risk amount: account balance × risk percentage.
- Match size to risk: choose a lot size so that (pip value × stop loss pips) ≈ risk amount.
- Tip: most platforms or a pip value calculator can estimate pip value for you.
Example (beginner-friendly)
- Account: €1,000. Risk: 1% → €10 risk.
- Stop loss: 25 pips. Your job is to pick a lot size where 25 pips ≈ €10 loss.
- Adjust: if your platform shows ~€20 risk, reduce lot size. If it shows ~€5, increase slightly.
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