Forex Position Size Calculator
Calculate the perfect position size for your trades based on your account size, risk tolerance, and stop loss distance.
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Quick answer
Forex position size = the dollar amount you're risking ÷ (stop-loss distance in pips × pip value). Risking 1% of a $10,000 account with a 40-pip stop on EUR/USD (where one pip is $10 per standard lot) gives $100 ÷ (40 × $10) = 0.25 lots.
What is the Forex Position Size Calculator?
Here's what kills most trading accounts: random lot sizes. A trader risks 0.5 lots on one trade, 0.2 on another, with no logic behind either choice. Then one bad trade wipes out five winners.
Position sizing fixes that. You pick how much you're willing to lose (say, 1% of your account), measure your stop-loss distance, and the math tells you exactly how many lots to trade. Same risk every time, regardless of where your stop goes.
The Math (It's Actually Simple)
Three things matter: your risk in dollars, how far your stop is, and what each pip costs. That's it.
Lots = Risk Amount ÷ (Stop Distance × Pip Cost)
Say you've got $10,000 and want to risk 1%. That's $100 on the line. Your stop is 40 pips away on EUR/USD, where each pip costs $10 per lot:
$100 ÷ (40 × $10) = 0.25 lots
Tighter stop? You can trade bigger. Wider stop? Trade smaller. The dollar risk stays the same either way.
How to Use This Calculator
Using This Calculator
- Account balance — What you actually have right now, not what you deposited six months ago.
- Risk percentage — 1-2% is standard. Go higher and you're gambling, not trading.
- Stop-loss in pips — Measure from your entry to your stop. A 30-pip stop isn't the same as a 100-pip stop.
- The result — That's your lot size. Type it into MT4/MT5 exactly as shown.
Do this before every trade. Your lot size changes based on where you're putting your stop.
Real-World Example
Real Trade Example
You spot a setup on GBP/USD:
- Account: $8,500
- Risk: 2% ($170)
- Stop: 35 pips below entry
- GBP/USD pip value: $10/lot
$170 ÷ (35 × $10) = 0.49 lots
Round down to 0.45. If stopped out, you lose about $157 — stays within your 2% rule. Hit your target 35 pips up, you pocket the same amount. That's symmetry.
When to Use
When Does This Matter?
Every single trade. No exceptions. Here's why:
- A breakout trade might need a 20-pip stop. A swing trade might need 80. Same lot size? Totally different risk.
- Won three trades in a row? Your account grew. Your 1% is now a bigger number.
- Trading EUR/JPY instead of EUR/USD? Different pip values.
Traders who use the same lot size for everything are inconsistent without knowing it. A 20-pip stop at 1 lot risks $200. A 100-pip stop at the same lot size? $1,000. That's not a system — that's chaos.
Common Mistakes
Where Traders Go Wrong
- "I always trade 0.1 lots" — Cool, so sometimes you're risking $50 and sometimes $300? That's not a strategy.
- 5% risk per trade — Math check: a 10-trade losing streak (it happens) wipes out half your account. At 1%? Same streak costs you 10%.
- Forgetting about pip value — GBP/JPY doesn't have the same pip value as EUR/USD. Neither does any cross pair.
- Rounding up — Calculator says 0.37 lots? Trade 0.35. Never bump up to 0.40 because it's "close enough."
Use Together With
Pip Value Calculator
Instantly calculate the monetary value of each pip movement for any currency pair and position size.
Risk-Reward Calculator
Determine your risk-reward ratio and the minimum win rate needed for profitability.
Margin Calculator
Determine the exact margin required for your trades based on position size, currency pair, and leverage ratio.
ATR Position Size Calculator
Calculate position size based on ATR (Average True Range) for volatility-adjusted risk management.
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Pip Value
Free pip value calculator for forex. Find the exact dollar value of each pip for any currency pair, lot size, and account currency. Supports majors, crosses, and exotics.
Risk-Reward
Free risk-reward ratio calculator for forex. Enter entry, stop loss, and take profit to see your R:R ratio and the minimum win rate needed to be profitable.
Margin
Free forex margin calculator. Calculate the exact margin required for any position size and leverage ratio. Supports all currency pairs and leverage levels from 1:30 to 1:1000.
ATR Position Size
Free ATR position size calculator. Calculate volatility-adjusted position sizes using Average True Range. Dynamically sizes your stop loss and lot size based on market conditions.