Lot Size Calculator — Forex, Metals, Indices & Crypto

Position sizing for all instruments in your account currency. R:R scenarios, losing streak simulator, live ECB rates. No sign-up required.

Position Sizing & Streak Simulator

Instrument & Account

Instrument

Account currency

Account balance

Risk Parameters

Risk per trade

Stop-loss

pips

R:R Scenarios

Entry price (optional)

Streak length

trades

Recommended Lot Size

—

Amount at risk

—

Per-pip value

—

% of balance

—

Spread cost

—

R:R Scenarios at this position

R:R	Target pips	If win	Win rate needed

Losing streak simulation — 10 trades

#	Lots	Lost	Balance after

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Account currency flexibility

FxPro supports 15+ account currencies including USD, EUR, GBP, JPY and more. Trading in your local currency eliminates conversion fees on deposit and withdrawal — typically 1–3% at your bank on every transfer. On a $5,000 account that's $50–$150 saved on one round trip.

FCA · CySEC · FSCA · SCB — four independent regulators covering the UK, EU, South Africa and the Bahamas. Client funds are segregated from company funds.

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How to use this calculator

Select your instrument

Choose from forex pairs (majors and crosses), metals (XAU/USD gold, XAG/USD silver), indices (NAS100, US30) or crypto (BTC/USD). The calculator uses the correct pip size and contract specifications for each instrument class.

Set account balance and risk %

Your balance is the full account equity. Risk % is the portion you plan to lose if stopped out. Most professionals use 1%. The calculator converts this to an exact currency amount at risk, then works backwards to the lot size.

Enter your stop-loss distance

The distance in pips (or points for indices) from your entry to your stop-loss level. The calculator divides your risk amount by the pip value to find the correct lot size. Wider stop = smaller position.

Review R:R scenarios and streak simulation

The R:R table shows how much you make at 1:1, 1:1.5, 1:2 and 1:3 risk-reward with this position size. The streak simulation stress-tests your account across consecutive losses — the most important risk management check.

Frequently asked questions

What is position sizing?

Position sizing is determining how many lots to trade so a losing trade costs exactly the amount you planned. Correct sizing makes risk consistent regardless of which pair you trade or where your stop-loss is.

How does the lot size formula work?

Lots = (Account Balance × Risk%) ÷ (Stop-Loss pips × Pip Value per lot). For EUR/USD with a USD account, pip value is fixed at $10/lot, making the calculation straightforward. For other pairs, the pip value depends on the current exchange rate — the calculator fetches this live from ECB.

How does this work for gold (XAU/USD)?

Gold uses 100 troy ounces per standard lot, pip size $0.01. Pip value = $1.00 per standard lot (fixed). For a $100 risk with a 50-pip stop: lots = $100 ÷ (50 × $1.00) = 2.00 lots. Always verify gold contract specs with your broker.

Why does lot size change on each losing trade in the simulator?

The simulator uses proportional risk — each trade risks the same percentage of the current balance, not the same fixed amount. As balance falls after losses, the amount at risk falls proportionally and lot sizes shrink. This is how professional traders prevent a losing streak from becoming catastrophic.

What does 'spread cost' mean?

The spread cost is the cost of entering the trade from your lot size: spread pips × pip value per lot. This is money paid to the broker on entry, before price has moved. It must be overcome before the trade is profitable.

What is the break-even win rate in the R:R table?

The minimum percentage of trades you need to win to be profitable at that R:R ratio. At 1:2 R:R, you only need to win 33% of trades to break even. At 1:3 R:R, just 25%. This is why R:R matters more than win rate alone.

Lot Size Calculator — Forex, Metals, Indices & Crypto

Lot Size Calculators by Instrument

How to use this calculator

Select your instrument

Set account balance and risk %

Enter your stop-loss distance

Review R:R scenarios and streak simulation

Frequently asked questions

What is position sizing?

How does the lot size formula work?

How does this work for gold (XAU/USD)?

Why does lot size change on each losing trade in the simulator?

What does 'spread cost' mean?

What is the break-even win rate in the R:R table?

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