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Position Size Calculator (Forex Lot Size)

Work out the right position size for any trade: enter your account balance, how much you’ll risk and your stop loss, and get the lot size in standard, mini and micro lots. Works for every major pair, JPY pairs and gold.

Your trade
Advanced: pip size and contract size

Defaults: 0.0001 for most pairs, 0.01 for JPY pairs. Metals use a price step of 0.01 (gold) or 0.001 (silver) and 100 oz / 5,000 oz lots, but brokers differ, so check your broker’s contract specification.

Result
Position size
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standard lots
Units
—
Mini lots
—
Micro lots
—
Amount at risk
—
Pip value
—
for this position
Risk : reward
—
Profit at take profit
—

How to calculate position size in forex

Position sizing turns “how much am I willing to lose?” into “how big should this trade be?”. The formula is:

Position size (units) = Amount at risk ÷ (Stop loss in pips × Pip value per unit)
  1. Decide your risk. Many traders risk a fixed 0.5–2% of their balance per trade. On a 10,000 account, 1% is 100.
  2. Measure your stop loss in pips, from entry to where the trade idea is proven wrong.
  3. Find the pip value. One pip on EUR/USD is 0.0001, worth $10 for a standard lot (100,000 units) when your account is in USD.
  4. Divide. 100 ÷ (20 pips × $0.0001 per unit) = 50,000 units = 0.50 lots.

Lot sizes explained

LotUnitsPip value on EUR/USD (USD account)
Standard100,000$10.00
Mini10,000$1.00
Micro1,000$0.10

When you need a conversion rate

Pip value is in the pair’s quote currency (the second one). If that’s your account currency, no conversion is needed. If your account is in the base currency, the calculator uses the price you enter. For any other combination, for example GBP/JPY in a USD account, enter what 1 JPY is worth in USD. You can read it from a chart: for USD/JPY at 150, 1 JPY = 1 ÷ 150 = 0.00667 USD.

Risk to reward

Add a take profit and the calculator shows your risk:reward ratio. At 1:2, a winning trade makes twice what a losing one loses, so you can be right less than half the time and still come out ahead before costs. Use TradingView’s Long Position and Short Position drawing tools to see the same ratio on the chart.

Trading crypto with leverage? Use the crypto position size & leverage calculator, which also estimates your liquidation price.

Also see: pip value calculator, profit calculator and forex market hours.

ChartWatch is independent and not affiliated with TradingView or any broker. These calculators use only the numbers you enter; they don’t fetch live prices. Results are estimates: spreads, commissions, swaps and your broker’s contract sizes change the real figures. This is a calculation tool, not financial advice.

FAQ

How do I calculate lot size in forex?
Divide the amount you are willing to lose by your stop loss in pips times the pip value per unit, then divide the units by 100,000 for standard lots. Risking $100 with a 20-pip stop on EUR/USD gives 50,000 units, or 0.50 lots.
How much should I risk per trade?
Many traders risk between 0.5% and 2% of their account per trade, so a losing streak doesn't wipe out the account. The right amount depends on your strategy and tolerance; this calculator works with any percentage or fixed amount.
What is a pip?
For most currency pairs a pip is 0.0001, the fourth decimal place. For pairs quoted in Japanese yen, such as USD/JPY, a pip is 0.01.
How much is 1 pip worth on a standard lot?
On pairs quoted in USD, such as EUR/USD and GBP/USD, one pip on a standard lot of 100,000 units is worth $10. On other pairs it depends on the quote currency and the exchange rate.
What is a mini lot and a micro lot?
A mini lot is 10,000 units (0.1 standard lots) and a micro lot is 1,000 units (0.01 standard lots).
Does this calculator work for gold (XAUUSD)?
Yes, with a caveat. It defaults to a 0.01 price step and 100 ounces per lot, which many brokers use, but contract sizes vary. Check your broker's specification and adjust the advanced settings.

More free TradingView tools

Pip Value CalculatorWhat one pip is worth for any pair, lot size and account currency. Crypto Leverage CalculatorCrypto position size, margin, liquidation estimate and max leverage. Forex Profit CalculatorProfit or loss in pips and money from entry, exit and lot size. Forex Market HoursLive Sydney, Tokyo, London and New York sessions in your time zone.
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ChartWatch is an independent tool and is not affiliated with, endorsed by, or officially connected to TradingView, Inc. “TradingView” is a trademark of its respective owner. Exchange, broker and platform names are trademarks of their respective owners.