Lot size calculator
How many lots to trade so that hitting your stop loss costs exactly the amount you chose to risk.
1 pip = 0.00010
- Amount at risk
- 100.00 USD
- Risk after rounding
- 100.00 USD
- Pip value per lot
- 10.00 USD
- Mini lots
- 2.0
- Micro lots
- 20
- Units
- 20,000
Prices: bid and ask from our partner brokers' MT5 servers, updated every 5 minutes. Last update 2026-10-23 20:58 UTC. The market is closed, so these are the last prices before the close.
How the lot size is calculated
First the calculator turns your risk percentage into money. Then it divides that amount by the stop loss distance and by what one pip is worth for one lot in your account currency.
One pip is 0.0001 for most pairs and 0.01 for pairs quoted in yen, gold and silver. When the quote currency differs from your account currency, the pip value is converted at the live rate.
Amount at risk = balance × risk %Lots = amount at risk ÷ (stop loss in pips × pip value of 1 lot)
Questions
What is the 2% rule?
A common guideline: never risk more than 2% of your balance on one trade. Ten losses in a row at 2% leave about 82% of the account, which you can recover from. Many traders use 1% or less.
Why is the result rounded down?
Brokers accept volume in steps of 0.01 lot. Rounding up would make the trade risk more than you chose, so the calculator always rounds down and shows the risk after rounding.
Does leverage change the lot size?
No. Leverage changes the margin a trade needs, not what a pip is worth. The amount you lose at the stop loss depends only on the volume and the distance to the stop.
Can I use it for gold?
Yes. Choose XAU/USD. One lot of gold is 100 ounces and one pip is 0.01, so a pip is worth 1 USD per lot. A 300 pip stop on gold is a 3.00 USD move in price.
Trade the same, pay less
Every lot you trade pays spread or commission. Open your account through AutoFXRebate and the broker pays part of that cost back to you as a rebate.
Trading forex and CFDs on margin carries a high risk of losing money. These tools give estimates for planning and education, not investment advice.