Find the position size that matches your risk before you place a trade. Enter your account balance, how much of it you want to risk and your stop loss in pips, and the calculator shows how many lots to trade, in standard, mini and micro lots and in units.
The risk can be a percentage of your balance or a fixed amount in your account currency. When your account currency differs from the pair's quote currency, the pip value is converted with the latest European Central Bank reference rates, updated every working day; enter your own conversion rate for an exact figure at the current price.
Position size to risk 100.00 USD with a 20 pip stop loss on EUR/USD
0.5 lots
50,000 units · 1 pip = 5.00 USD at this size
- Loss at stop loss
- 100.00 USD
- Account risk
- 1.00%
Risk allocation Low risk
Spread and commission are not included.
| Measured in | Position |
|---|---|
| Standard lots | 0.5 |
| Mini lots | 5 |
| Micro lots | 50 |
| Units | 50,000 |
No conversion: the account is in USD.
ECB exchange rates updated 13 Nov 2026.
How is position size calculated?
Position size in lots = amount at risk ÷ (stop loss in pips × pip value of one lot). With a 10,000 USD account and 1% risk, the amount at risk is 100 USD. A pip on one lot of EUR/USD is worth 10 USD, so a 20 pip stop loss gives 100 ÷ (20 × 10) = 0.5 lots. To see what a pip is worth for any size, use the pip value calculator.
Why is the position rounded down?
Brokers only accept sizes in steps, most often 0.01 lots. The calculator rounds down to the nearest step, so the trade never risks more than you planned: 100 USD with a 30 pip stop on EUR/USD works out at 0.3333 lots, which becomes 0.33 lots and risks 99 USD. If your broker uses another step, set it in Advanced: broker settings.
Should I risk a percentage or a fixed amount?
A percentage keeps your risk in line with your account: it shrinks after losses and grows with profits. Many traders risk 1% to 2% per trade, and the risk bar under the result is green up to 1%, amber up to 2% and red above that. A fixed amount suits a set budget per trade; add your balance too and the calculator still shows what share of the account it is.
How do gold and silver change the size?
This calculator counts a gold pip as 0.10 (XAU/USD, 100 ounces per lot, so 10 USD per pip per lot) and a silver pip as 0.01 (XAG/USD, 5,000 ounces per lot, so 50 USD per pip per lot). Brokers differ, so if yours uses another pip size or contract size, enter its values under Advanced: broker settings and the size is recalculated with them.
What does the calculator leave out?
Spread and commission are not included, so the real loss at the stop is slightly larger than the amount shown. A wide spread or a slippage past your stop adds to it as well.
Why record position size in your trading journal?
Logging the size, the stop and the planned risk for each trade shows whether you stick to your risk plan, and makes it easy to spot trades that were sized by feel instead of by the numbers.
