Free tool
Lot size calculator
Find the position size that risks exactly the amount you choose if your stop loss is hit.
Rounded down to the nearest 0.01 lot so you never risk more than planned.
Conversions use reference rates from 16 October 2026. Your broker’s live prices will differ slightly.
Why size from the stop loss
Choosing a lot size first and a stop second means your risk changes with every trade. Fix the money at risk first, then let the stop distance decide the size: wide stops get smaller positions and tight stops get larger ones. Every loss then costs the same share of your account. Read more in lot sizes explained and risk management.
Lot sizes at 1% risk: worked examples
EUR/USD in a US dollar account, risking 1% of the balance, rounded down to 0.01 lots.
| Balance | Risk (1%) | 15-pip stop | 30-pip stop | 60-pip stop |
|---|---|---|---|---|
| $1,000 | $10 | 0.06 lots | 0.03 lots | 0.01 lots |
| $2,500 | $25 | 0.16 lots | 0.08 lots | 0.04 lots |
| $5,000 | $50 | 0.33 lots | 0.16 lots | 0.08 lots |
| $10,000 | $100 | 0.66 lots | 0.33 lots | 0.16 lots |
Notice how the stop decides the size: doubling the stop halves the position, and the cash at risk stays the same.
Lot types and pip values
| Lot | Units | Size in lots | Pip value on EUR/USD |
|---|---|---|---|
| Standard | 100,000 | 1.00 | $10.00 |
| Mini | 10,000 | 0.10 | $1.00 |
| Micro | 1,000 | 0.01 | $0.10 |
Pip value is fixed only when the account currency is the pair’s quote currency. On USD/JPY at 158.02, a pip is worth about $6.33 per standard lot, and it moves with the rate. Gold uses a different contract size altogether, so use the gold lot size calculator for XAU/USD. If you’d rather type entry and stop prices than pips, the position size calculator measures the distance for you.
Using it with a signal
Take the distance between the signal’s entry and stop loss in pips, enter it above, and the calculator gives the size for your account. Our guide to reading a forex signal walks through a full example.
FAQ
What is the formula for lot size?
Lot size = (account balance × risk %) ÷ (stop loss in pips × pip value per standard lot). For example, $5,000 × 1% = $50 risk; with a 25-pip stop on EUR/USD at $10 per pip per lot, 50 ÷ 250 = 0.20 lots.
How much should I risk per trade?
Many traders risk between 0.5% and 2% of their account per trade. Lower risk means a losing streak does far less damage. See our risk management guide.
Why does the calculator round down?
Brokers accept sizes in steps of 0.01 lots. Rounding down keeps your loss at or below your chosen risk; rounding up would exceed it.
What is a standard, mini and micro lot?
A standard lot is 100,000 units of the base currency, a mini lot 10,000 (0.10 lots) and a micro lot 1,000 (0.01 lots). On EUR/USD in a USD account a pip is worth $10, $1 and $0.10 respectively.
What lot size should I use with a $100 account?
At 1% risk ($1) with a 20-pip stop on EUR/USD, the maths gives 0.005 lots, which is below the 0.01 minimum most brokers allow. The smallest standard trade would risk 2%. A cent account, or a wider risk budget per trade with fewer trades, are the usual answers.
Does lot size change between pairs?
Yes, because pip value does. A pip on EUR/USD is $10 per lot for a USD account, but on USD/JPY it depends on the exchange rate, and on crosses it depends on the quote currency. The calculator converts this for you when you pick the pair and your account currency.
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