A forex lot is a quantity of a broker's contract. It is not an amount of money you deposit, a fixed risk percentage or a promise about how much a trade can lose. Two orders labelled 0.10 lots can have different cash risk when their symbols, entry-to-stop distances or contract sizes differ.
The examples below assume a EURUSD contract with 100,000 euros per lot, a pip of 0.0001 and a US-dollar account. These are explicitly hypothetical specifications, not a current quote or a universal rule for every broker. Begin with your own symbol's Specification in MT5 rather than treating a familiar lot label as sufficient information.
Convert volume into base-currency units
For the assumed contract, currency units = lots × 100,000. Buying EURUSD means taking exposure to euros relative to dollars; selling reverses that direction. The order's notional value is distinct from the margin reserved to support it.
At a fictional EURUSD price of 1.1000, a 0.10-lot position represents 10,000 euros, equivalent to $11,000 at that conversion rate. It does not mean that $11,000 must always be deposited: margin depends on the account and instrument rules. Nor does a smaller margin figure limit the position's potential loss.
| Volume | Euro exposure | USD value of one pip |
|---|---|---|
| 0.01 lot | 1,000 EUR | $0.10 |
| 0.10 lot | 10,000 EUR | $1.00 |
| 1.00 lot | 100,000 EUR | $10.00 |
Calculate pip value, then a planned loss
For this USD-quoted pair and USD account, pip value = currency units × 0.0001. A 0.10-lot buy filled at 1.1000 with a planned exit at 1.0975 has a 0.0025 distance, or 25 pips. Its price-distance loss would be 10,000 × 0.0025 = $25 before separately charged commission, financing and any difference in the eventual exit fill.
If the exit fills at 1.0970 instead, the distance is 30 pips and the same position loses $30 before charges. The stop price describes an intended exit instruction. It does not turn the $25 estimate into a guaranteed maximum, particularly through gaps or fast-moving conditions.
Work backward from a hypothetical budget
Suppose a trader's written exercise allows $40 of price-distance loss across a 30-pip stop. One lot would lose $300, so raw volume = 40 ÷ 300 = 0.133333 lots. If this broker permits 0.01-lot increments, rounding down to 0.13 gives $39 of estimated price-distance loss; rounding up to 0.14 gives $42. Neither figure includes costs.
This is arithmetic, not a recommended budget. If the minimum order is too large for the exercise, the calculation does not justify moving the stop closer, increasing leverage or choosing a larger loss allowance. A different instrument or no trade may be the appropriate result of the review.
Account currency and pip conventions can change the answer
The $10-per-pip figure above is not universal. A USDJPY contract may use a 0.01 pip, and the initial price-distance result is in yen. For an assumed 100,000-dollar contract, one pip on one lot is 1,000 yen. At a hypothetical conversion rate of 150 yen per dollar, that is approximately $6.67; a changing conversion rate changes the dollar figure.
An account denominated in euros introduces another conversion. Platform points can also differ from pips on five-decimal forex quotes. Write down actual entry and exit prices, contract size, tick size and profit currency, and use the platform's account-currency profit estimate to check your hand calculation.
A sizing checklist that includes existing exposure
- Read minimum volume, maximum volume, volume step, contract size and permitted trading direction for the exact broker symbol.
- Verify whether the stop and target are on the intended sides of the entry; an absolute-distance calculation cannot check the trade idea.
- Include commission, spread already reflected in actual fills, financing and a separate execution allowance without counting spread twice.
- Count other positions sharing the same currency exposure, and estimate an EA's maximum basket rather than only its first order.
- Check margin independently. A volume that fits one planned stop-loss calculation can still exceed the account's available collateral.
Use the calculator without overlooking its assumptions
Quantora's Position Size Calculator can reproduce the linear EURUSD exercise by entering the matching USD sizing base, prices and 100,000-unit contract. Its display rounds lots and does not validate the broker's volume step, stop direction, currency conversion or margin. Cross-check the unrounded result and the final proposed order in your platform.
Common questions
- Is 0.01 lot always low risk? No. Risk also depends on distance, contract, costs, holding time and other exposure. A small initial grid order may become a much larger basket.
- Does increasing leverage change pip value at the same volume? It does not change this position's price-distance result; it changes collateral requirements under the applicable margin rules.
- Can I copy another account's lots? Their balance, currency, contract and existing positions may differ. Reconstruct the assumptions instead of copying the number alone.