Level 3 · Lesson 2 / 4 · English
Position sizing, pip value and volume steps
4 min reading · Exercises take additional time
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Position size links the adverse price distance to a money budget. The calculation only makes sense when the contract size, pip convention and currency conversion are explicit. Work from a loss scenario and then check the provider’s permitted volume, rather than using the largest amount the account can open.
What you will learn
- Explain position sizing, pip value and volume steps.
- Work through the stated hypothetical example with explicit units.
- Recognise limitations and apply a documented practice check.
Calculate loss per lot first
For conventional EUR/USD, a standard lot represents 100,000 EUR and a pip is 0.0001 USD per EUR. One pip on one lot is therefore USD 10. A 25-pip adverse movement on one lot is USD 250 before costs. With USD 50 available for that movement, simplified size is 50 divided by 250, or 0.20 lots.
If the budget includes USD 10 of assumed fixed costs, use the remaining USD 40 for the movement, producing 0.16 lots at the same distance. Real costs can vary with volume, requiring the full loss expression to be solved rather than subtracting an arbitrary flat amount. Use the account’s actual contract specification.
Conversion and rounding are part of sizing
Pip result is naturally in quote currency. A USD/JPY calculation produces JPY and needs an explicit JPY-to-account-currency conversion when the account is denominated elsewhere. Do not assume a remembered exchange rate is current. If conversion is unavailable, report the quote-currency amount or stop the account-currency estimate.
After calculating volume, round down to the permitted step and recompute the adverse result. A hypothetical step of 0.01 lots permits 0.16, but another contract may not. If the minimum permitted size exceeds the budget, do not silently round upward. Conventional Forex formulas cannot be reused for Gold or index CFDs without their contract specifications.
Key terms
- Pip value
- Money result of one conventional pip at a specified volume.
- Volume step
- Permitted increment in an order’s volume.
- Quote currency
- Currency in which the raw price-movement result is expressed.
Hypothetical worked example · Not live market prices
EUR/USD sizing before costs
- Assume a conventional EUR/USD contract and USD 50 price-movement allowance.
- At 25 pips and USD 10 per pip per lot, one lot risks USD 250 before costs.
- 50 ÷ 250 = 0.20 lots; verify actual costs, steps and gap risk separately.
| Quantity | Calculation | Result |
|---|---|---|
| One-lot adverse move | 25 × USD 10 | USD 250 |
| Volume | 50 ÷ 250 | 0.20 lots |
| Base units | 0.20 × 100,000 | 20,000 EUR |
Simplified educational calculations. Costs, slippage and provider-specific adjustments apply where relevant; these are not actual returns.
Common mistakes to avoid
- Reversing units in a conversion; write quote currency per base currency.
- Rounding volume upward to fit a step; recompute and respect the budget.
- Using Forex lot assumptions for a CFD; obtain its contract specification.
Lesson summary
Divide the usable movement budget by adverse movement per unit or lot, convert currencies explicitly, then check permitted volume and total costs.
Practical exercise
For the same hypothetical conventional EUR/USD contract, use USD 30 movement allowance and 20 pips. One lot’s adverse result is USD 200, giving 0.15 lots before costs. Record the assumptions rather than calling this a personalised trade size.
Knowledge check
Check your understanding
Results apply to this attempt only and are not saved to a student account. No certificate is issued.
Answer all questions correctly and complete the exercise. Progress follows you between Academy pages for this visit only; it is not saved to an account and resets on reload.
Related lessons
Financial education, not personal investment advice. Leveraged Forex and CFDs can lead to substantial losses. Demo practice and correct quiz answers do not guarantee trading success.