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Forex Position Size Calculator

Estimate a Forex position with explicit quote-to-account currency conversion.

Educational estimates, not personalized investment advice. Verify broker specifications. Costs, slippage and changing exchange rates can increase actual loss. Example inputs are not live quotes.

Your estimate

See the numbers behind your plan.

Review the example inputs, adjust them to your scenario, then select Calculate.

  1. Check instrument specifications
  2. Enter your parameters
  3. Review the result and assumptions
Calculated in your browser. No account required.

How this calculator works

Forex position sizing translates a stop distance into a monetary loss per lot, then finds the number of lots that fits your selected budget. Currency conversion matters because a pair’s profit and loss is first expressed in its quote currency. This tool makes that conversion explicit.

A quick visual example

Illustrative inputs · not live prices
  1. Measure the stop1.1000 − 1.0950 = 0.0050
  2. Value one lot0.0050 × 100,000 = $500
  3. Apply the budget$100 ÷ $500 = 0.20 lot

Replaces the form inputs with this example and calculates the result.

Choose the right inputs

Enter the pair’s base and quote currencies, your account currency, entry, stop and direction. Check the broker’s contract size and pip size. Where conversion is needed, enter account-currency units for one unit of quote currency. A JPY quote often uses a different pip size from a four-decimal quote; verify the value rather than copying a setting from another pair.

Understand your result

Risk per lot combines the price distance, units per lot and conversion factor. Pip value helps express the same exposure per pip, while valid lots applies the broker’s size restrictions. When account currency matches the base currency, the model can use the reciprocal entry price as an estimate. A supplied conversion rate can override that fallback.

Common mistakes to avoid

A pip and a fractional pip are not interchangeable. Using 0.00001 instead of 0.0001 changes the reported pip value. Exchange rates at the stop may also differ from the entry-based conversion, so this is not a guarantee of final account-currency loss.

Frequently asked questions

Why do I need a conversion rate?

The pair’s quote currency may differ from your account currency. The rate translates the calculated loss into the currency of your budget.

Does leverage change the lot-size formula?

Leverage affects margin requirements. This sizing calculation uses the selected loss budget and stop distance; check margin separately.

Sources and further reading

CME Group: contract size, ticks and profit/loss explains contract-based price exposure using futures examples; those contract specifications are not substitutes for a Forex or CFD broker’s settings.

CFTC: retail Forex customer advisory explains leverage and dealer risks in a US regulatory context. Neither source endorses Curizora or validates a particular broker or prop-firm rule set.

Calculation formula

Risk per lot = |entry − stop| × base units per lot × quote-to-account rate. Pip value per lot = pip size × contract size × rate. Round lots down.

Worked example

EURUSD entry 1.1000, stop 1.0950 and 100,000 units per lot imply $500 risk per lot. A $100 budget allows 0.20 lot.

Assumptions and limitations

Conversion source is the pair quote currency. If account equals base, reciprocal entry price is used unless a rate is supplied. This is an entry-price estimate; stop-time rates can differ.

Read our calculation methodology · Explore trading guides

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