Lot Size Calculator

FX & CFD Lot Size Calculator | Free Margin, Stop-Loss Risk & Effective Leverage | SG Group

Free tool / Money management

FX & CFD Lot Size Calculator

Calculate FX & CFD position size, required margin and the estimated loss at your stop — for free. Enter your account balance, risk tolerance, entry price, stop price, leverage and contract size to see the recommended lot and money-management guideline for a single position.

Free version: single-position calculations Multi-position, correlation & combined-risk management coming in the paid version

01 — Calculator

FX & CFD Lot Size Calculator

This free calculator helps you check, before entering, “how large a lot keeps the loss at my stop within an acceptable range.” It shows not only the lot, but also the required margin, margin usage and effective leverage at the same time, so you can use it as a guide to avoid oversized positions.

A. Basic settings

B. Price & risk
%

The % and amount stay in sync both ways.

x
%

C. Contract specification

All figures shown are estimates based on your inputs. Spreads, fees, swaps, slippage, taxes and stop-out rules are not included. The status badges are general guidelines only and are not investment advice.

02 — Highlights

What this free tool calculates

Most lot calculators only derive the lot from your risk amount. This tool also shows the required margin, margin usage and effective leverage at the same time — and tells you which constraint is the limit: your risk budget or your margin.

Two constraints

Risk and margin together

It calculates the “risk-constrained lot” (from your acceptable loss) and the “margin-constrained lot” (from required margin) at once, and clearly marks which side is the limit.

Reverse

Lot-check mode

Enter any lot and it works backwards to show the estimated loss, risk %, required margin and effective leverage for that lot.

Multi-asset

FX and CFDs

Enter or preset the contract size and pip/point size to get an estimate for XAUUSD, index CFDs, crypto CFDs and more.

Visual

Safe / Caution / High risk

Risk %, margin usage and effective leverage are shown with calm-coloured badges and in text, so the state never depends on colour alone.

Convenience

Save, share, copy

Your last inputs are stored on your device and restored next time. You can copy the result as text and share the input state by URL (no personal data included).

For every desk

Switch 1-lot units

For FX you can choose 1 lot = 1,000 / 10,000 / 100,000 units. You can also set a free-margin buffer to keep, making oversized lots easier to avoid.

03 — Inputs and results

Inputs

Enter your balance, risk tolerance, entry price, stop price (or the stop distance in pips/points), leverage, free-margin buffer, conversion rate, contract size, pip/point size, minimum lot and lot step. Choosing a symbol preset fills in typical defaults for contract size, pip size and leverage (all editable).

Results

The recommended lot, estimated loss, risk %, required margin and effective leverage are shown prominently, with details such as the risk-constrained lot, margin-constrained lot, the binding constraint, pip/point value and the maximum theoretical lot.

Formulas

Everything is calculated in your browser (client-side); your inputs are never sent anywhere. The main formulas are:

Risk amountriskAmount = balance × riskPercent ÷ 100
Loss per 1 lotlossPerLot = |entry − stop| × contractSize × conversionRate
Lot by risk constraintlotByRisk = floorToStep(riskAmount ÷ lossPerLot, lotStep)
Margin per 1 lotmarginPerLot = (entry × contractSize × conversionRate) ÷ leverage
Max lot by margin constraintusableMargin = balance × (1 − marginBufferPercent ÷ 100)　/　lotByMargin = floorToStep(usableMargin ÷ marginPerLot, lotStep)
Recommended lotrecommendedLot = min(lotByRisk, lotByMargin) (0 if below minimum lot)
Effective leverageeffectiveLeverage = recommendedLot × (entry × contractSize × conversionRate) ÷ balance
pip / point valuepipValuePerLot = pipSize × contractSize × conversionRate

About the paid version

Combined multi-position risk management is in the paid version

Deeper management — concurrent positions, averaging down, correlation, per-symbol leverage, portfolio-wide maximum loss, changes in margin level and fast-market scenarios — is planned for the paid version.

Get information about the paid version

04 — FAQ

Frequently asked questions

Is this lot size calculator free?
Yes. Single-position lot sizing, required margin, estimated stop-loss loss and effective leverage are all free to use.
Can I use it for CFDs as well as FX?
Yes. By entering the contract size, point size and conversion rate you can use it for an estimate on gold, stock indices, crypto CFDs and more. Always confirm the exact specification with your broker.
Can it calculate the combined risk of multiple positions?
The free version is for a single position only. Advanced management including multiple positions, correlation, margin level and averaging-down is planned for the paid version.
Is it safe to trade exactly as the result suggests?
No. This tool produces an estimate based on your inputs and does not guarantee any trading decision or profit. Spreads, fees, swaps, slippage, fills during fast markets and stop-out rules are not taken into account.
Can I enter any leverage I like?
Yes, but the leverage and required margin actually available depend on your country, account type, broker and instrument. Always check the terms of the broker you use.

05 — On managing multiple positions

About multi-position risk management

The free version focuses on single-position calculations. In real trading, when you hold several positions at once, you need to account for correlation across currencies, indices and commodities, same-direction risk and changes in your margin level. These advanced management features are planned for the paid version.

Planned for the paid version

Combined multi-position risk management is in the paid version

Deeper management — concurrent positions, averaging down, correlation, per-symbol leverage, portfolio-wide maximum loss, changes in margin level and fast-market scenarios — is planned for the paid version.

  • Combined risk across multiple positions
  • Concentration detection (same currency / same index)
  • Correlation risk
  • Average price & total risk when averaging down / pyramiding
  • Per-symbol / per-broker contract specifications
  • Scenario analysis of the margin level
  • Stress tests including gaps, fast markets & slippage
  • TradingView / CSV / trade-history integration
  • Money-management templates for corporate & prop accounts
Get information about the paid version

06 — Disclaimer

Disclaimer

Please read before using

  • This page is provided for information and calculation assistance only.
  • It is not intended as investment advice, a trading recommendation or a solicitation.
  • Results are estimates based on your inputs and their accuracy and completeness are not guaranteed.
  • Spreads, fees, swaps, slippage, taxes, rejected fills, price jumps during fast markets and stop-out rules are not taken into account.
  • For actual trading conditions, please check each broker’s pre-contract documents, trading explanation and latest margin rates.
  • Leverage, required margin and minimum trade units differ by country, account type, broker and instrument.
  • Trade at your own risk. We accept no liability for any loss arising from use of this tool.
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© 2026 SG Group · FX & CFD Lot Size Calculator — Estimation tool. Not investment advice.