PropSize: Lot Size Calculator

Position sizing for prop firms

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Position sizing for prop traders. Enter your balance, risk and stop loss to estimate a lot size. PropSize brings position sizing, configurable prop-firm loss-limit context and shareable trade cards together in one iPhone app. • Calculate forex, gold and supported index position sizes. • Use a stop distance in pips or enter entry and stop prices. • Type your own risk percentage or use quick adjustments. • Choose your firm and account type, with optional broker overrides. • Try a guided calculation before exploring subscription options. • Speak trade inputs using Apple's speech recognition, or type them. • Copy your lot size or share a trade card. Loss-limit context compares a single estimated trade risk with your configured initial account size and limit. PropSize does not connect to a trading account, track today's losses or open positions, or calculate remaining drawdown. Estimates exclude spread, fees and slippage. Currency conversions use reference rates, which may be cached. Broker contract and volume rules can vary; optional overrides are available. Subscriptions Choose a monthly or annual subscription. Eligible customers may receive the trial displayed at checkout. Apple determines eligibility. The price, trial and renewal terms are shown before confirmation. Subscriptions renew unless cancelled. Purchases and restores require an internet connection; some calculations can use cached rates. PropSize is a calculation tool, not financial advice. It does not guarantee a firm's rules are current or that a trade will avoid a breach. Privacy: https://propsize.app/privacy Terms: https://propsize.app/terms

Ratings & Reviews

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A clearer first calculation, smoother position sizing and more reliable checkout recovery. • Guided first-use tips point to the controls you need. • Standard sizing works without mandatory broker setup. • Custom risk entry, stop-price inputs and result-sheet spacing are improved. • Purchase and restore recovery is improved. • Optional app-usage sharing can be changed in Settings. • Speech permission wording now explains that Apple may process audio.

Version 1.1.2

The developer, JUSTICE UGHELIE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Purchases
    • Financial Info
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
JUSTICE UGHELIE
Size
39.7 MB
Category
Finance
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English
Age Rating
4+
In-App Purchases
Yes
  • PropSize Monthly $8.99
  • PropSize Annual $59.99
  • Learn More
Copyright
© 2026 Justice Ughelie
  • Developer Website
  • Privacy Policy

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