PropSize: Lot Size Calculator

PropSize is a subscription app. Full access requires a monthly ($8.99/mo) or annual ($59.99/yr) subscription after a free trial period.

PropSize is the only position size calculator built specifically for prop traders.

Position sizing for prop firms is different to retail trading. Your risk ceiling is not your account balance — it is your daily loss limit. One wrong lot size can end a funded account in a single session. PropSize bakes your firm's daily loss limit and max drawdown into every calculation so you can never accidentally breach the rules.

Prop-firm-aware calculations
Whether you are on FTMO, FundedNext, FundingPips, or any other prop firm, PropSize loads your firm's exact rules automatically. No manual limit entry. Calculate lot size for FTMO challenges, funded accounts, and live accounts — all from one app.

Gold, indices, and forex — all covered
Calculate position sizes for all major forex pairs, gold (XAUUSD), silver (XAGUSD), US30, NASDAQ, and oil. For gold and indices, XAUUSD contract size varies by broker and is the most common source of calculation errors for prop traders. PropSize includes a step-by-step MT5 contract size lookup that guides you to the exact value in your platform — then calculates your lot size accurately.

Daily loss limit warnings
PropSize monitors your daily loss limit in real time. An amber warning appears when your position approaches 80% of your firm's drawdown limit — giving you time to reduce size before it becomes a violation.

Say your trade out loud — instrument, entry, stop loss, risk — and PropSize fills in the fields automatically. No typing, no switching apps.

Shareable trade cards
Every calculation generates a branded trade card showing your position, risk percentage, lot size, and firm. Share directly to X or TikTok in one tap.

Works fully offline
No live price feeds required. PropSize opens ready to calculate with no loading, no spinners, and no internet dependency.

Frequently Asked Questions

How do I calculate lot size for FTMO?
Enter your FTMO account balance, select your risk percentage, choose your instrument, and enter your stop loss. PropSize automatically applies FTMO's 5% daily loss limit and calculates the correct lot size. No manual limit entry needed.

How many lots can I trade on a prop firm challenge?
It depends on your account size, risk per trade, and stop loss distance. PropSize calculates this instantly and warns you when your position approaches your firm's daily loss limit — before you place the trade.

How do I calculate position size for gold (XAUUSD) on MT5?
Gold requires a specific contract size that varies by broker. PropSize includes a step-by-step MT5 contract size lookup for XAUUSD that guides you to the exact value in your platform, then calculates your lot size accurately.

How do I avoid blowing a prop challenge on position sizing?
The most common mistake is not accounting for your firm's daily loss limit when sizing positions. PropSize bakes your firm's rules into every calculation so you cannot accidentally oversize a trade and breach your daily drawdown limit.

How do I pass the FTMO challenge?
Consistency and disciplined risk management are the two biggest factors. PropSize ensures every trade is sized correctly within your daily loss limit — eliminating the most common reason traders fail FTMO challenges.

Does this work for FundedNext and FundingPips?
Yes. PropSize supports FTMO, FundedNext, and FundingPips with pre-loaded firm rules. Each firm's daily loss limit and max drawdown are built in — no manual entry required.

How do I calculate lot size for indices like US30 and NASDAQ on a funded account?
Indices use a different contract size to forex pairs. PropSize walks you through finding your broker's exact contract size in MT5, then calculates the correct lot size based on your risk percentage and stop loss distance.

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