Position Calculator

Account

$
%

Trade

$
$
x
i
The number of units per lot for your instrument. In MT5: right-click the symbol in Market Watch → Specification → find "Contract size". E.g. BTC = 1, Gold = 100 oz, EUR/USD = 100,000.
Entry and stop cannot be equal.

Result

Volume capped by margin — actual risk is less than target.
Volume (lots)
—
Enter this into MT5
Amount at risk
—
— of account
Position value
—
— effective leverage
Margin required
—
— of account
Risk exposure0%
Feedback or bug report ↗

Frequently Asked Questions

What is a position size calculator?

A fast, no-fuss tool built for traders at every stage of the journey. Enter your account size, risk %, entry, and stop loss — it instantly tells you exactly how many lots or contracts to trade. That's it.

The core idea: your risk is always a fixed dollar amount based on where your stop loss is, not a guess. Whether you're just starting out with a prop firm challenge or already trading live, this keeps you from over-risking on any single trade — so one bad day doesn't undo weeks of work.

How do I calculate lot size for MT4 or MT5?

The formula behind it: Lots = (Account × Risk%) ÷ (|Entry − Stop| × Contract Size)

Fill in your account size, risk %, entry, stop, leverage, and contract size — the result is capped by your margin so you never get a number MT4/MT5 will reject. Copy it straight into your order ticket.

How do I find the contract size for my MT5 instrument?

In MT5: right-click the symbol → Specification → look for "Contract size". Common values: EUR/USD = 100,000 units, Gold (XAUUSD) = 100 oz, BTC = 1, Oil (USOIL) = 1,000 barrels. Paste that number into the calculator and you're good.

How does the Tradovate and NinjaTrader calculator work?

Select your instrument (MES, MNQ, MBT, MGC, etc.) — the $ per point fills in automatically from CME specs. The formula: Contracts = floor(Risk Amount ÷ (|Entry − Stop| × $ per Point))

Result is always rounded down since you can't trade half a futures contract. If it shows 0, your stop is too wide for your current risk budget.

What risk percentage should I use per trade?

Most prop firm rules cap you at 1–2% per trade. At 2%, you'd need 50 straight losing trades to wipe out — that's the kind of buffer that keeps you in the game. Starting out? Stay at 0.5–1% until your edge is proven. The goal is survival first, profits follow.

Why does the calculator show "less than 1 contract"?

Your risk budget isn't big enough to cover even one contract at that stop distance. Fix it by tightening your stop, bumping up your risk %, or increasing your account size. If none of those work — sit this trade out.

Does this calculator send my financial data anywhere?

No. Everything runs in your browser — no server, no tracking, no data collection. Your inputs are saved to localStorage so the tool remembers them next time, but they never leave your device.

Is this position size calculator free?

Yes — free, no sign-up, no ads. Just open it and use it. Works on desktop and mobile, and keeps working offline after the first load.