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Forex & Prop-Firm Lot Size Calculator

Never risk more than planned. Calculate exact position sizing across Forex pairs, Gold (XAUUSD), and US30, and instantly get a pre-formatted TradeLynk alert JSON snippet ready for TradingView and MT5.

100% Free Forever FTMO & FundedNext Preset Support 100oz Gold Contract Math One-Click JSON Webhook Output
Position Size Calculator

Exact Contract & Lot Sizing Calculator

Calculates exact lot sizes and auto-generates a ready-to-paste TradeLynk webhook payload.

$
|
Risk Percentage:1% ($1,000)
0.25% (Conservative)1.0% (Prop-Firm Standard)2.0%+ (Aggressive)
$10/pip per standard lot
Recommended Position Size
4.00 Lots
Risk: $1,000
•
Reward (1:2): $2,000
TradeLynk Webhook JSON
{
  "token": "YOUR_TRADELYNK_WEBHOOK_TOKEN",
  "action": "BUY",
  "symbol": "EURUSD",
  "lots": 4,
  "sl_pips": 25,
  "tp_pips": 50,
  "comment": "Risk_1pct"
}
Paste this JSON message into your TradingView alert dialog to automate execution on MetaTrader 5 in sub-300ms.
Automate This Sizing in TradingView
Contract Specifications

How Lot Size Math Works Across Asset Classes

Different instruments have vastly different contract specifications. Here is how MetaTrader 5 and TradeLynk calculate risk:

Instrument ClassStandard Lot SizeTick / Point ValueLot Sizing Formula
Forex Majors (EURUSD, GBPUSD)100,000 Units$10.00 per pip (per 1.0 Lot)Risk $ / (SL Pips × $10)
Gold (XAUUSD)100 Troy Ounces$100.00 per $1.00 move (per 1.0 Lot)Risk $ / (SL Price Distance × $100)
US Indices (US30, NAS100)1 Contract CFD$1.00 per 1 Index PointRisk $ / (SL Points × $1)
Bitcoin (BTCUSD)1 BTC$1.00 per $1.00 price moveRisk $ / (SL Dollar Distance × $1)
Risk Management Masterclass

Why Static Lot Sizing Causes 85% of Prop-Firm Challenge Failures

Many algorithmic traders make the mistake of hardcoding a fixed lot size (e.g. 1.00 lot) into their Pine Script strategy alerts. However, market volatility changes constantly: a 15-pip stop loss during the Asian session carries much less dollar risk than a 45-pip stop loss during the London/New York overlap.

With TradeLynk, you can either generate the exact static lot size with this calculator or simply pass risk_percent: 1.0 in your TradingView webhook. TradeLynk dynamically computes the required lot size on every execution, protecting your prop firm evaluation from over-leverage.

Calculator FAQs

Frequently Asked Questions

Answers regarding position sizing, margin requirements, and TradeLynk automation.

Gold CFDs on MetaTrader 5 are typically quoted on a 100 troy ounce contract specification. This means a $1.00 move in the price of Gold corresponds to exactly $100 profit or loss on a standard 1.00 lot ($1.00 per 0.01 micro lot). Our calculator incorporates this contract math precisely to prevent over-leveraging on precious metals.

Automate Your Position Sizing in Real-Time

Stop manually calculating lots before every trade. Connect TradingView to MT5 with TradeLynk and let our cloud bridge size every execution automatically.

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