Fixed Ratio Sizing Formula (Ryan Jones): The Delta Sizing Model
Fixed Ratio sizing, created by Ryan Jones, scales contracts based on accumulated profit using a parameter called "Delta": Required Profit = Current Contracts x Delta. If Delta is $2,000, moving from 1 to 2 contracts requires $2,000 profit. Moving from 2 to 3 contracts requires $4,000 more ($2,000 x 2). Total profit to trade N contracts = Delta x (N x (N - 1) / 2).
Fixed Fractional sizing causes small accounts to grow too slowly and large accounts to grow too aggressively. Fixed Ratio provides a balanced, mathematically stabilized growth curve that smooths contract expansion across all capital levels.
INTERACTIVE POSITION SIZING & RISK SIMULATOR
2026 BENCHMARK & COMPARISON DATA MATRIX
| Target Contracts / Lots | Added Profit Needed (Delta=$2,000) | Cumulative Profit Milestone | Account Balance ($10k Start) | Risk Exposure Profile |
|---|---|---|---|---|
| 1 Contract / Lot | $0 (Starting) | $0 Milestone | $10,000 Balance | Standard baseline risk |
| 2 Contracts / Lots | +$2,000 Profit | $2,000 Cumulative | $12,000 Balance | Conservative expansion |
| 3 Contracts / Lots | +$4,000 Profit | $6,000 Cumulative | $16,000 Balance | Smooth scaling |
| 4 Contracts / Lots | +$6,000 Profit | $12,000 Cumulative | $22,000 Balance | Controlled acceleration |
| 5 Contracts / Lots | +$8,000 Profit | $20,000 Cumulative | $30,000 Balance | Institutional compounding |
Calibrating the Optimal Delta Parameter
Delta should be calibrated to at least half of your strategy maximum historical drawdown. If your maximum historical drawdown was $4,000, setting Delta at $2,000 to $2,500 prevents contract increases from triggering during equity pullbacks.
Model Dynamic Account Growth & Delta
Engineered for zero-math error execution. Tested across MT4/MT5 and Binance futures.
FREQUENTLY ASKED QUESTIONS & EXPERT CLARIFICATIONS
What happens in Fixed Ratio when an account enters a drawdown?
You decrease contract size according to the exact same Delta formula in reverse, protecting profits as equity drops below prior milestones.
Author: TradeCoreHub Quantitative Risk & Algorithmic Desk. Peer-reviewed against CME tick specifications, FTMO/FundedNext drawdown contracts, and Binance USD-M liquidation mechanics.
Audit Standard: Zero-Math-Error validation. Formulas are calibrated to ensure absolute capital survivability across statistical losing streaks.
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