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Position Size Calculator

Calculate the optimal number of futures contracts based on your account size, risk tolerance, and stop loss distance.

Trade Parameters

Tick: 0.25 = $12.50Point: $50.00
$
%
1 tick = $12.50 for ES

Recommended Position Size

4

contracts

Risk LevelModerate
0%1%2%3%+

Risk Breakdown

Dollar Risk Budget$500.00
Risk Per Contract$125.00
Max Loss at Stop$500.00
Risk as % of Account1.00%
Unused Risk Budget--

FAQ

Frequently Asked Questions

The calculator divides your total dollar risk (account balance multiplied by risk percentage) by the dollar risk per contract (stop loss in ticks multiplied by tick value). The result is the maximum number of contracts you can trade while staying within your risk limit.

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Notices

The R | Protocol API™ software is Copyright © 2026 by Rithmic, LLC. All rights reserved.

Trading Platform by Rithmic™ is a trademark of Rithmic, LLC. All rights reserved.

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Performance Disclosure

Any backtested, simulated, or hypothetical results shown in Lune have significant limitations. They do not represent actual trading and may understate or overstate the impact of market conditions, liquidity, slippage, latency, operational failures, and other real-world factors.

No representation is made that any account will achieve profits or losses similar to any past, projected, or hypothetical results displayed. Past performance is not indicative of future results.

Quotes, market data, and account data may be delayed, incomplete, or inaccurate. You are responsible for independently verifying critical information (orders, fills, positions, balances, P&L, and margin) directly with your broker or prop firm before acting on it.

Risk Disclosure

Lune provides software tools for self-directed trading workflows. We are not a broker-dealer, exchange, investment adviser, or commodity trading advisor, and we do not execute discretionary trades on your behalf.

Trading involves substantial risk and can result in the loss of all capital. Backtested, simulated, or hypothetical results have material limitations and are not guarantees of future performance.

You are solely responsible for strategy selection, account permissions, risk limits, and monitoring live activity. Delays, outages, market volatility, third-party provider issues, and data inaccuracies can materially impact outcomes.

Nothing on this site is tax, legal, or investment advice, and references to instruments, strategies, or providers are not endorsements.