Futures Contract Sizing Calculator: How Many Contracts for Your Drawdown?
Enter the most you’re willing to lose on one trade, your stop size in points, and your instrument. The calculator returns the largest contract count that keeps the trade inside your budget — rounded down, always.
The formula, in easy-to-understand terms
Contracts = your risk budget ÷ (stop in points × dollars per point), rounded down to the nearest whole contract. One contract loses (stop × point value) dollars when your stop is hit, so the contract count is simply how many of those losses fit inside the budget. We always round down: rounding up would put the trade over the risk you chose. Futures are traded in whole contracts — there is no half a contract.
Three worked examples
Example 1 — MES, $500 budget, 5-point stop. MES is $5 per point, so one contract risks 5 × $5 = $25. $500 ÷ $25 = 20 contracts, risking exactly $500. One more contract (21) would risk $525 — over budget.
Example 2 — MNQ, $200 budget, 4-point stop. MNQ is $10 per point, so one contract risks 4 × $10 = $40. $200 ÷ $40 = 5 contracts, risking exactly $200. One more (6) would risk $240.
Example 3 — ES, $1,000 budget, 2.5-point stop. ES is $50 per point, so one contract risks 2.5 × $50 = $125. $1,000 ÷ $125 = 8 contracts, risking exactly $1,000. One more (9) would risk $1,125.
Questions traders ask
Why round down instead of to the nearest contract?
Because the budget is a maximum, not a target. Rounding to nearest would sometimes size you above the loss you decided you can take — on a prop firm account, that can be the difference between surviving a drawdown and breaching it.
What if one contract already risks more than my budget?
The calculator returns 0 contracts. Your options are a wider risk budget, a tighter stop, or a smaller instrument — that’s exactly what the micros (MES, MNQ, MGC, MCL) exist for: the same markets at a tenth of the dollars per point.
Does this include commissions, fees or slippage?
No. The calculation covers the stop distance only. Real losses can be slightly larger once fees and slippage are counted, and a stop can fill worse than its price in a fast market — size with a little room to spare.
What risk budget should I use on a prop firm account?
Your budget should be a small slice of the drawdown your account allows, never the whole drawdown — one trade should never be able to end the account. Your firm’s drawdown for each account size is listed on its page in the lineup.
Every firm in the lineup
Keep comparing: Best futures prop firms · Futures prop firm discount codes · Cheapest futures prop firms · How we verify