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Prop firm lot size calculator that respects what actually ends your account

Size contracts and lots for Apex, Topstep, Take Profit Trader, FTMO and every other prop desk. Always rounds down, and never past the firm's contract cap. Some firms have no daily limit at all — there, the trailing drawdown is the number that ends your account, and that is what it sizes against.

Calculate size now Trading journal → 2026 guide

Position size calculator

Live results update as you type. Formula: Contracts = $ Risk ÷ (Stop × Tick Value)

1 · Firm

2 · Account / product

Account Size / Equity ($)

Risk per Trade (%)

Daily Loss Limit ($)

Max Trades per Day

Remaining distance to breach ($)

Optional. For trailing accounts mid-run: current equity minus breach threshold. When set, all daily/trail caps use this number.

Instrument

Stop Loss (ticks)

$ Value per tick / contract

Reward : Risk ratio

Leverage (this symbol)

Instrument price (for margin cap)

Advanced: fixed $ risk + point value

Contracts = Dollar Risk ÷ (Stop Distance × Tick Value) · always floor

Recommended size

0 contracts

Loss buffer usage 0% of loss buffer

Trailing product? Open the drawdown simulator to see EOD vs intraday breach on the same week.

Risk budget (used) —

Actual $ risk —

% of account —

% of loss buffer —

Potential profit @ R:R —

Max size by loss buffer —

Full losers you can take today —

$ risk per 1 unit @ SL —

Margin estimate —

Markets: Apex & Topstep = futures only (no CFDs). FundedNext offers both Stellar CFDs and separate Futures (Flex / Legacy / Rapid). Shareable URL updates as you change inputs.

Instrument library

Click a row to load it. Futures (incl. GC/MGC, SI/SIL, CL/MCL) + CFD metals/crypto. $ values are defaults — edit for your broker.

Symbol	Name	Stop unit	Min incr.	Default $*	Category

*Default $ per stop-unit per 1 contract/lot. XAUUSD, XAGUSD, and crypto CFDs especially — always match your platform’s symbol specs.

Insider tip real talk · from the trader who built this

Psst… come closer.

I’m gonna tell you something the prop firms won’t put in the brochure.

Challenge accounts often run on juicier leverage than the funded account you actually want. A lot of traders size perfectly in the eval — then keep that same size after funding, under tighter margin and sometimes tighter rules… and blow the account. Don’t be that guy. I paid the tuition fee so you don’t have to.

Day you get the funded email: open this calculator again. Drop the leverage. Re-size. Then trade. Brotherhood rules.

Full brotherhood briefing → Tweak leverage field ↑

Why prop traders use PropSize

Daily-limit aware

Risk budget is the lower of % equity and ~25% of your daily loss limit — so one stop doesn’t end the account.

Always rounds down

Fractional contracts that push you over risk are floored. Oversize is how challenges die.

Micros when you need them

Trading NQ but size is too big? We show the MNQ equivalent so you can stay in the game.

Insider · read this

Prop firm lot size calculator that respects what actually ends your account

Position size calculator

Instrument library

Why prop traders use PropSize

Daily-limit aware

Always rounds down

Micros when you need them

The funded leverage trap

Position sizing for prop firms (2026)

Prop firm rules comparison

Futures tick values

Apex position sizing

Topstep position sizing

FundedNext CFDs + Futures