Prop firm tool

FLR / per-trade risk calculator

The FLR caps how much you can lose on a single trade — measured as a percentage of your balance right before that trade, not your starting balance. Size a position so you never cross it, or check a trade before you click.

How the calculation works

Formula: max lots = (balance × cap %) ÷ (stop-loss distance × value per 1.00 lot), rounded down to the 0.01-lot step so the result can never cross the cap.

Units: balance and value per lot in US dollars; stop-loss distance in the instrument’s own units — dollars of price move for XAUUSD, index points for US30 and NAS100.

Example: a $100,000 balance with a 2% cap allows a $2,000 loss on one trade. A $3 stop on gold at $100 per lot risks $300 per lot. 2,000 ÷ 300 = 6.666…, rounded down to 6.66 lots — $1,998 of risk. 6.67 lots would risk $2,001 and break the cap.

Size your trade

Account balance?Your balance right before this trade — the FLR cap is a % of this, not the starting balance.

FLR per-trade cap?The most you may lose on one trade, as a % of current balance. Cross it and the account can be breached.

2.0%= $2,000

0.5%5%

Instrument?What you’re trading. Sets the contract value below.

Stop-loss distance?Distance from entry to your stop-loss, in the instrument’s native units.= $500 / lots

$ move

Value per 1.00 lot?Cash P&L from a one-unit move on a 1.00 lot. Pre-filled to typical MT5 specs — adjust to match your broker.

Max position size

4.00lots

Risking $2,000 of your $2,000 cap

Rounded down to the 0.01-lot step, so this size can never cross the cap.

Risk breakdown

Max loss per trade	$2,000
Risk per 1.00 lot	$500
Stop-loss distance	5 $ move
Max position size	4.00 lots
Risk at this size	$2,000

Rules and contract specs change — always verify on your firm and broker before trading. Educational use only, not financial advice.

Plans with no per-trade cap. In our data these plans don’t cap single-trade loss. The rule is set per plan, so the same firm can also have capped plans in the list above:

Alpha Capital · Alpha SwingFTMO · 1-StepFTMO · 2-Step StandardFTMO · InstantFunding Pips · 2 Step FlexFunding Pips · 2 Step ProFunding Pips · 2 Step StandardInvest Prop · SpeedLucid Trading · LucidDaily (EOD)Lucid Trading · LucidDaily (Intraday)Lucid Trading · LucidDirectLucid Trading · LucidFlexLucid Trading · LucidProPropiaFunds · 3-Step MasterPropiaFunds · MasterPropiaFunds · PhoenixThe5ers · BootcampThe5ers · High StakesThe5ers · Hyper GrowthVolt Funded · 1V One-PhaseVolt Funded · 2V Two-PhaseZoraFX · LastProp

FAQ

FLR rule — questions

What is the FLR / per-trade risk cap?

It’s a hard limit on how much you can lose on any single trade, written as a percentage of your account balance just before that trade. If a firm sets a 2% FLR and your balance is $100,000, no one trade may lose more than $2,000. Go past it and the account can be breached even if your overall drawdown is fine.

How do I size a trade to stay under it?

Take your max loss (balance × FLR%), then divide by the cash risk of a 1.00 lot at your stop distance. Max lots = max loss ÷ (stop distance × value per lot). The sizer tab does exactly this — punch in balance, cap, instrument and stop, and it returns the largest position that still respects the cap.

Is the cap based on starting balance or current balance?

On this tool, current balance — the balance right before the trade. Most firms that run a per-trade cap recalculate it against your live balance, so as your account grows the dollar cap grows with it, and as it shrinks the cap tightens. Always confirm which balance your firm uses.

Why does the contract value matter so much?

Because it converts your stop distance into dollars. The same 50-point stop is a very different dollar risk on US30 versus NAS100 versus gold. The value-per-lot field is pre-filled to typical MT5 CFD specs, but brokers differ — set it to your platform’s real number and the lot result will be exact.

What happens if a single trade breaches the FLR?

Most firms void the trade or fail the account outright, regardless of whether you were green overall. There’s no averaging it out across other trades — the cap is per-trade. The checker tab flags this before you take the trade: anything over 100% of the cap shows as a breach.

Related tools

What Is the Floating Loss Rule (FLR) in Prop Trading?Learn how prop firm floating loss rules work, compare live-loss and stop-risk formulas, and calculate safer position sizes before trading.

Size your trade

Account balance?Your balance right before this trade — the FLR cap is a % of this, not the starting balance.

FLR per-trade cap?The most you may lose on one trade, as a % of current balance. Cross it and the account can be breached.

2.0%= $2,000

0.5%5%

Instrument?What you’re trading. Sets the contract value below.

Stop-loss distance?Distance from entry to your stop-loss, in the instrument’s native units.= $500 / lots

$ move

Value per 1.00 lot?Cash P&L from a one-unit move on a 1.00 lot. Pre-filled to typical MT5 specs — adjust to match your broker.

FLR rule — questions

What is the FLR / per-trade risk cap?

How do I size a trade to stay under it?

Is the cap based on starting balance or current balance?

Why does the contract value matter so much?

What happens if a single trade breaches the FLR?

FLR / per-trade risk calculator

How the calculation works

Size your trade

Risk breakdown

FLR rule — questions

Further reading

Size your trade

Risk breakdown

FLR rule — questions