Prop Firm Risk Calculator – Position Size and Loss Limits

Prop Firm Risk Calculator

A small on-chart panel that helps you plan risk on funded / prop firm accounts. It is a calculator only: it gives no signals and places no orders.

What it shows:

Risk per trade in account currency.

Stop distance in price units.

Position size in lots for that stop.

Daily loss limit and max total loss limit.

How many losing trades at the chosen risk fit inside each limit.

Value of 1 price unit for 1 lot, read from the symbol specification.

How it works:

Risk amount = account size x risk percent.

Lots = risk amount / (stop distance x value of 1 price unit per lot), rounded down to the symbol volume step and kept between the minimum and maximum lot.

The stop distance is either a fixed value in price units or ATR x multiplier (ATR of the last closed bar).

Inputs:

Account size source: fixed value or current account balance.

Account size, risk per trade (%), daily loss limit (%), max total loss limit (%).

Stop distance mode: manual (price units) or ATR based.

Manual stop distance, ATR period, ATR multiplier.

Panel corner, font size, text color.

Notes:

Results do not include spread, commission or slippage.

The loss limits are values you set to match your own prop firm rules. Always check them against the rules of your firm.

Works on any symbol. The panel updates with every tick.