Pine Script Position Size Calculator

Calculates contract quantity from risk dollars, stop distance, and tick value so every trade risks the same fixed amount.

Copy//@version=6
strategy("Position Size by Risk", overlay=true, calc_on_every_tick=false)

// ── Inputs ──────────────────────────────────────────────
riskDollars = input.float(100.0, "Risk per Trade ($)", step=25, minval=1)
stopTicks   = input.int(30, "Stop Distance (ticks)", minval=1)
tickValue   = input.float(0.50, "Tick Value ($)", step=0.05, minval=0.01,
     tooltip="MNQ = $0.50, MES = $1.25, NQ = $5.00, ES = $12.50.")

// ── Risk-based quantity ──────────────────────────────────
qty = math.floor(riskDollars / (stopTicks * tickValue))
qty := math.max(qty, 1)

// ── Entry logic (replace with your own conditions) ───────
longCondition = ta.crossover(ta.ema(close, 9), ta.ema(close, 21))
if longCondition and strategy.position_size == 0
    strategy.entry("Long", strategy.long, qty=qty)
    strategy.exit("Long Exit", "Long", loss=stopTicks, profit=stopTicks * 2)

// ── Readout ──────────────────────────────────────────────
var table t = table.new(position.top_right, 1, 1)
if barstate.islast
    table.cell(t, 0, 0, "Qty: " + str.tostring(qty) + " contracts",
     bgcolor=color.new(color.blue, 80), text_color=color.white)

Settings

• riskDollars — fixed dollar risk per trade. Default $100.
• stopTicks — stop distance in ticks. Default 30.
• tickValue — dollar value of one tick. Default 0.50 (MNQ). MES = 1.25, ES = 12.50, NQ = 5.00.

How to use

• Paste into the Pine Editor and replace the EMA-crossover placeholder with your own entry conditions.
• Set tickValue for your contract — or pull it automatically with the tick value helper snippet.
• The math.max(qty, 1) guard prevents a zero-contract order when the stop is wide relative to risk.
• Cap the result with the max contract limit snippet so sizing never exceeds your firm’s scaling plan.

Frequently Asked Questions

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