OPEN-SOURCE SCRIPT

Stock Position Sizer with Daily ATR

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The script is a stock position-sizing indicator based on ATR multiples. It calculates how many whole shares you can trade while risking a chosen percentage of your nominal equity.

With the defaults:

- Nominal equity: 90,000
- Risk: 0.5%
- Risk budget: 450
- ATR length: 20 days
- Stop distance: 2 × ATR

### Calculation

It retrieves the close and ATR from the last completed daily bar, regardless of the chart timeframe.

Risk budget = Nominal equity × Risk percentage
Stop distance = Daily ATR × ATR multiple
Shares = floor(Risk budget ÷ Stop distance)

For example, if ATR is 8.86:


Risk budget = 90,000 × 0.5% = 450
Stop distance = 8.86 × 2 = 17.72
Position size = floor(450 ÷ 17.72) = 25 shares

Long and short levels

Both directions use the same share quantity because their stop distances are symmetrical:

Long entry = Previous daily close
Long stop = Previous daily close − 2 ATR

Short entry = Previous daily close
Short stop = Previous daily close + 2 ATR

What it displays

The chart shows three horizontal levels:

- Blue: previous daily close and assumed entry
- Red: long stop
- Orange: short stop

The table shows:

- Stock currency
- Previous daily close
- Daily ATR
- Stop distance
- Risk budget
- Number of whole shares
- Long entry and stop
- Short entry and stop
- Position notional and actual risk after rounding

There is no currency conversion. A value of `90,000` means $90,000 on a USD stock, €90,000 on a EUR stock, and so forth.

免責事項

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