Answer
Does Sierra Chart have a position size calculator?
Last updated 10 September 2026
No, not a position size calculator. Sierra Chart has a Reward/Risk drawing tool, but it works the other way round: you give it a quantity and it tells you what that quantity risks. Going from a risk budget to a contract count, which is the calculation you need before the trade, is the part it does not do.
What Sierra Chart does have
The Reward/Risk drawing tool, under Chart >> Drawing Tools. You place it on the chart, set an entry, a stop and a target, and it measures the trade: the distance to each level and the reward-to-risk ratio between them. Since version 2947 it can also plot targets at R multiples, which users had been asking for since 2021.
It is a good measuring tool. But every number it gives you assumes a quantity you have already decided somewhere else. It never tells you what that quantity should be.
Why measuring is not sizing
The two calculations run in opposite directions.
| You supply | You get back | |
|---|---|---|
| Reward/Risk tool | a quantity, and the levels | what that quantity risks |
| Position sizing | a risk budget, and the stop | the quantity |
Sizing is the one that has to happen first, because the stop distance decides the quantity. Move the stop two ticks and the correct size changes. That is the arithmetic worked through here.
Sierra Chart's own answer
This has been asked directly. On 14 March 2022 a user asked on the Sierra Chart support board whether it was possible to “calculate position size by entering balance/entry/stop and risk percentage like tradingview’s one”. Sierra Chart replied the next day:
“No, this is not directly supported in Sierra Chart.”
That is the platform vendor answering, in thread 72210. Nothing since has changed it: the Reward/Risk improvements in 2947 are about where the targets are drawn, not about working out the size.
What people do instead
- A spreadsheet on the second monitor. Accurate, and fine until the market is moving and the level you were sizing for is gone by the time you have typed it in.
- Mental arithmetic. Workable on round numbers, error-prone on a 17-tick stop, and the errors are asymmetric: overestimating the size is the one that hurts.
- A fixed size regardless of the stop. The most common approach and the most expensive. Trading two contracts with a 10-tick stop and two with a 40-tick stop means the second trade risks four times as much as the first, whatever your plan said.
Doing it on the chart
This site sells a custom study that does it: Position Size Calculator Pro works out the contract count from the dollar amount you are willing to risk and draws entry, stop and targets anchored to the candle, with the dollar risk and the reward-to-risk on the labels. It reads the tick size and tick value from your chart, and it never places, modifies or cancels an order.
$19.99 for the Standard edition, $29.99 for Pro, one-time. The setup guide and the known limits are public before you buy. If you would rather do the arithmetic yourself, the formula is here and it costs nothing.