**A purchased put already has a known maximum loss: the premium you pay, plus fees. You can also build a position that profits from a sufficiently large move in either direction.**

Your understanding of the put is broadly correct. You choose a **strike price** and an expiration date; the strike can be today’s price. The put gives you the right to sell the specified underlying asset at that strike. You pay a premium for this right.

For a standalone purchased put, the profit at expiration, per underlying unit, is:

\[
\text{Profit}=\max(K-S_T,0)-P
\]

Here, \(K\) is the strike, \(S_T\) is the underlying price at expiration, and \(P\) is the premium. Thus:

- Your maximum loss is \(P\), plus fees.
- Your expiration break-even price is \(K-P\).
- A small price decline can still leave you with a loss because you must recover the premium.

These are the [Options Industry Council’s long-put payoff rules](https://www.optionseducation.org/strategies/all-strategies/long-put).

For your edited question, **buying a put and a call with the same strike, expiration, and underlying quantity creates a long straddle**. The put benefits from a substantial fall; the call benefits from a substantial rise. Its maximum loss is the combined premiums, plus fees. This position expresses a view that the price will move substantially in either direction. [OIC’s long-straddle explanation](https://www.optionseducation.org/strategies/all-strategies/long-straddle).

For a hypothetical example, suppose a gold ETF trades at $100, and six-month options cost:

- $6 per share for a put with a $100 strike.
- $5 per share for a call with a $100 strike.

The combined cost is $11 per share. At expiration, ignoring fees:

| ETF price | Put value | Call value | Combined net profit per share |
|---:|---:|---:|---:|
| $80 | $20 | $0 | $9 |
| $95 | $5 | $0 | −$6 |
| $100 | $0 | $0 | −$11 |
| $105 | $0 | $5 | −$6 |
| $120 | $0 | $20 | $9 |

The expiration break-even prices are **$89 and $111**. For contracts covering 100 shares each, one put and one call would cost $1,100, which is the maximum option loss before fees.

So **yes, you can profit from either a large fall or a large rise while knowing your maximum loss beforehand**. You pay for that flexibility through both premiums, and you lose if the move is too small.

Two practical qualifications matter. These calculations describe expiration payoffs; selling earlier also depends on remaining time and implied volatility. Also, the loss cap applies to the option position: exercise can create a stock or futures position with additional risk, so check settlement rules and arrange to close or settle appropriately. [OIC discusses these pricing and expiration risks](https://www.optionseducation.org/strategies/all-strategies/long-put).

Finally, a rapid rise does not establish that gold must fall within six months. Your put needs a decline large enough, within its lifetime, to cover its cost.