Direct Answer
The straddle implied move is the cost of the at-the-money straddle (call plus put) divided by the underlying price. It is a market-quoted estimate of the expected absolute move to the option's expiry. It approximates the average absolute move priced in, which is about 0.8 of the one-standard-deviation implied move.
Straddle Implied Move: Formula, Meaning, Signals, Examples and How to Use It
How Is Straddle Implied Move Calculated?
The straddle implied move is the cost of the at-the-money straddle (call plus put) divided by the underlying price. It is a market-quoted estimate of the expected absolute move to the option's expiry.
Formula: straddle implied move % = (ATM call price + ATM put price) / S x 100
Inputs:
- At-the-money call mid price
- At-the-money put mid price (same strike and expiry)
- Underlying price S
Worked example. A 100 strike straddle costing 3.10 for the call and 2.90 for the put on a 100.00 underlying implies a move of 6.0%. The inputs are illustrative numbers, not market data.
Reading it. It approximates the average absolute move priced in, which is about 0.8 of the one-standard-deviation implied move. Traders use it to compare the size of an expected event move, such as earnings, with history.
Limits. It uses the expiry chosen, so it also includes moves unrelated to the event. Mid prices of wide quotes are imprecise, and the approximation to a standard deviation relies on the lognormal model.
What is Straddle Implied Move?
The straddle implied move is the cost of the at-the-money straddle (call plus put) divided by the underlying price. It is a market-quoted estimate of the expected absolute move to the option's expiry.
How to use Straddle Implied Move
It approximates the average absolute move priced in, which is about 0.8 of the one-standard-deviation implied move. Traders use it to compare the size of an expected event move, such as earnings, with history. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime.
Strengths
- It uses actual market prices for the call and put, so the figure comes from what traders pay and not from a volatility model's output.
- Dividing the straddle premium by spot gives a percent that approximates the expected absolute move and compares directly with past moves.
- Reproducible when the formula and data convention are fixed.
Weaknesses and limitations
- If the strike is not exactly at spot, one leg carries intrinsic value that inflates the cost relative to a true at-the-money straddle.
- The premium also includes time value that decays with theta, so the figure is for holding to expiry and not for a shorter horizon.
- Correlated indicators can create false confidence by repeating the same underlying information.
Editorial and risk note
This page is educational content, not individualized investment advice. It should not imply guaranteed prediction, accuracy or outperformance.
Frequently Asked Questions
Is Straddle Implied Move a buy or sell signal?
No. It approximates the average absolute move priced in, which is about 0.8 of the one-standard-deviation implied move. It uses the expiry chosen, so it also includes moves unrelated to the event. A trade built on it still needs a trigger, an invalidation rule, a position size and realistic execution assumptions.
What is the best setting for Straddle Implied Move?
Straddle Implied Move is computed from at-the-money call mid price; at-the-money put mid price (same strike and expiry); underlying price S, so the choices that matter are the data convention and the window it is read over. Test those across instruments, regimes and out-of-sample periods instead of fitting one historical winner.
Can Straddle Implied Move be used by itself?
It uses the expiry chosen, so it also includes moves unrelated to the event. Mid prices of wide quotes are imprecise, and the approximation to a standard deviation relies on the lognormal model. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone.
Does Straddle Implied Move work on every timeframe?
The calculation (straddle implied move % = (ATM call price + ATM put price) / S x 100) can be run on any bar size, but behavior is not portable: a reading on a five-minute chart describes a very different market window from the same reading on a daily chart. Validate the exact timeframe before relying on it.
Why does Straddle Implied Move give false signals?
If the strike is not exactly at spot, one leg carries intrinsic value that inflates the cost relative to a true at-the-money straddle. The premium also includes time value that decays with theta, so the figure is for holding to expiry and not for a shorter horizon. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated.
How should Straddle Implied Move be backtested?
Rebuild Straddle Implied Move from at-the-money call mid price using point-in-time data, write the rules before testing, include delisted securities where relevant, model realistic fills and costs, reserve a validation sample and compare with a simpler baseline.