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Measure spread cost relative to the trade15 minute read
How wide is too wide for an option spread?
Learn how to judge an option bid-ask spread using dollars, midpoint percentage, quote size, expected edge, and possible round-trip execution cost.
Direct answer
There is no universal number of cents that makes an option bid-ask spread too wide. Judge the spread relative to the option premium, displayed size, order quantity, expected strategy edge, holding period, and likely cost to exit. A $0.10 spread is 50% of a $0.20 midpoint but only 1% of a $10 midpoint, so the same absolute width can imply radically different execution risk.
Calculate absolute and relative spread width
Absolute spread equals ask minus bid. A common relative measure is spread divided by midpoint, where midpoint equals bid plus ask divided by two. With a 1.90 bid and 2.10 ask, the spread is 0.20, midpoint is 2.00, and quoted spread is 10% of midpoint. State the formula because some platforms use ask, bid, or another denominator.
Translate the width into contract dollars. For a standard 100-multiplier contract, $0.20 equals $20 per contract across the full displayed spread. Ten contracts represent $200 of quoted width before fees or market movement. This is not a prediction that the entire spread will be paid, but it reveals the scale at risk.
Compare the width with the trade's expected edge
A spread becomes economically too wide when plausible entry and exit costs consume an unacceptable share of the expected benefit or risk budget. A short-horizon trade seeking $0.15 of edge cannot comfortably support $0.20 of one-way quoted width. A longer thesis may tolerate more dollars, but only if position size and exit scenarios remain viable.
Consider a round trip, not just entry. Even a midpoint entry does not guarantee a midpoint exit, especially after volatility falls, expiration approaches, or the underlying moves away from the strike. Stress the exit at the natural side and at worse levels when deciding whether the payoff survives execution friction.
Price alone does not describe liquidity
Read displayed size, timestamp, market status, underlying spread, nearby strikes and expirations, volume, and open interest. A narrow quote for one contract may not support a larger order. A temporarily wide quote around news, an opening rotation, or a fast stock can normalize; a persistent one-sided market is a different risk.
Minimum price increments also matter. A $0.05 tick creates a large percentage spread on a low-premium option even when participants quote adjacent ticks. Deep out-of-the-money and near-expiration contracts can therefore look extremely wide in percentage terms because the midpoint is small or zero.
Set a spread budget before placing the order
Define the largest absolute and relative width you will accept, plus maximum dollar slippage for the quantity. Use a limit order to protect the boundary and reassess if the quote or underlying changes. A midpoint limit can test price improvement, but it can remain unfilled and should not be chased without a valuation reason.
Skipping the trade is a valid execution decision. If the expected edge disappears under a realistic entry and exit, reducing size does not fix the per-contract economics. Choose a more liquid strike or expiration only if it still expresses the same thesis and risk—not merely because its quote looks tighter.
Common questions
What is a good bid-ask spread for options?
A good spread is small relative to premium and expected edge, has enough displayed or accessible size for the order, and supports a realistic exit. There is no universal percentage because strategy, product, volatility, quantity, and holding period differ.
How do I calculate option spread percentage?
One common calculation is (ask − bid) ÷ midpoint × 100, with midpoint equal to (bid + ask) ÷ 2. If bid or midpoint is zero, the percentage can be undefined or misleading; use absolute dollars and market context too.
Is a 10-cent option spread wide?
It depends. A $0.10 spread around a $0.20 midpoint is 50%, while the same width around $10 is 1%. Convert it to dollars per contract, compare displayed size and expected edge, and consider both entry and exit.
Can I always get filled at the midpoint of a wide spread?
No. Midpoint is arithmetic, not an executable promise. A limit at midpoint may attract interest or receive price improvement, but it can wait indefinitely if no counterparty accepts it. Live quotes and market movement can also shift the midpoint.
Sources and further reading
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