Days to Cover

Days to Cover is a metric that estimates how many trading days it would take for short sellers to cover (buy back) all their shorted shares at the current average daily volume. It indicates the potential duration of a short squeeze.

Formula

Days to Cover = Short Interest ÷ Average Daily Volume

If a stock has 10 million shares shorted and average daily volume of 1 million, days to cover = 10 days.

Example

GameStop (GME) during the 2021 short squeeze had short interest of 140 million shares and daily volume spiking to 100 million+ shares, for days to cover of just over 1 day. This meant shorts could technically cover in a day if they wanted, but the buying pressure created a squeeze. AMC (AMC) had even higher days to cover at certain points, extending the squeeze.

How to Interpret It

• Low days to cover (< 2 days): Shorts can cover quickly, limiting squeeze duration. Squeeze would be brief unless volume drops.
• Moderate days to cover (3-10 days): Shorts need several trading days to cover. Extended squeeze window if volume remains steady.
• High days to cover (> 10 days): Shorts have a long road to cover. Prolonged squeeze potential if they're forced to buy rapidly.
• Rising days to cover: Increasing short interest or declining volume stretches covering time.
• Falling days to cover: Declining short interest or rising volume compresses covering time, ending the squeeze.

Limitations

• Days to cover assumes shorts will passively cover at current volumes, not accounting for panicked buying that would accelerate covering.
• If a stock halts, gets delisted, or faces liquidity issues, days to cover become meaningless because covering becomes difficult.
• Naked short selling (estimated but not officially counted) can inflate actual squeeze risk beyond reported days to cover.
• Shorts aren't forced to cover immediately; they only cover when they choose to or are forced (margin call). Days to cover is worst-case, not a prediction.

Related Terms

• Short Interest — the numerator of days to cover
• Average Volume — the denominator of days to cover
• Short Squeeze — what days to cover helps predict
• Liquidity — the ability to buy or sell quickly at volume