What is Days to Cover?
Days to cover (also called the short interest ratio) measures how many days it would take for all short sellers to close ("cover") their positions, based on the stock's average daily trading volume.
Think of it as a measure of how "crowded" the short trade is relative to the stock's liquidity. A higher DTC means it would take longer for short sellers to exit, which creates more squeeze potential.
How to Calculate Days to Cover
Days to Cover = Total Short Position ÷ Average Daily Volume
Where average daily volume is typically measured over 20 trading days
Example Calculation
Suppose a stock has:
- - Total short position: 5,000,000 shares
- - Average daily volume: 1,000,000 shares
Days to Cover = 5,000,000 ÷ 1,000,000 = 5.0 days
This means it would take approximately 5 trading days for all short sellers to buy back their shares, assuming average volume.
Interpreting DTC Values
Low DTC (<2 days)
Short sellers can exit quickly. Lower squeeze risk as there is sufficient liquidity for shorts to cover without significantly moving the price.
Moderate DTC (2-5 days)
Starting to get crowded. Covering would take a meaningful portion of the stock's normal volume, which could push prices higher.
High DTC (5-10 days)
Significant crowding. Short sellers would dominate trading volume for a week or more if they tried to cover, creating strong upward price pressure.
Extreme DTC (>10 days)
Very high squeeze potential. Short sellers are effectively trapped — exiting would take weeks and likely cause dramatic price increases.
DTC and Short Squeeze Risk
Days to cover is a key indicator of short squeeze potential because it measures how difficult it is for short sellers to exit. When a positive catalyst hits a stock with high DTC:
1. Price Rises on News
A positive catalyst (earnings beat, contract win, regulatory approval) causes the stock price to rise.
2. Short Sellers Rush to Cover
Facing losses, short sellers start buying shares to close their positions. With high DTC, there isn't enough daily volume for everyone to exit quickly.
3. Buying Pressure Accelerates
Short covering creates additional buying pressure, pushing the price higher and triggering more short sellers to cover — a self-reinforcing cycle.
DTC + Short Interest = Better Analysis
DTC is most useful when combined with short interest percentage. A stock with 15% short interest and 8 days to cover is a much stronger squeeze candidate than one with 15% short interest but only 1 day to cover. Use our Squeeze Candidates tool to find stocks where both metrics align.
Limitations of Days to Cover
Volume Can Change Dramatically
DTC uses average volume, but actual volume can spike during squeeze events, meaning shorts may cover faster than DTC suggests. Conversely, if volume dries up, covering takes even longer.
Not All Short Selling is Bearish
Market makers and hedgers hold short positions for reasons other than directional bets. These positions may not be "squeezable" in the traditional sense.
Delayed Data
ASIC short position data has a T+4 trading day lag. By the time you see a high DTC reading, the situation may have already changed.
Using DTC on ASX Short Data
ASX Short Data calculates days to cover for every shorted ASX stock using the latest ASIC short position data and average daily trading volumes. You can:
- - View DTC rankings on our Days to Cover page
- - Filter by DTC in the Stock Screener
- - See DTC on individual stock pages alongside short interest and price data
- - Identify squeeze candidates where high DTC meets high short interest on the Squeeze Candidates page