Short Interest Ratio Calculator
Calculate days to cover, short float percentage, and identify potential short squeeze candidates. Essential for analyzing bearish sentiment and squeeze opportunities.
Total number of shares sold short
Average shares traded per day (typically 30-day average)
Shares available for public trading
Where to Find This Data
- • Short Interest: FINRA, Yahoo Finance, Nasdaq
- • Avg Volume: Any stock quote page
- • Float: Yahoo Finance Statistics tab
Moderate short squeeze potential. Some pressure on shorts if buying momentum increases.
Days to Cover = Short Interest ÷ Avg Daily Volume
Short Float % = (Short Interest ÷ Float) × 100
How to Use the Short Interest Ratio Calculator
- Enter Short Interest: Input the total number of shares currently sold short. This data is reported bi-monthly by FINRA and available on financial websites.
- Enter Average Daily Volume: Input the average number of shares traded per day, typically calculated over 30 days.
- Enter Float: Input the number of shares available for public trading (excludes insider and institutional locked shares).
- Analyze Results: Review the days to cover, short float percentage, and squeeze risk assessment to evaluate the stock's short interest dynamics.
What is Short Interest Ratio (Days to Cover)?
The Short Interest Ratio, also known as Days to Cover, measures how many days it would take for all short sellers to cover their positions based on average daily trading volume. It's calculated by dividing the total short interest by the average daily volume.
A higher days-to-cover ratio indicates that short sellers would need more time to buy back shares, which can create upward price pressure if positive news triggers a rush to cover positions—a phenomenon known as a short squeeze.
Understanding Short Float Percentage
Short Float Percentage represents the proportion of a stock's tradable shares that are currently sold short. It's calculated by dividing short interest by the float and multiplying by 100.
- Below 10%: Generally considered normal short interest
- 10-20%: Elevated short interest, bears are betting against the stock
- Above 20%: Very high short interest, potential squeeze candidate
- Above 40%: Extremely high, rare and often indicates significant bearish sentiment
Identifying Short Squeeze Candidates
A short squeeze occurs when a heavily shorted stock's price rises, forcing short sellers to buy shares to cover their positions, which further drives up the price. Key indicators of potential short squeeze candidates include:
- High Days to Cover (5+ days): Shorts need more time to exit positions
- High Short Float % (15%+): Large portion of float is shorted
- Low Float: Limited supply amplifies price movements
- Positive Catalyst: News or events that could trigger buying
Why Traders Monitor Short Interest
- Sentiment Indicator: High short interest reflects bearish sentiment from sophisticated traders
- Squeeze Potential: Identify stocks that could experience rapid price increases
- Contrarian Signal: Some traders view high short interest as a potential buying opportunity
- Risk Assessment: Understand the forces that could impact stock price
FAQs
What is a good days to cover ratio?
There's no universally "good" ratio—it depends on your strategy. For short squeeze hunters, 5+ days is interesting. For long-term investors, lower ratios (under 3 days) indicate less bearish pressure. Very high ratios (10+ days) can signal extreme bearish sentiment or squeeze potential.
How often is short interest data updated?
FINRA requires short interest to be reported twice monthly, around the 15th and end of each month. The data is typically published about 11 business days after the reporting date, so there's always some lag in the information.
Can short interest exceed 100% of float?
Yes, this can happen through a process called "rehypothecation" where the same shares are borrowed and shorted multiple times. This occurred famously with GameStop in early 2021 when short interest exceeded 140% of float.
Is high short interest always bearish?
Not necessarily. While high short interest indicates bearish sentiment, it also creates potential buying pressure when shorts need to cover. Some traders specifically look for heavily shorted stocks with improving fundamentals as contrarian plays.
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