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Short Interest Ratio (Days To Cover)

short interest divided by average daily volume; how many days a full unwind would take

The short interest ratio, usually called days to cover (DTC), is total short interest divided by average daily trading volume. It answers one question: how many days of normal trading would it take for every short seller to buy back their shares.

In short
  • A liquidity ratio, not a timing signal. Higher DTC means a short unwind is harder and slower, which raises the temperature of a squeeze setup.
  • Above 5 days is a meaningful liquidity constraint on short covering; above 10 is severe.
  • The numerator (FINRA short interest) refreshes twice a month; the denominator (volume) updates daily, so DTC moves on both halves.
How its calculated

How is Short Interest Ratio (Days To Cover) calculated?

days_to_cover = total_short_interest / average_daily_volume

total_short_interest: FINRA bi-monthly short-interest report (about 10 business days after settlement)
average_daily_volume: mean consolidated-tape volume over the window (30 sessions is the common convention)

The numerator is the same FINRA bi-monthly count behind short interest. The denominator is a rolling average of traded volume. Because the two halves refresh on different schedules, a volume spike can depress DTC the day after a huge session even though the short position has not changed.

What traders use it for

What do traders use Short Interest Ratio (Days To Cover) for?

  • Assessing the liquidity constraint on a squeeze. A name with 25% short interest and DTC of 12 needs weeks of full-volume sessions to unwind; the constraint is what makes a forced cover violent.
  • Cross-checking momentum moves. A runner with rising RVOL and falling DTC is having its short side rapidly unwound; rising RVOL with stable DTC is more likely new long buying.
  • Ranking crowded shorts. On the squeeze leaderboard, DTC sorts the set by how hard an exit would be, which is a different ranking than size of the short position alone.
Worked example

Worked example

Worked example: $GME
Days to cover on $GME during a stress window

Suppose GME short interest is 60.0M shares from the FINRA report dated 2026-04-15, and the 30-day average daily volume is 12.4M shares. Days to cover = 60.0 / 12.4 = 4.84 (as of report date 2026-04-15). A DTC near 5 means a full unwind would take roughly a trading week of typical volume, a meaningful liquidity constraint on short covering.

Live data: /stock/GME.

Common pitfalls

What are common pitfalls of Short Interest Ratio (Days To Cover)?

  • Inherits the FINRA settlement lag. The numerator is typically 2 to 4 weeks old; pair with daily borrow-fee and utilization feeds before trading on it.
  • Volume spikes inflate the denominator and depress DTC. After a 5x-volume session the ratio drops even though no short has covered.
  • Window choice matters. A 30-session average is the common convention; a 10-session window is more responsive but noisier, and platforms that differ here are not comparable.
  • DTC says nothing about the catalyst. High DTC is dry powder; what ignites it is news flow, not the metric.
Where it appears on Tapeboard

Where this metric appears on Tapeboard

Days to cover renders on the squeeze leaderboard rows (/short-squeeze-stocks family) and on /scanner rows for the short-squeeze screen; it is context alongside the squeeze score, not an input to it (weight 0 in the current setup).

Related TERMS

Related terms

  • Short Interest: FINRA short-interest reports settle bi-monthly with a publication lag of about 10 business days from the report date.
  • Utilization (Lending): Daily-published, sourced from broker-dealer stock-loan books.
  • Squeeze Score: Gate: short interest >= 15% of float (latest published FINRA settlement, split-checked). Listed common stock, price >= $1, liquid, market cap >= $25M.
  • Failures-To-Deliver (FTD): Bi-monthly SEC dataset, lag of about two weeks. Counts unsettled share volume per ticker per day.
Primary sources

Primary sources cited

See it live

See it live

The squeeze leaderboard ranks heavily shorted names daily and prints days to cover on every row, next to short interest, borrow fee, and utilization.

Page review

Methodology last reviewed 2026-10-24 by Marcus Reilly, Editor at Tapeboard. Every claim on this page has a row in the citation registry. Glossary terms reverify on the Jan 15 / Apr 15 / Jul 15 / Oct 15 cron and any time the underlying primary-source publishes a methodology change. See methodology for the full fact-check process and corrections for the public correction log.

Disclaimer. This page is for educational and informational purposes only. Nothing on Tapeboard is investment advice. See the full risk disclaimer.