Financial research concept

Shipping Off-Hire Days: Vessel Downtime and Lost Earning Capacity

Shipping off-hire days measure vessel time unavailable for normal earning activity. Learn common causes, the utilization link, and why off-hire definitions matter.

By Lee BaileyPublished Sep 21, 2026
Research context

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Research date
Sep 21, 2026Use the dated article and cited sources for the definition, examples, and stated limitations.
Operating-model context
12 connected conceptsPart of the reviewed Shipping Operating Model; issuer definitions remain distinct where disclosed.
Company examples
1 reviewed companyRelationships reflect supported examples, not a normalized cross-company KPI ranking.
  1. Off-hire days versus available days
  2. Utilization relationship
  3. Why off-hire matters
  4. Separate planned and unplanned downtime
  5. Filing example
  6. Part of the Shipping Operating Model
  7. See It in Company Research
  8. Continue Research

Shipping off-hire days measure vessel time that is unavailable for normal earning activity under an issuer's methodology.

Common causes include repairs, drydockings, special surveys, upgrades, positioning, and other operational interruptions.

Off-hire days versus available days

Vessel Available Days often remove specified scheduled maintenance from the fleet's ownership-day base.

Off-hire definitions can be broader and may include additional downtime.

That means investors should not assume every issuer uses the same bridge from ownership days to available days or from available days to operating days.

Utilization relationship

Some issuers define utilization using a relationship similar to:

text
1Net Earnings Days = Earnings Capacity Days - Off-Hire Days
2
3Utilization = Net Earnings Days ÷ Earnings Capacity Days

Other shipping companies use operating days divided by available days instead.

The economic idea is similar, but the denominator and exclusions can differ.

Why off-hire matters

Rising off-hire days can reduce:

  • revenue-producing vessel time;
  • fleet utilization;
  • TCE-generating days; and
  • near-term cash generation.

But off-hire is not automatically negative. Planned drydockings, upgrades, and special surveys can preserve vessel condition or improve future efficiency.

Separate planned and unplanned downtime

Investors should distinguish:

  • scheduled drydock and survey days;
  • upgrade-related downtime;
  • repair-related downtime;
  • accident or damage downtime;
  • positioning after vessel delivery; and
  • commercial or charter-related inactivity.

Recurring unexpected off-hire can signal a different issue from a planned fleet-renewal program.

Filing example

Tsakos Energy Navigation defines off-hire days to include repairs, drydockings and special surveys, vessel upgrades, initial positioning after delivery, and repositioning before employment. Genco separately forecasts scheduled off-hire days associated with future drydockings.

Sources:

Shipping off-hire days are a downtime measure. Pair them with the issuer's capacity-day denominator, utilization formula, drydock schedule, and reason for downtime.

Part of the Shipping Operating Model

Connect fleet scale and age, owned and chartered capacity, availability, utilization, market exposure, daily earnings, and vessel costs to understand shipping operating economics.

How the model fits together
  • Fleet capacity and utilization: Ownership days measure time-weighted fleet size, available days remove specified scheduled off-hire, operating days remove additional off-hire, and fleet utilization relates operating days to the available-day base.
  • Daily revenue and vessel cost: Time-charter-equivalent rate converts shipping earnings to a per-day revenue measure, while daily vessel operating expense converts recurring vessel-level costs to a per-day basis so investors can compare unit economics across changes in fleet size and utilization.
  • Fleet scale, availability, and market exposure: Fleet deadweight tonnage and average fleet age describe physical capacity and fleet quality, chartered-in and earnings-capacity days extend the controlled fleet beyond owned vessels, off-hire days identify lost earning time, and spot-market days show how much employed capacity remains exposed to current freight rates.

See It in Company Research

These companies are examples of how the concept is reported or discussed in public filings. Definitions can differ by issuer; these links open company research rather than a normalized metric comparison.

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