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Laytime And Demurrage Calculator

Work out laytime and demurrage instantly with clear inputs, formula shown and shareable results.

About Laytime And Demurrage Calculator

Laytime is the time allowed for loading or discharging. Exceeding it puts the ship on demurrage, charged pro rata per day; finishing early may earn despatch, often at half the demurrage rate. Both are calculated on the difference in hours divided by 24.

Formula

Laytime settlement

Demurrage = (used - allowed) / 24 x daily rate; despatch applies when the difference is negative

Worked example

With the default values below, Laytime And Demurrage Calculator returns Amount payable or receivable of $21,083.33. Change any input above and every figure here is recalculated in your browser.

Inputs used

Laytime allowed
96 h
Laytime used
119 h
Demurrage rate per day
22,000
Despatch rate per day
11,000

Results

Amount payable or receivable
$21,083.33
Hours on demurrage
23.00 h
Days on demurrage
0.96 days
Outcome
Demurrage payable to owners

Step by step

  1. 1Values used
  2. 2Laytime settlement
  3. 3Amount payable or receivable= 21,083.33
  4. 4Hours on demurrage= 23.00 h
  5. 5Days on demurrage= 0.96 days
  6. 6Outcome= Demurrage payable to owners

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Marine results are planning estimates only. Verify against the vessel's approved stability booklet, loading manual, class society rules and applicable maritime regulations before loading or sailing.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Marine results are planning estimates only. Verify against the vessel's approved stability booklet, loading manual, class society rules and applicable maritime regulations before loading or sailing.

Frequently Asked Questions

Is despatch always half demurrage?

It is the common convention but it is negotiable, and some charters have free despatch (none payable at all).

Does bad weather stop laytime?

Only if the charter party says so. 'Weather working days' exclude time lost to weather; running days do not.

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