Engine Hours / Maintenance Interval Calculator
Track when your vessel's next scheduled maintenance is due. Enter your current engine hour reading and the service interval to see hours remaining until service is required.
What this calculator determines
It calculates hours remaining until scheduled maintenance from current engine hours, last service hours, and service interval you enter.
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Examples
Standard oil change interval
Current: 2,840 hrs; last service: 2,500 hrs; interval: 500 hrs; 80 hrs/trip
Calculation
- Hours since service: 2,840 − 2,500 = 340 hrs
- Hours remaining: 500 − 340 = 160 hrs
- Trips remaining: 160 ÷ 80 = 2 trips
160 hours / ~2 trips until next service
Overdue service
Current: 3,100 hrs; last service: 2,500 hrs; interval: 500 hrs
Calculation
- Hours since service: 600 hrs
- Over interval by: 600 − 500 = 100 hrs overdue
Service overdue by 100 hours
Assumptions & Conventions
- Service interval basis
- Service interval is the manufacturer-recommended hours between services; enter the interval that applies to the service you are tracking.
- Overdue indication
- When current hours exceed the next service point, the result shows hours overdue rather than hours remaining.