Marine Engine Hours Calculator
Inputs
hrs
hrs/yr
hrs
hrs
Tab to move between fields
Results
Hours Until Service
30 hrs
Months Until Service
2.4 months
Hours Since Service70 hrs
Interval Used70%
Maintenance UrgencyOK
Next Service At350 hrs
Monthly Usage12.5 hrs/mo
1
Identify Input Parameters
4 parameters
= Current Engine Hours = 320, Annual Usage = 150, Last Service At = 250, Service Interval = 100
= 4 input(s) provided
2
Calculate Hours Since Service
Hours Since Service = max(0, Current Engine Hours − Last Service At)
= max(0, 320 − 250) = 70 hrs
= 70 hrs
3
Calculate Hours Until Service
Hours Until Service = Service Interval − Hours Since Service
= 100 − 70 = 30 hrs
= 30 hrs
4
Calculate Interval Used
Interval Used = (Hours Since Service ÷ Service Interval) × 100
= (70 ÷ 100) × 100 = 70%
= 70%
5
Calculate Months Until Service
Months Until Service = Hours Until Service ÷ (Annual Usage ÷ 12)
= 30 ÷ 12.5 = 2.4 months
= 2.4 months