Next PM due calculator

When the next preventive maintenance service comes due: the meter reading, the hours left and an estimated date from how many hours the machine runs each day.

Your numbers

Result

The formula

Due at = Meter at last service + Interval · Days left = (Due at − Meter now) ÷ Hours per day

Most fleets open the work order before the due reading, often at about 95% of the interval, so parts and a bay are ready. If a schedule also has a calendar limit (say every 250 hours or 6 months), service at whichever comes first. The hour meter guide covers getting readings you can trust.

What to do with it

• Count from the meter reading when the last service was actually done, not when it was due, or the schedule drifts.
• A machine that runs double shifts reaches its interval in half the calendar time; plan by hours, not by weeks.
• One wrong meter reading moves every date after it. Check new readings against the last one before you trust them.

Guides behind this calculator

FleetZap Maintenance Essentials

The heart of FleetZap: plan, schedule and close out every repair and service across your fleet.

• Work orders
• Preventive maintenance
• Procedures & inspections
• Field app

Good to know

Add the service interval to the hour meter reading at the last service. If the last 250-hour service was done at 4,600 hours, the next is due at 4,850. Divide the hours left by average daily use to estimate the date.

Plan to be ready a little before it. Many fleets open the work order at about 95% of the interval so parts and a bay are booked, and follow the manual's tolerance for early or late service.

Service at whichever comes first. A machine that runs few hours still needs its 6-month or yearly service, because fluids and seals age with time as well as use.

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