Uptime calculator: downtime allowed and actual uptime
How much downtime an uptime target allows per year, month, week and day, and the uptime you actually reached from the hours a machine or system was down.
Your numbers
TargetActual See your resultResult
Your uptime 99.17%6.0 h down in 720 h Downtime allowed per year 43.8 hat 99.50% Per month / per week 3.7 h / 50.4 min Per day 7.2 min Stop working this out by handFleetZap sets a machine In service when its repair starts and Available when it’s done, and its reports total downtime and availability for every machine.
See FleetZap Maintenance · Try the demoThe formula
Uptime = (Hours in period − Hours down) ÷ Hours in period · Downtime allowed = Hours in period × (1 − Target)
With the example: 6 hours down in a 720-hour month is 99.17%, short of a 99.5% target that allows about 3.7 hours a month. For equipment, uptime usually counts against scheduled hours, not the calendar; say which in your target. The equipment availability guide explains the difference.
Using the numberWhat to do with it
- Agree what counts as down: planned maintenance is often left out of uptime but kept in availability.
- Track the causes of downtime, not just the hours; the top two or three usually explain most of it.
- Each extra nine costs more than the last. Set targets per machine by how much its downtime costs.
Guides behind this calculator
Equipment availability How to reduce equipment downtime How to calculate downtime costMore free calculators
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The heart of FleetZap, and everything a maintenance team needs in one place: work orders and preventive maintenance, inspections and the field app, plus a parts store with purchasing, compliance and certificate tracking, multi-location assets with a full lifecycle, and the KPIs that prove it’s working.
- Work orders
- Preventive maintenance
- Procedures, inspections & field app
- Parts & purchasing
- Compliance
- Assets, reports & KPIs
Good to know
How do you calculate uptime?Uptime = (hours in the period − hours down) ÷ hours in the period. 6 hours down in a 720-hour month is 99.17%.
How much downtime does 99.9% uptime allow?About 8.8 hours a year, 44 minutes a month or 1.4 minutes a day.
Is uptime the same as availability?Close, but definitions differ. Uptime often leaves planned maintenance out; availability for equipment usually counts it against scheduled hours. Say which you use.
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