Asset Availability
Asset availability is the percentage of scheduled time that an asset is in a condition to perform its function. It is calculated from uptime against planned operating time, and is a key input to overall equipment effectiveness and reliability reporting.
Asset availability is the proportion of scheduled time during which an asset is operational and able to perform its intended function. It is commonly expressed as a percentage and calculated as uptime divided by the sum of uptime and downtime over a defined period. Availability is a core reliability measure and one of the three factors in overall equipment effectiveness.
Why it matters
Availability directly affects output, revenue, and the ability to meet commitments. A small drop in availability on a critical asset can have a large operational and financial impact. Tracking availability over time reveals whether reliability is improving or declining, and pinpoints which assets are dragging down performance through frequent or lengthy outages.
How MapTrack helps
MapTrack logs downtime and return-to-service times on every work order, producing accurate uptime and availability figures per asset so teams can see at a glance which equipment is meeting its availability target.
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Frequently asked questions
How is asset availability calculated?
Availability is calculated by dividing the time an asset is operational (uptime) by the total scheduled time (uptime plus downtime), then multiplying by 100 to get a percentage. For example, if a machine is scheduled for 200 hours and is down for 20 hours, its availability is 180 divided by 200, or 90 per cent. Planned maintenance windows may be included or excluded depending on the definition used.
How are availability, MTBF and MTTR related?
Availability can be expressed using mean time between failures (MTBF) and mean time to repair (MTTR) as MTBF divided by the sum of MTBF and MTTR. This shows that availability improves either by increasing the time between failures or by reducing the time taken to repair them. Both reliability and maintainability therefore drive the final availability figure.
Related terms
Overall Equipment Effectiveness (OEE)
Overall equipment effectiveness (OEE) is a metric that measures how effectively a piece of equipment is used compared with its full potential. It is the product of three factors: availability (the share of scheduled time the asset is actually running), performance (its speed against the ideal rate), and quality (the proportion of good output). The result is a single percentage between 0 and 100.
Downtime
Downtime is any period during which an asset is unavailable for its intended function. It can be planned (scheduled maintenance, shutdowns, inspections) or unplanned (breakdowns, failures, waiting for parts). Downtime is typically measured in hours and expressed as a percentage of total available time, providing a key indicator of asset availability.
Mean Time Between Failures (MTBF)
Mean Time Between Failures (MTBF) is a reliability metric that measures the average elapsed time between inherent failures of a repairable system during normal operation. It is calculated by dividing the total operational time by the number of failures over a given period. MTBF is typically expressed in hours and is used to compare the reliability of assets, components, or equipment models.
Mean Time to Repair (MTTR)
Mean Time to Repair (MTTR) measures the average time required to diagnose and fix a failed asset and return it to operational status. It includes diagnosis, sourcing parts, performing the repair, and testing. MTTR is typically calculated by dividing the total repair time across all failures by the number of failure events in a given period.
Equipment Utilisation
Equipment utilisation measures the extent to which available equipment is being productively used, typically expressed as a percentage of available time or capacity. It is calculated by dividing actual usage time (or output) by total available time (or maximum capacity). Utilisation data can come from meter readings, operator logs, GPS tracking, or telematics systems. It is a key operational efficiency metric in asset-intensive industries.
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