Free calculators
Free maintenance calculators for plant teams
These maintenance calculators work out OEE, MTBF and MTTR, injury rates and the cost of downtime from your own numbers, with the formula and a worked example on every page. They help your maintenance head, your reliability engineer and your EHS head get a clear answer in a few minutes.
Pick a maintenance calculator
OEE calculator
A free OEE calculator for availability, performance, quality and overall OEE from times and counts.
Open the calculatorMTBF and MTTR calculator
An MTBF calculator that also gives MTTR and availability from operating time, failures and repair time.
Open the calculatorLTIFR and TRIR calculator
Lost time injury frequency rate and total recordable incident rate from cases and hours worked.
Open the calculatorDowntime cost calculator
The cost of downtime per hour, month and year from lost contribution, idle labor and repairs.
Open the calculatorHow the calculators work
The inputs, the formulas and the worked examples on every calculator page are open to everyone. To see your own result, enter a work email once. You will not be asked again for six months.
Want to go deeper? Browse our guides and the glossary.