Time to repair calculator
Work out how long a typical repair takes (MTTR) using your own figures. Check the assumptions before you act on the result.
Your figures
Result
- Mttr hours
- 5.88 hours
How it is worked out
MTTR = total repair time ÷ number of repairs
mttr_hours = total_repair_hours/number_of_repairs
What it works out
The time to repair calculator turns records from the business into a figure for this decision: how long a typical repair takes (MTTR). Use it when the responsible maintenance in-charge needs a consistent answer for this specific task. The answer uses only the values entered. Record the measurement period beside it.
What you need
| Input | Unit | Where to find it |
|---|---|---|
| Total repair hours (example: 47 hours) | hours | Read total repair hours from the job card, shift report, machine log or maintenance register. |
| Number of repairs (example: 8) | units | Read number of repairs from the job card, shift report, machine log or maintenance register. |
Use the same item, period and measurement unit for related inputs. If a figure comes from an estimate rather than an actual record, mark it as estimated. Keep your original figures beside the result.
The formula
In plain words, calculate MTTR hours using the measured inputs below. The expressions are shown without hidden rounding so they can be checked by hand.
- MTTR hours:
mttr_hours = total_repair_hours/number_of_repairs.
Formula basis from the supplied taxonomy: MTTR = total repair time ÷ number of repairs. The calculation assumes the named inputs describe the same job and accounting period. Keep quantities, rates and measured units consistent.
A worked example
Illustrative example: a pump assembly workshop uses the figures in the table above. These are example inputs, not industry averages. For this example, the main figures are total repair hours: 47 hours, number of repairs: 8.
- Mttr hours:
total_repair_hours/number_of_repairs. With the example figures,47.0 / 8.0gives 5.88 hours.
How to act: Use the result to check the machine or service log. Write down the input date and the assumption that could move most.
How to read the result
Example bands, change them for your business:
- Comfortable: Your result meets the target for this item or reporting period. Keep the calculation with its source records and check the machine or service log.
- Watch: The result is close to your action limit, or it changed since the previous calculation. Recheck total repair hours and number of repairs using the original records.
- Act: The result breaks a limit already agreed by the manager or owner. Record the difference, name a responsible person, and agree a correction date. For an operational starting point, read [Machines break down](/problems/machines-break-down) and [Breakdown to recovery](/processes/breakdown-to-recovery). Do not use these example bands as published industry benchmarks.
Copy it into a spreadsheet
Create a sheet with column A for the label and column B for the number or formula. The expressions work in Excel or Google Sheets. Keep input cells editable and result cells protected from typing.
| Cell | Label | Value or formula |
|---|---|---|
| B2 | total repair hours | 47.000000 |
| B3 | number of repairs | 8.000000 |
| B5 | MTTR hours | =(B2/B3) |
For any formula containing a divisor, enter a value above zero. For any monetary output, format the cell in Indian rupees. Do not replace the cells with rounded figures until the final display.
What this calculator leaves out
- Estimated electricity loads, failure causes and downtime losses need a site check.
- A single average can hide unusual lots, customers or weeks. Review the underlying entries before making a large decision.
- The formula does not check whether the records are complete. Read the machine hour meter, repair log and utility bills from the same period. Split planned stops from faults.
Common mistakes
- Mixing periods. Using total repair hours from one month with number of repairs from another produces a number that looks precise but is hard to act on.
- Trusting old figures. Recheck the relevant source record before reusing last month's saved inputs. Check the largest cost or longest breakdown first; an average can hide one critical failure.
- Treating an estimate as approval. Record which assumptions were entered by hand. Get the relevant owner, accountant or technician to check unusual values.
A number like this helps only if someone works it out again when things change.
Questions people ask
Where do I find the numbers for time to repair calculator?
Read total repair hours from the job card, shift report, machine log or maintenance register. Read number of repairs from the job card, shift report, machine log or maintenance register. Keep all inputs from the same period.
Can I use this number to approve a purchase or payment?
Use it as a first check. Use the result to check the machine or service log. Write down the input date and the assumption that could move most. If the result affects tax, legal duties, workplace safety or a major investment, obtain the appropriate review.
When should I calculate it again?
Recalculate when a meaningful input changes, and at the next regular review of the relevant register. Save the date and the input values so changes can be explained.