Industrial minutes are a decimal representation of time in which one hour is divided into 100 units instead of 60. They significantly simplify the calculation of wages, overtime, and working hours. The conversion formula is: Regular minutes ÷ 60 × 100 = industrial minutes.
What Are Industrial Minutes?
Industrial minutes — also known as decimal minutes or commercial minutes — are a method of representing time using the decimal system. While standard clock time is based on the sexagesimal system (60 seconds = 1 minute, 60 minutes = 1 hour), industrial minutes divide one hour into exactly 100 equal units for calculation purposes.
One industrial minute therefore equals 0.6 regular minutes — or put another way: 60 regular minutes equal exactly 100 industrial minutes. This seemingly small shift makes a significant practical difference, as it enables direct calculation with decimal numbers without having to account for fractions or remainders.
Alongside the term "industrial minutes", you will also encounter the related terms industrial hours (an hour expressed with decimal places, e.g. 7.5 h for 7 hours 30 minutes) and industrial seconds (one minute = 100 units, though rarely used in practice).
Why Industrial Minutes? Origins and Practical Relevance
History and Background
The concept of decimal time emerged during the industrial age, when commercial bookkeeping and payroll processing became increasingly mechanised. Calculators and later computers operate in the decimal system — not in the sexagesimal system used for clock time. The introduction of industrial minutes was a pragmatic response to this conflict.
Advantages Over Standard Time Representation
The key advantage lies in simplified multiplication. A concrete example illustrates this:
Standard time calculation: An employee works 7 hours and 45 minutes. The hourly rate is £15. The calculation: 7 h × £15 = £105 plus 45/60 h × £15 = £11.25 — totalling £116.25. Prone to error.
With industrial minutes: 7 hours 45 minutes = 7.75 industrial hours. Calculation: 7.75 × £15 = £116.25. A single, error-free step.
Industrial minutes therefore reduce calculation errors and speed up payroll processing — particularly for variable working hours, shift work, and overtime.
Who Uses Industrial Minutes?
Industrial minutes are widely used in the following areas:
- Payroll accounting and tax advisory (standard format in payroll software such as DATEV or Sage)
- Time tracking systems across businesses of all sizes
- Collective agreements in certain industries that specify working hours in decimal format
- Project controlling and performance tracking (e.g. in agencies or consulting firms)
Converting Industrial Minutes: Formula, Examples, and Table
The Conversion Formula
Conversion works in two directions:
Regular minutes → Industrial minutes:
Regular minutes ÷ 60 × 100 = Industrial minutes
Industrial minutes → Regular minutes:
Industrial minutes ÷ 100 × 60 = Regular minutes
Simplified: divide regular minutes by 0.6 to obtain industrial minutes. Conversely, multiply industrial minutes by 0.6 to get regular minutes.
Practical Calculation Examples
Quick Reference: Conversion Table (Minutes)
Industrial Minutes in Payroll Accounting
Why Payroll Becomes Easier
Payroll systems such as DATEV, Lexware, or Sage almost universally use decimal format internally. The reason is straightforward: gross wages can only be calculated correctly without intermediate steps when using decimal numbers. When your time tracking system outputs hours in decimal form and your payroll software expects the same format, manual conversions become unnecessary — eliminating a common source of errors.
Decimal representation is also used when calculating overtime premiums, short-time working allowances, or part-time remuneration. Even when employees record their working hours in standard clock time (e.g. 08:15–17:00), the software processes these in industrial minutes in the background.
Common Errors and How to Avoid Them
The classic mistake: minutes are treated as decimal places. Entering 7 hours 30 minutes as "7.30 industrial hours" instead of "7.50" means calculating 12 minutes too few — which at an hourly rate of £15 already creates a £3 discrepancy per shift. Systematic errors lead to claims for back payment or recoupment, which can have legal consequences under applicable employment law.
Error prevention checklist:
- Always check which format your time tracking system uses for output (clock time or decimal?)
- Verify format compatibility between time tracking and payroll software interfaces
- Inform employees about the difference between clock time and decimal time when recording manually
- Conduct spot checks during the monthly payroll run
Time Tracking and Industrial Minutes
Legal Time Recording Requirements
In Germany, employers have been broadly required to record working time since the Federal Labour Court (BAG) ruling of September 2022 (case ref. 1 ABR 22/21), which builds on the ECJ ruling of 2019. The Working Time Act (ArbZG) governs the recording obligation for deviations from standard daily working hours in § 16. The Minimum Wage Act (MiLoG) requires documentation for certain employment groups under § 17.
Whether recorded times are stored in clock format or as industrial minutes is not prescribed by law. What matters is that working time is documented accurately, completely, and verifiably.
Note for non-German contexts: While specific statutory references apply to Germany, the practical use of industrial minutes in payroll software and time tracking systems is common across many countries. Always consult applicable local legislation for compliance requirements.
Software Support
Most professional HR and time tracking systems — including DATEV, Personio, SAP HCM, and Sage HR — support both formats and allow the display format to be selected in the system configuration. HR professionals are advised to check, before introducing a new system, whether the time tracking and payroll software use the same decimal format, and whether the interface between the two systems is correctly configured.
Frequently Asked Questions About Industrial Minutes
What are industrial minutes?
Industrial minutes are a decimal representation of time in which one hour is divided into 100 units instead of 60. They are also known as decimal minutes or commercial minutes and significantly simplify mathematical calculations in payroll accounting and time tracking.
How do I convert industrial minutes into regular minutes?
The formula is: Industrial minutes ÷ 100 × 60 = regular minutes. Example: 75 industrial minutes ÷ 100 × 60 = 45 regular minutes. The reverse applies: Regular minutes ÷ 60 × 100 = industrial minutes.
How much is 0.5 industrial hours?
0.5 industrial hours equals exactly 30 regular minutes (0.5 × 60 = 30). This corresponds to half an hour.
Why are industrial minutes used in payroll accounting?
The decimal system enables the direct multiplication of working time and hourly rate without intermediate steps. Example: 7.75 industrial hours × £15 hourly rate = £116.25 gross pay — without complex minute-based calculations. This computational advantage is the main reason why industrial minutes became the standard in commercial software.
Are industrial minutes legally required?
No. There is no legal requirement to record working hours in industrial minutes. Collective agreements or works agreements may stipulate decimal format, but this varies by industry. Statutory time recording obligations (e.g. ArbZG § 16, MiLoG § 17 in Germany) do not prescribe a specific display format.
What is the difference between industrial minutes and industrial seconds?
With industrial minutes, one hour is divided into 100 units. With industrial seconds, one minute is divided into 100 units. Industrial seconds are rarely encountered in practice; industrial minutes are the established standard in commercial time tracking.
Which time tracking systems use industrial minutes?
Most professional HR and payroll programmes support the decimal format: DATEV, Personio, SAP HCM, Sage HR, Lexware, and others. The setting determining whether times are displayed in clock format or decimal format is typically selectable in the system configuration.
What happens when payroll calculations contain conversion errors?
Incorrect conversions lead to over- or underpayment. Employees are entitled to back payment in cases of underpayment under applicable employment law. Systematic errors can also result in further legal consequences. Regular spot checks during payroll processing are therefore strongly recommended.
Conclusion
Industrial minutes are a practical tool in commercial time tracking: they replace error-prone minute-based calculations with a decimal system that is directly compatible with payroll calculation and HR software. For HR professionals, it is important to understand the difference between standard clock time and decimal time — and to ensure that all systems in use share the same format. Conversion errors are avoidable, but they can carry legal and financial consequences if left unchecked.
Would you like to make your recruiting process more objective and efficient? The Aivy platform supports HR professionals with scientifically validated aptitude diagnostics tools for fair and structured personnel selection: Learn more.
Sources
- Arbeitszeitgesetz (ArbZG) – in particular § 16 Recording Obligation. Federal Ministry of Justice, Germany, 2023. https://www.gesetze-im-internet.de/arbzg/
- Mindestlohngesetz (MiLoG) – § 17 Documentation Obligation. Federal Ministry of Justice, Germany, 2023. https://www.gesetze-im-internet.de/milog/
- Bürgerliches Gesetzbuch § 611a – Employment Contract and Remuneration. Federal Ministry of Justice, Germany, 2023. https://www.gesetze-im-internet.de/bgb/__611a.html
- BAG ruling on time recording obligations, case ref. 1 ABR 22/21. Federal Labour Court, Germany, September 2022.
- Time Tracking in the Workplace – A Guide. Haufe-Lexware GmbH, 2023. https://www.haufe.de/personal/hr-management/zeiterfassung
- DATEV Glossary: Payroll and Wages. DATEV eG, 2024. https://www.datev.de
Make a better pre-selection — even before the first interview
In just a few minutes, Aivy shows you which candidates really fit the role. Beyond resumes based on strengths.
