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This older Kefiw page is kept for reference, marked noindex, and removed from the primary sitemap. The current Kefiw experience is focused on property decisions: cost, quotes, damage, buying, selling, owning, and packets.

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Hours Calculation Mistakes: OT, Midnight, and Decimals

Five errors that cost workers real money every pay period.

Know the five traps and you stop missing ~1-2 paid hours per week.

Timesheets quietly lose workers hours every week. The errors are always the same five: midnight crossover, minute-to-decimal conversion, OT rate confusion, break double-counting, and rounding that always favours the employer.

Quick answer

Know the five traps and you stop missing ~1-2 paid hours per week.

What you are trying to do
Five errors that cost workers real money every pay period.
Best next step
Hours Calculator
Limit to remember
Treat this as a practical aid for the task, not a replacement for professional judgment.

Key points

  • ▸ Midnight crossover: 22:00 start, 06:00 end — naive subtraction gives negative 16h. Handle wraparound explicitly.
  • ▸ Minute-to-decimal: 30 minutes = 0.50 hours, 45 minutes = 0.75 hours. Not 0.30 or 0.45.
  • ▸ OT confusion: daily (>8h), weekly (>40h), and double-time thresholds often all apply. Run through them in order.
  • ▸ Break double-counting: an employer deducts a break you didn't take. Track actual breaks, not scheduled.
  • ▸ Rounding direction: "nearest 15 min" rounds both ways but employers often apply it only one way. Verify.

Examples

  • Night shift trap
    Start 23:00, end 07:00. Naive math: 7 - 23 = -16. Correct: 24 - 23 + 7 = 8 hours.
  • Decimal error
    Worker logs "8.45 hours" meaning 8h 45m. Payroll reads it as 8.45 decimal = 8h 27m. Lost 18 minutes.
  • Missed OT
    9h Mon, 9h Tue, 9h Wed, 9h Thu, 8h Fri = 44h weekly. In CA daily OT applies: 4h daily OT + weekly OT = more than simple 4h calculation.

When to use which tool

Related

Frequently asked questions

› How do I convert minutes to decimal? How-to

Minutes / 60. 15 min = 0.25, 30 = 0.50, 45 = 0.75. Anything else: fraction out of 60.

› What if my employer's timesheet disagrees with my calculation?

Bring your own calculation, documented. Most discrepancies are breaks or midnight crossover; the law usually favours the worker on honest disputes.

› How should I use this guide with a Kefiw tool? How-to

Use the guide as the plan and the linked Kefiw tool as the check. Read the steps first, try the move manually, then use the tool to compare outputs, catch edge cases, and decide whether the result actually fits your task.

› What mistake do tool guides help avoid? Troubleshooting

Tool guides help avoid using a utility mechanically without understanding what you are trying to accomplish. Most word, writing, and text utilities are fast, but speed can hide context mistakes. Know whether you are solving a puzzle, cleaning copy, drafting a line, or checking a rule.

› Can a tool guide help me learn the skill? How-to

A tool guide can help you learn if you pause before accepting the output and ask why it worked. Compare your first guess with the tool result, look for the rule or pattern, and repeat that review. Passive copying solves one task; active review builds the skill.