HOURSCALCULATOR

Time Duration

8 hours 30 minutes

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UK Working Hours Reference

Full-time week37.5 hours
Working Time Directive48h max/week
Standard day7.5 hours
Part-time threshold30 hours
Night worker limit8h per 24h
Rest break20 min per 6h

What Is an Hours Calculator?

An hours calculator helps you work out the duration between two clock times, add or subtract hours from a starting time, and convert hours into other units like minutes, days, and weeks.

How It Works

Enter your times in 24-hour format. The calculator handles overnight shifts automatically — if the end time is earlier than the start time, it assumes you've crossed midnight. Results update instantly as you type.

Formula

Duration = End Time − Start Time

With midnight rollover: if End < Start, add 24 hours. For example, 22:00 to 06:00 = (06:00 + 24:00) − 22:00 = 8 hours.

Tips & Best Practices

  • →

    Use the 'Night shift' preset for common overnight patterns like 10pm–6am

  • →

    The UK Working Time Directive limits average weekly hours to 48 — use Convert mode to check

  • →

    For payroll, remember that a 37.5-hour week usually means 7.5 hours per day excluding lunch

  • →

    Part-time workers have the same rights pro rata — use Between mode to track actual hours

Frequently Asked Questions

MD

Mandeep Singh · 25+ Years UK Financial Services

Important Information

This calculator is for informational purposes only and does not constitute financial advice or a personal recommendation.

Results are estimates based on the information you provide and may not reflect your actual financial position.

You should consider seeking independent professional advice tailored to your specific circumstances before making any financial decision.