📖 Overview
Estimate available working hours for project planning sprint sizing and deadline management.
🧪 Example Scenarios
Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.
| Input | Base Case | Higher Pressure Case |
|---|---|---|
| Calendar Days Until Deadline | 0 | 0 |
| Working Days Per Week | 14 | 16.8 |
| Hours Per Working Day | 5 | 6 |
⚙️ How It Works
Estimates available working hours before a deadline by converting calendar days to working days (using your weekly schedule) and multiplying by daily hours.
The Formula
Working Days = floor(Calendar Days × Working Days/Week ÷ 7) | Working Hours = Working Days × Hours/Day
| Calendar Days | Total days until the deadline from today |
| Working Days/Week | Your typical work days per week (e.g., 5 for Mon–Fri) |
| ÷ 7 | Converts weekly rate to a per-day proportion |
| Hours/Day | Productive hours per working day |
💡This formula gives a practical estimate but does not account for public holidays. If your deadline spans a holiday week, subtract those days from your calendar days input.
Quick Reference
| Calendar days | 5-day week × 8h | 5-day week × 6h | 4-day week × 8h |
|---|---|---|---|
| 7 days | 40 h | 30 h | 32 h |
| 14 days | 80 h | 60 h | 64 h |
| 30 days | 171 h | 129 h | 137 h |
| 90 days | 514 h | 386 h | 411 h |
When To Use This
- Use this tool when you need a fast decision during active planning or execution.
- Use this before committing money, time, or tradeoffs that are hard to reverse.
- Use this to compare options using the same assumptions across scenarios.
Edge Cases To Watch
- Results can be misleading if key inputs are missing, stale, or unrealistic.
- Very small or very large values may amplify rounding effects and interpretation risk.
- If assumptions change mid-decision, recalculate before acting.
Practical Tips
💡 Use this during sprint planning to verify a deadline is achievable given team capacity.
💡 Subtract planned leave, public holidays, and meeting-heavy days for a realistic figure.
💡 Hours/day = 6 is often more realistic than 8 once meetings, email, and breaks are accounted for.
Frequently Asked Questions
❓ Does this account for weekends?
Yes — the formula scales calendar days by your working days per week fraction, effectively excluding non-working days.
❓ What if I work weekends?
Set working days/week to 7 and the calculator will treat every day as a working day.