Days to Hours Converter
Convert days, weeks, or months to total hours. Essential for project planning, scheduling, and time estimation.
Days to Hours Reference Table
| Days | Hours | Minutes | Seconds |
|---|
The Core Conversion
The relationship between days and hours is exact: 1 day = 24 hours. This is because Earth's rotation relative to the Sun takes approximately 24 hours (more precisely 24 hours 3 minutes and 56 seconds for a sidereal day, but the civil day is defined as exactly 86,400 seconds). To convert any number of days to hours, simply multiply by 24.
Cascading down: 1 day = 24 hours = 1,440 minutes = 86,400 seconds. These are fixed, exact conversions — no rounding required.
Weeks and Months in Hours
A week contains exactly 7 days = 168 hours = 10,080 minutes = 604,800 seconds. The week is a cultural convention (not an astronomical one) that dates back to ancient Babylon and has been adopted universally across cultures.
A month is trickier. Calendar months range from 28 to 31 days, so "hours per month" depends on which month. For estimation purposes, a 30-day month = 720 hours is the most common approximation. The exact values: January = 744 h, February = 672 h (normal) or 696 h (leap), March = 744 h, April = 720 h, and so on. The average month (365.2425 ÷ 12 days) is approximately 730.5 hours.
Practical Uses in Project Planning
Converting days to hours is essential for resource planning and scheduling. If a project spans 30 days with 2 developers working 8 hours/day, total capacity is 30 × 2 × 8 = 480 person-hours. Sprint planning in Agile typically uses 2-week sprints = 14 days = 336 hours total, minus weekends: 10 working days × 8 hours × team size.
For deadline tracking: if a launch is in 14 days, that's 336 hours — or about 10 business working days. Framing deadlines in hours can make urgency more concrete than day counts alone.
Common Reference Values
1 day = 24 h | 2 days = 48 h | 3 days = 72 h | 5 days = 120 h (work week) | 7 days = 168 h (calendar week) | 14 days = 336 h (fortnight) | 30 days = 720 h | 31 days = 744 h | 90 days = 2,160 h (quarter) | 180 days = 4,320 h (half year) | 365 days = 8,760 h (year) | 366 days = 8,784 h (leap year).
Working Hours vs. Total Hours
Total hours in a period (all 24 h/day) differs significantly from available working hours. A 30-day calendar month has 720 total hours but only roughly 160–176 working hours (20–22 business days × 8 h). A 7-day week has 168 total hours but only 40 standard working hours. When scheduling projects, be explicit about whether you mean calendar hours or working hours to avoid capacity overestimates.
Frequently Asked Questions
How many hours are in a day?
There are exactly 24 hours in a day. 1 day = 24 h = 1,440 min = 86,400 sec.
How many hours is 7 days (1 week)?
7 days = 168 hours. Calculation: 7 × 24 = 168.
How many hours is 30 days?
30 days = 720 hours. Calculation: 30 × 24 = 720. A good monthly approximation.
How many hours are in a week?
A week = 168 hours total. A standard work week = 40 hours (5 days × 8 hours).
How many hours are in a year?
365 days × 24 = 8,760 hours. Leap year: 366 × 24 = 8,784 hours.