Weeks → Days

Why Convert Weeks to Days?

Converting between weeks (wk) and days (d) is one of the most common time conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert wk to d saves time and prevents errors.

Time conversions between wk and d are fundamental in project management, cooking, fitness, and daily scheduling. Project managers convert between hours, days, and weeks when planning sprints and estimating delivery timelines. Cooking recipes specify times in minutes or hours depending on the technique. In fitness, interval training requires precise conversions between minutes, seconds, and sometimes hours for endurance events like marathons.

How to Convert Weeks to Days

To convert weeks to days, use the following formula:

For example, 5 wk = 35 d, 10 wk = 70 d, and 100 wk = 700 d. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

• Full-term pregnancy duration: 40 wk = 280 d
• One week: 1 wk = 7 d
• A standard two-week vacation: 2 wk = 14 d
• One year: 52 wk = 364 d
• Approximately one month: 4 wk = 28 d

Common Mistakes to Avoid

• Month/year ambiguity: "1 month" varies from 28 to 31 days. For precise calculations, always specify the exact number of days.
• Leap year errors: Don't assume 1 year = 365 days. For multi-year calculations, account for leap years (avg = 365.2425 days).
• Time zone confusion: When scheduling across time zones, always specify UTC offset. "3 PM" means different things in different countries.

Pro Tips

• Memorize the factor: 1 wk = 7 d. For quick mental math, remember this base conversion.
• Quick reference: 5 wk = 35 d · 10 wk = 70 d · 25 wk = 175 d · 50 wk = 350 d · 100 wk = 700 d
• Bookmark this page: Save this converter for instant access. It works offline once loaded — no internet needed.

Weeks to Days Conversion Table

All values in this table are mathematically exact per NIST SP 811.