Date Calculator
Weeks Ago Calculator
Week presetsBusiness weeksReverse lookupCSV export
Mode
Weeks
1 week = 7 days
Quick Answer
4 weeks ago was April 28, 2026
12 weeks ago was March 3, 2026
How It Works
This calculator multiplies weeks by 7 (or 5 for business weeks) and subtracts that many days from today or a custom date. It correctly handles all calendar edge cases including month rollovers, year boundaries, and leap years.
Weeks to Days Conversion
| Weeks | Calendar Days | Business Days |
|---|---|---|
| 1 week | 7 | 5 |
| 2 weeks | 14 | 10 |
| 4 weeks | 28 | 20 |
| 6 weeks | 42 | 30 |
| 8 weeks | 56 | 40 |
| 12 weeks | 84 | 60 |
| 26 weeks | 182 | 130 |
| 52 weeks | 364 | 260 |
Common Use Cases
- Project tracking — what date was the start of a sprint X weeks ago?
- Medical tracking — when was a checkup 6 weeks ago?
- Payroll and HR — calculating dates for biweekly pay periods
- Pregnancy tracking — calculating gestational weeks
- Fitness and health — tracking progress over weeks