Calculadora de Fechas
Calcula días entre fechas o suma y resta días.
Difference
1 years, 8 months, 9 days
617 days • 88 weeks • 441 business days (Mon–Fri)
Total days
617
Weeks
88
Business days
441
How it works
Exact Gregorian calendar arithmetic: difference in Y/M/D with totals, business days Mon–Fri, and add/subtract days/weeks/months/years handling leap years and month lengths.
Quick Answer
Add or subtract days from a date, or find days between two dates, with weekday and business-day options — skips weekends if you pick.
What is this tool?
A date calculator moves a calendar forward or back by days, or measures the gap between two dates. You need it to set deadlines, plan delivery dates, or count business days that skip Saturdays and Sundays. Our tool shows weekdays for the result and counts correctly across months and leap years, locally.
How it works
We add/subtract days via calendar dates, not 24h blocks, to survive DST. Between dates we count exclusive/inclusive options and optionally skip weekends for business days. Local.
How to use — 4 steps
- 1Enter your numbers (dates, height, weight as asked).
- 2Pick options like DEG/RAD or activity level if shown.
- 3See result, formula, and chart update live.
- 4Copy or compare with related calculator.
Specs & formulas
| Item | Detail |
|---|---|
| Formula | See howItWorks for exact |
| Source | Authoritative (Mifflin, Navy, WHO, Naegele) |
| Privacy | Local |
| Note | Informational, not medical |
Quick reference
3 worked examples
1. Example 1
Try the example values on the page.
Result follows the formula shown
2. Example 2
Change one input to see effect.
Live update shows sensitivity
3. Example 3
Compare two options.
Switch activity or cycle to see shift
Mistakes to avoid
- Wrong units (cm vs inches).
- DEG vs RAD for trig.
- Forgetting cycle correction for due date.
Pro tips
- Double-check height in cm vs ft/in.
- Use DEG for school trig.
- For medical, see clinician.
When to use it
Homework, health screening, and planning dates. These tools give quick, private estimates with the formula shown so you can verify.
Frequently Asked Questions
Is it accurate?
Formulas are authoritative but estimates for health; verify with pro.
Private?
Yes — local, no upload.
Units?
Metric/imperial switch is on page.
Copy?
Use copy button to paste.
Medical?
Informational only — see clinician.