Month Calculator
Discover exactly how many months sit between two dates, with a breakdown into years and carryover days.
Start: Sunday, January 1, 2023
End: Wednesday, November 26, 2025
Total months: 34
Breakdown: 2 year(s), 10 month(s), 25 day(s)
Total days: 1,060
How to Use This Calculator
Set your start date
Choose the earlier date in your schedule, contract, or project.
Set your end date
Pick the later date. The tool handles any span—days, months, or decades.
Review the breakdown
See total months plus the year/month/day breakdown for precise reporting.
Formula
Total Months = (End Year − Start Year) × 12 + (End Month − Start Month)
If End Day < Start Day → subtract 1 month and recompute leftover days
Years = floor(Total Months ÷ 12)
Remaining Months = Total Months mod 12
Example: 2023-01-15 to 2025-11-09 → 34 total months → 2 years, 10 months, 25 days → 664 total days.
Why Count Months?
Months provide a friendly middle ground between weeks and years. Knowing month spans helps with loan amortization, maternity leave, marketing calendars, and more.
- Track project phases in monthly increments.
- Calculate age milestones (e.g., 18 months old).
- Plan subscription billing cycles.
- Sync product roadmaps with quarterly goals.
Frequently Asked Questions
Does this consider month length differences?
Yes, leftover days come from actual calendar differences, so February and 31-day months are handled correctly.
Can I include the end date?
Yes—both dates are inclusive. For exclusive spans, nudge one date by a day as needed.
Does it support BCE years?
This tool uses the modern Gregorian calendar, best suited for dates from 1582 onward.
What about business months?
Business months vary by industry. Combine this tool with business-day calculators for customized calendars.