Conversion Note: 1 Common Year = 365 days | 1 Leap Year = 366 days | 1 Astronomical Year ≈ 365.2422 days

Days to Years Converter

Accurately convert between days and years with 4 decimal places precision. Supports common year (365 days) and leap year (366 days) calculations for age tracking, project planning, and time management.

Currently using Common Year (365 days) | Default: 4 Decimal Places

Leap years occur every 4 years (except years divisible by 100 but not 400)

days

Enter any non-negative number (e.g., 365, 182.5, 90)

years

Precision: 4 Decimal Places | Formula: years = days ÷ 365

Quick Conversion Shortcuts

Common Conversions (Common Year: 365 days)

Days to Years Conversion Information

Conversion Formulas

Common Year (365 days)

Years = Days ÷ 365

Days = Years × 365

Leap Year (366 days)

Years = Days ÷ 366

Days = Years × 366

What is a Year?

A year is a unit of time based on the Earth's revolution around the Sun. There are several types:

  • Common Year: 365 days (used in most years)
  • Leap Year: 366 days (every 4 years, adding February 29)
  • Tropical Year: ~365.2422 days (astronomical measurement)

How to Use This Converter

  1. Enter a value in the input field (either days or years)
  2. Select between Common Year (365 days) or Leap Year (366 days) conversion
  3. Click "Convert Time" to see the result
  4. Use "Years to Days" to switch conversion direction
  5. Adjust decimal precision using the buttons above the input fields

Frequently Asked Questions

The conversion accuracy depends on the year type selected. For common years (365 days), the conversion is accurate to within 1 day per year. For leap years (366 days), it's accurate for years divisible by 4 (with exceptions for century years not divisible by 400). Our calculator provides results with up to 4 decimal places for precise measurements.

Use leap year conversion (366 days) when your calculation period includes February 29 of a leap year. Leap years occur every 4 years, except for years divisible by 100 that are not also divisible by 400. Examples of leap years: 2000, 2004, 2008, 2012, 2016, 2020, 2024.

In 10 years, there are typically 3652 or 3653 days, depending on how many leap years are included. Using our calculator:

  • 10 common years = 3650 days
  • 10 years with 2-3 leap years = 3652-3653 days

For precise calculations, use the "Years to Days" conversion mode and account for specific leap years in your period.

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