Choose a conversion direction and enter a duration to convert Mars sols and Earth days, or Mars years and Earth years. These approximate conversions retain the rounded factors 1.02749 Earth days per sol and 1.88 Earth years per Mars year.

Approximate duration conversions: 1 sol = 1.02749 Earth days; 1 Mars year = 1.88 Earth years.

Sol presets

Mars Days to Earth Days Formula

The following formula is used to convert Mars days to Earth days and vice versa.

E = M × 1.02749

Variables:

  • E is the number of Earth days
  • M is the number of Mars days
  • 1.02749 is the conversion factor from Mars days to Earth days

To convert Mars days to Earth days, multiply the number of Mars days by the conversion factor 1.02749. To convert Earth days to Mars days, divide the number of Earth days by the same conversion factor.

Mars Days (sol) to Earth Days Conversion Table (1 sol = 1.02749 Earth days)
Mars Days (sol) Earth Days
0.250.2569
0.50.5137
0.750.7706
11.0275
22.0550
33.0825
55.1375
77.1924
1010.2749
1414.3849
2121.5773
2828.7697
3030.8247
4546.2371
6061.6494
9092.4741
120123.2988
180184.9482
365375.0339
668.6686.9798
*Uses 1 Mars day (sol) = 1.02749 Earth days.

What is a Mars Day?

A Mars day, also known as a “sol,” is a solar day: the mean interval between successive noons on Mars. A sol is approximately 24 hours, 39 minutes, and 35.244 seconds, which is slightly longer than an Earth day. Understanding the length of a Mars day is crucial for planning missions and activities on the Martian surface, as it affects everything from the operation of solar-powered equipment to the scheduling of communication windows with Earth.

How to Calculate Mars Days to Earth Days?

The following steps outline how to calculate Mars days to Earth days.

  1. First, determine the number of Mars days (M).
  2. Next, use the conversion factor to calculate the equivalent number of Earth days (E).
  3. Use the formula E = M * 1.02749 to find the number of Earth days.
  4. Alternatively, to convert Earth days to Mars days, use the formula M = E / 1.02749.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Number of Mars days (M) = 10

Using the formula E = M * 1.02749, the equivalent number of Earth days (E) would be:

E = 10 * 1.02749 = 10.2749 Earth days