My Age on Mercury Calculator

Calculate how old you would be on the planet Mercury, closest to the sun, which has the fastest Solar revolution, and second longest rotation [More Below]. Find out if your Mercurian age is older or younger than your Earth age, and view your Mercury milestone birthday chart!

What is my age on Mercury if I'm 28 years old?


Use instead of date of birth

(Optional) Use if calculating for someone else

Related: Venus Age Calculator, Neptune Age Calculator

Note: When you run this calculator the birth date you enter is saved in a temporary (session) cookie so you do not have re-enter if running the calculator multiple times while visiting our site. The cookie is automatically deleted when your browser closes.

Entry Fields

In the Date of Birth fields, enter your birth date, or that of the person for whom you are calculating. If birth date is provided, a birthday age chart of milestone ages is shown comparing when each age occurs on Earth and on Mercury.

If you prefer to enter Years Old instead of Date of Birth, use this field. If both are provided, Years Old takes priority, and birth date is not used. At this time, Years Old should be a whole number (e.g. 30 Years old, not 30.2 or 30.5). The Mercury birthday chart is not displayed for Years Old.

In the Person's Name , enter the name of person whose Mercurian age you are calculating. If calculating how old you would be on Mercury, you can leave this field empty.

About Age on Mercury Calculator

This calculator translates anyone's current Earth age to their age on the planet Mercury, showing whether one is older or younger on Mercury. In addition, if birth date is provided, a birthday chart compares milestone ages (e.g. 1, 18, 21, 25, 40) on Earth and Mercury.

Below you'll find some really interesting info on Mercury, including if one ages faster or slower on Mercury, and how long a day lasts, as compared to here on Earth.

What is Mercury's Position From Sun?

Our Solar system hosts 8 planets*, and Mercury is the closest planet to the Sun. For reference, Earth is third planet from the Sun.

Mercury has just one planet neighbor: Venus, which is about 32 million miles (50 million kilometers) away, though this varies based on where each is in its orbit around the Sun.

*Note that until Pluto was demoted to a dwarf planet in 2006, we were 9 planets!

What is Temperature on Mercury? (Very Hot and Very Cold)

You'd think that being closest to the Sun would make Mercury hotter than Hades, and by day it certainly is, reaching about 800 Fahrenheit (427 Celsius).

But because Mercury has almost no atmosphere, the heat is not trapped within, so at night space travelers are advised to bundle up, since temps can reach -280 Fahrenheit (-173 Celsius). Imagine a night and day spanning 1,000 degrees Fahrenheit.

What is Mercury's Circumference and Diameter?

A planet's circumference is the distance all the way around its equator. Mercury's circumference is about 9,525 miles (15,329 kilometers).

The diameter of a planet is the distance from one side across to the other, measured from the planet's center. Mercury's diameter is 3,032 miles (4,880 kilometers)

Mercury is a little less than 40% the size of Earth, and slightly larger than Earth's moon.

When was Mercury discovered?

Mercury is one of 5 planets that can be viewed without the aid of a telescope, and was observed in ancient times dating back thousands of years. After observing Mercury's fast orbit around the sun, the Romans are said to have named it after Mercury, its messenger god.

Having binoculars or a telescope will certainly facilitate viewing Mercury, but keep in mind it can only be viewed in the East before sunrise, and in the West just after sunset, due to its position between Earth and the Sun.

This means that 6 of the 8 planets were known in ancient times, since ancients observed the other 5 from Earth!. Back then, of course, most ancients believed the other 5 planets orbited a stationary Earth and not the Sun; Copernicus, in the mid 1500s tried to set the record straight, but it took another century or so before this was accepted; Meanwhile, Galileo, inventor of the telescope, spent his last 9 years under house arrest for stating the correct fact.

How long is a year on Mercury?

A year on Mercury is approximately 88 days, which is the length of time it takes for Mercury to orbit the Sun (1 full revolution).

In the 1 year (365.25 days*) it takes Earth to orbit the Sun, speedy Mercury has done so 4.14 times! Wheeeee!

FYI - Mercury, and all other planets in our Solar System, revolve around the Sun in a counter-clockwise motion.

*An Earth year is often shown as 365.25 days, to account for leap years which have 366 days.

How long is day on Mercury?

A day on Mercury is really long, equivalent to 59 days, which is astounding since a Mercurian year only lasts 88 days.

A day is the amount of time for a planet to make a full rotation on its axis. So while Earth makes a full rotation in 1 day, over on Mercury it takes 59 times longer!

Would I Age Faster on Mercury?

You would definitely age faster on Mercury than on Earth. For every Earth year, you'd age 4.1 years on Mercury.

Oddly enough, though, one's day age on Mercury would be a fraction of Earth's day age. As an example, a 65 year old person would be 23,742 days old on Earth, but just 402 Mercurian days old (270 Mercurian years).

Does Mercury Have Moons? Rings?

Mercury does not have any moons, nor does it have any rings.

Does Mercury Have Seasons?

No, it is devoid of seasons, due to its axis of rotation being about 2 degrees, means that it rotates almost upright.

How far is Mercury From the Sun?

Mercury has a mean distance of 36 million miles (58 million kilometers) from the Sun, which is .4 astronomical units (AU). So while Mercury is first planet from the Sun, it's still far!

An astronomical unit (AU) is defined as the distance between the Sun and planet Earth, which is 93 million miles (149 million kilometers).

Has Mercury Been Visited?

Yes, as of 2025, Mercury has been visited by several spacecraft. The first, Nasa's Mariner 10 flew by several times in 1974 and 1975, mapping part of its surface.

Then, in 2011, Nasa's Messenger, a robotic space probe, orbited Mercury from 2011 to 2013, completely mapping its surface. Ultimately, Messenger crashed into Mercury's surface in 2015 (RIP).

BepiColombo, a joint mission between Europe' (ESA) and Japan' (JAXA) space agencies, launched in 2018, and will be doing several fly-bys of Mercury in 2026.

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