Mercury Retrograde Timer Calculator
Find if Mercury is currently retrograde, how many days remain, and when the next retrograde period begins.
Mercury stations retrograde 3-4 times per year.
Mercury retrograde is an astrological phenomenon that occurs approximately three times per year. From Earth’s perspective, Mercury appears to move backward through the zodiac for about 3 weeks at a time. This is an optical illusion caused by the different orbital speeds of Earth and Mercury around the Sun — Mercury is not actually moving backward.
How often does it happen? Mercury goes retrograde three times in most years, each lasting roughly 19 to 24 days. In total, Mercury is retrograde for about 60 to 66 days per year, roughly 18% of the time.
Why the dates never repeat year to year This is the part almost every retrograde calendar online gets wrong. Mercury’s synodic period, the time between one retrograde and the next, is 115.88 days. Three of those come to 347.6 days, which is about 18 days short of a calendar year. So each year’s retrogrades land roughly 18 days earlier than the year before, and after about four years the whole pattern has walked backward through a full season. If you ever see a site listing the same calendar dates two years running, it copied the table and changed the year.
Mercury retrograde periods 2025 to 2028:
- March 15 to April 7, 2025 (Aries / Pisces)
- July 18 to August 11, 2025 (Leo / Cancer)
- November 9 to November 29, 2025 (Sagittarius / Scorpio)
- February 26 to March 20, 2026 (Pisces)
- June 29 to July 23, 2026 (Leo / Cancer)
- October 24 to November 13, 2026 (Scorpio)
- February 9 to March 3, 2027 (Pisces / Aquarius)
- June 10 to July 4, 2027 (Cancer / Gemini)
- October 7 to October 28, 2027 (Scorpio / Libra)
- January 24 to February 14, 2028 (Aquarius)
- May 21 to June 14, 2028 (Gemini)
- September 19 to October 11, 2028 (Libra / Virgo)
Treat these as accurate to within a day. Mercury stations at a specific hour, and whether that hour falls on one date or the next depends on your timezone.
What astrologers say to avoid during retrograde:
- Signing contracts or making major decisions
- Launching new businesses or projects
- Buying electronics or vehicles
- Starting new relationships
What astrologers say is favored:
- Reviewing, revising, and reflecting
- Reconnecting with old friends
- Finishing projects already in progress
- Re-evaluating plans and goals
Pre-shadow and post-shadow periods: The effects are said to begin about 2 weeks before the official retrograde (pre-shadow) and linger about 2 weeks after (post-shadow), sometimes called the “retroshade” period.
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This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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