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Moon Phase Calculator — Any Date, Phase & Illumination

Any date's phase, illumination and the next new and full moons.

Quick answer: Get any date's moon phase with illumination percentage, emoji and the next new and full moon dates — simple sky math that works without internet.

How to use

  1. Pick a date — it defaults to today.
  2. Press Get moon phase.
  3. Read the phase name, emoji and illumination percentage.
  4. Note the next new and full moon dates for planning.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

The moon repeats itself every 29.53058867 days — the mean synodic month — and that single number powers this page. Counting from the reference new moon of January 6, 2000 (18:14 UTC), the tool converts any date you pick into a moon age, which maps to one of eight phases with its emoji, an illumination percentage and the approximate dates of the next new and full moons. It is deliberately simple sky math rather than a full ephemeris: expect accuracy within roughly a day, which is perfect for planning a stargazing night, a moonlit walk or a lesson plan. The date box defaults to today; past and future dates work the same. No internet connection is needed after the page loads, and nothing about your queries ever leaves your device.

FAQ

How accurate is the phase?
Within roughly a day. The page uses the mean synodic month (29.53058867 days) from a reference new moon; real lunar timing wobbles slightly around that average.
Why is my illumination % different from an astronomy app?
Apps often use precise ephemeris math; this page uses simple mean-cycle math by design — close enough for planning, light to compute, works offline.
Can I check past dates?
Yes — any date works, past or future: birthdays, eclipse nights, or the night you were born.
What are the 8 phases shown?
New, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, last quarter and waning crescent — one per eighth of the cycle.
Does it need the internet?
No. Once the page is loaded, all math runs on your device and nothing is uploaded.

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The complete moon phase calculator guide

Prefer the long version — a worked example, the mistakes people actually make, and answers to real questions? The blog guide Moon Phase Calculator — Complete Guide, Mistakes & FAQ covers all of it step by step.

Browse the collection: Faith & Lunar — All 4 Free Online Tools