Lunar Age Calculator
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How many days since the last new moon? Lunar age in days for any calendar date.
Date
Lunar age
23.7 days
Days since last new moon on 2026-08-07
- Age since new moon
- 23.7 days
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Lunar age in days
Lunar age measures time elapsed since the last new moon, from 0 days at new moon to about 29.5 days just before the next new moon. Gardeners, fishers, and folklore calendars sometimes reference lunar age even though scientific outcomes vary.
This calculator derives age from the same synodic-month model as our moon phase tool — it is a consistent estimate, not a measured observation from your backyard. Age near 14–15 days corresponds roughly to full moon in the model.
Example: a lunar age of 7 days often aligns with first quarter in simplified charts; age 22 days often aligns with last quarter. Pair with the moon phase calculator for the named phase and illumination.
Official sources
Rates and formulas in this calculator reference the documentation below. Confirm current numbers on the source site before relying on them. Links do not imply endorsement by those organizations of Calcometry or this tool.
Common questions
What is the maximum lunar age?
One synodic month is about 29.53 days, so age resets near 29–30 days at the next new moon. Values are rounded to one decimal place.
Is lunar age used in medicine or surgery planning?
Some folk traditions mention moon age, but there is no reliable clinical evidence tying it to outcomes. Treat this as cultural curiosity, not medical guidance.