Current Moon Phase Today

See today's moon phase, illumination, and age in real time.

New MoonFull MoonNew Moon

How It Works

The calculator automatically uses today's date to compute the current moon phase and illumination using the synodic month formula.

Formula

Phase = ((julianDay - 2451550.1) / 29.53059) % 1

Frequently Asked Questions

What is the moon phase today?

Use this tool to instantly see today's moon phase, illumination percentage, and how many days old the moon is in its current cycle.

How often does the moon phase change?

The moon phase changes continuously. The full cycle (new moon to new moon) takes approximately 29.53 days.