Cycle calculator
Track where you are today and what comes next. No guessing.
Calculate your cycle in seconds
Enter the first day of your last period and your typical cycle length. We'll show you exactly where you are today and what's coming next.
What this calculator reveals
Know which phase you're in and what it means for your body
See your hormonal phase right now
Your cycle has four distinct phases, each with its own rhythm
Expect what's coming in the days ahead
Energy dips, mood shifts, sleep changes—they're not random
Schedule your life around your biology
Big meetings, workouts, rest days—timing matters
Questions
Everything you need to know about tracking your cycle with Muuse.
The calculator works best when you know your typical cycle length and can identify your last period. Most cycles run 21 to 35 days, but yours might be different—and that's normal. The more data you log in Muuse, the smarter the predictions become.
Yes. If your cycle varies month to month, the calculator uses your average length to estimate phases. Muuse learns your actual pattern over time, so the guidance gets more precise as you track. This is especially useful if you're approaching perimenopause.
Completely. Your cycle data never leaves your phone unless you choose to share it. Muuse was built by a woman who understands what privacy means—your hormonal information belongs to you alone.
You'll see your current phase, how many days until your next period, and what to expect in the days ahead. Download the app to get daily guidance tailored to where you are in your cycle right now.
The calculator gives you the dates. In the app, you can log your cycle and sync predictions with your phone's calendar so you're never caught off guard.
More questions?
Reach out to our support team anytime.
Go deeper with Muuse
This calculator is just the start. Download the app for daily guidance that actually fits your life.
