Our eyepiece calculator for telescopes, useful magnifications, and observation planning.

What magnifications are right for your telescope? When does the Moon rise or set? These are important questions for every stargazer, but they aren’t always easy to figure out. Our telescope & moon calculator takes care of that for you. Just enter the aperture, focal length, and your eyepieces, and the tool will show you the magnifications and give you additional tips. You’ll also see right away how large the Moon appears in the eyepiece. A lunar calendar provides you with the Moon’s phases as well as rise and set times. Simply enter the values, and you’ll receive recommendations and times.

We wish you clear nights and lots of fun stargazing.

Marcus is a stargazer, content creator and book author. He has been helping people to find the right telescope since 2006, nowadays through his writing and his videos. His book "Mein Weg zu den Sternen für dummies Junior" advises young people, and those who are still young at heart, what they can discover in the sky.

As a coffee junkie, he would love to have his high-end espresso machine by his side under the starry sky.