Does it cost money to become Muslim?

Islam has no entry fee

Becoming Muslim means sincerely believing and declaring that there is no god but Allah and that Muhammad ﷺ is His Messenger. That's it. There's no baptism-style ceremony to book, no clergy you must pay, and no church-style membership. You could say your shahada alone in your room and it would count before Allah.

Possible costs that are optional

• A conversion certificate. Most mosques issue one for free; a few charge a small fee to cover printing or registration. You usually only need it for Hajj, Umrah or a Muslim marriage abroad. See Do I need a certificate to prove I'm Muslim?
• Learning materials. Books, a prayer mat or a scarf are nice to have but not required. Mosques and convert groups often give them away as gifts.
• Classes. Many new-Muslim courses are free. Paid courses exist, but you never have to pay to learn the basics.

Physical requirements like circumcision aren't a condition either, so there's no medical bill involved. See Do I need to be circumcised to become Muslim?

What about money after becoming Muslim?

Islam does include giving, but it's based on what you can afford:

• Zakat is a yearly 2.5% on savings above a set threshold (nisab), held for a lunar year. If you don't have that much, you pay nothing. See Do I have to pay zakat as a new Muslim?
• Hajj is only required once in a lifetime for those who can afford it.
• Charity (sadaqah) is voluntary, and even a smile counts.

And if you're struggling financially, new Muslims are among those who may receive zakat, not just give it.

Watch out for scams

If anyone online asks you to pay to "register as a Muslim", buy an official shahada, or send money before they'll help you convert, walk away. That's not how Islam works. A real mosque or imam will welcome you for free.