Cancel your NumberGuru subscription by mail
NumberGuru takes cancellation requests by mailed letter, so a dated certified-mail letter is the record that counts. Our database has NumberGuru's mailing address in New York, United States.
Let Postbye cancel NumberGuru for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Money-back guarantee within 10 business days.
Postbye is not affiliated with NumberGuru.
- 4.8 from 2,931 reviews
- 2 NumberGuru cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel NumberGuru by mail
Collect the details you need
You will need the name and email on the account and, if you have one, an account or customer number. Use exactly the details NumberGuru holds, so the request can be matched to your account.
Draft the request
Your Postbye letter to NumberGuru asks for three things: the account closed, no further charges and a written confirmation, all under “Subject: Subscription termination – NumberGuru”. It comes from our English template.
Post the letter
Take the letter to the post office and ask for certified delivery to 10018 New York. Keep the tracking number it gives you.
Save the tracking record
It shows the date NumberGuru received your letter. Check your next statement: no NumberGuru charge should post after the cancellation date.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your NumberGuru cancellation letter goes
The mailing address we hold for NumberGuru is 48 West 38th Street, New York, NY 10018.
New York is in New York (ZIP 10018), a domestic address for certified mail within the United States.
The letter is addressed “To Whom It May Concern,” and its details block uses the labels Name, Address and E-mail.
Prefer to write it yourself? Use our letter template
Every address we hold for NumberGuru, with the envelope wording
Before you cancel NumberGuru, check these
- Check your next statement: no charge should appear after the cancellation date.
- Look for annual or multi-month plans. A plan paid in advance usually runs to the end of the period you paid for.
- Write well before the next billing date. A request that arrives after it can leave one more charge on your statement.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel NumberGuru for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
How cancelling by mail works
Subscriptions renew automatically, and a written request is the clearest record that you asked to stop it before the next billing date.
A letter is the formal route: it states the request in writing, carries a date and, sent by certified mail, comes with proof of delivery.
NumberGuru cancellation at a glance
- How NumberGuru accepts cancellations
- By mailed letter
- Mailing address on file
- NumberGuru 48 West 38th Street New York, NY 10018
- Country
- United States
- Letter language
- English (template en)
- Added to the database
- April 30, 2026
- Data last checked
