How to Check Whether a Phone Number Has the Right Number of Digits

A US or Canadian phone number has 10 digits after the +1 country code, a UK mobile has 10 after +44 and an Indian mobile has 10 after +91. Other countries allow other lengths, and some allow several. The phone number length checker shows a country's lengths from its numbering plan, then counts the digits of every number in a list and says how many each one is short or over. It runs in your browser.

How many digits a number should have

Under the North American Numbering Plan every US and Canadian number has 10 digits after +1: a three-digit area code, a three-digit exchange and four more. UK mobiles have 10 digits after +44 (11 with the leading 0 used at home), while some UK landlines have 9. ITU-T Recommendation E.164 caps the whole international number at 15 digits including the country code. The tool's counts come from Google's open-source libphonenumber data and are the digits after the country code, without the trunk 0 used for domestic calls. For the format itself, see our E.164 guide.

Step 1: pick the country

Choose the country you want to know about, or the one most of your list is in. Its lengths for mobiles and landlines show straight away. This matters, because numbers written without a + are read with that default country, so a foreign number can look the wrong length.

Step 2: paste or upload the numbers

Paste numbers, one per line, or upload a CSV. The phone column is found for you. Use up to 500 rows a run without an account, or 25,000 signed in with Google.

Step 3: read each row

Each number gets its digit count, the lengths its country allows, and how many digits it is short or over. Where a country allows several lengths, the off-by count is to the nearest one. Download the full report, only the wrong lengths to fix, or the list without them.

Why lengths go wrong

• A dropped or doubled digit. 415-555-013 is one short; +1 415 555 01322 is one over.
• Leading zeros lost. Excel stores 07911 123456 as 7911123456. Read as a UK number that is still a valid mobile; read as a US number it has 10 digits but is not valid, so the default country matters.
• Country code typed twice or missing. Add or remove codes with the country code tool.

To clean a whole sheet, see cleaning phone numbers in a CSV.

Is the right length a valid number

No. A number can have the right number of digits and still be in a range the plan never allocated, for example a US number whose area code starts with 1. Those rows say Length allowed, but not a valid number. The bulk phone number validator gives the full format check.

What this check cannot do

• It checks length only. A right-length number may still be unallocated, disconnected or reassigned.
• It does not contact any network, so it cannot say who holds a number.
• Numbers without a + code are read with the default country.
• The limit is 500 rows a run without an account and 25,000 signed in.

Verify the emails too

Phone numbers are half of most contact lists; the emails still need checking. Upload your list on the verify page: the first 100 email checks are free with a Google sign-in, no card. Each address comes back valid, risky or invalid with a reason, and nothing is sent to anyone on the list. For larger or recurring lists, see bulk email verification, list cleaning and pricing.

Check your numbers now

Paste them into the phone number length checker.