How many WhatsApp messages can be sent in a day?

How many WhatsApp messages can be sent in a day?

WhatsApp uses a tier-based system (Tier 1 to Tier 4) to allocate sending limits to Business numbers.  The message limits will be allotted as:
  1. In Tier 1, you can send messages to up to 1000 unique contacts per day.
  2. In Tier 2, you can send messages to up to 10,000 unique contacts per day.
  3. In Tier 3, you can send messages to up to 100,000 unique contacts per day.
  4. In Tier 4, you can send messages to an unlimited number of unique contacts per day.
Learn more about WhatsApp sending limits

Note:
If you attempt to send WhatsApp campaigns after reaching the sending limit, your number will be marked as 'Restricted' by WhatsApp, and you'll not be allowed to send messages for the next 24 hours.