There's no magic number. The rule is: ask only what's necessary.
Usually Required
- Name
- Phone (if needed)
- Selected time
Qualification Fields
Add when the answer changes:
- Routing
- Eligibility
- Service type
- Duration
Fields That Can Wait
- Detailed questionnaires
- Company information
- Project history
Collect after booking if possible.
Progressive Disclosure
Show relevant fields based on previous answers.
Mobile Consideration
Long forms feel longer on phones.
Measure Impact
If analytics shows drop-off at a field, investigate.
Bookux
Bookux designs booking forms that collect what matters without losing conversions.
Related: Reduce Booking Drop-Off · Multi-Step Booking Flow