Pre-fill fields/questions

You can pre-fill all the fields/questions on the booking form by using their corresponding identifiers that you can see under Advanced -> Booking Questions.

e.g. for the following field(shown in screenshot), the field would show up as Agree with your rules and its identifier is agreed. So, we would use

agreed as query param name to prefill the field.

This can include the user’s name and email, notes, guests, event location, Reason for reschedule. You can prefill any field added by you as well.

You can add anywhere in the booking flow before the booking form page or in the booking form page itself. Simply add these in the URL and you’re good to go!

Pre-filling booking fields can save a lot of time and speed up processes with filling out these forms, and assist with a smooth integration with your existing website or app.

An example URL with a few prefill fields is given below: https://cal.com/johndoe/book?type=12345&duration=30&email=johndoe%40example.com&notes=Test+Notes You can integrate the prefill-fields with your booking page URL in a similar way.

Pre-filling all fields

A sample booking form with various fields prefilled.

Here is how the fields are setup

Here is the query used to prefill that form above.

name=John Doe&email=[e-mail]&notes=Test Notes&Text=TEXT&number=123&select=Option 1&Multiselect=Option 1&Multiselect=Option 2&guests=b&phone=+91&agreed=true

Fields with multiple values

For questions that accept multiple values, you can pass them multiple times using same identifier. So, e.g. Multiselect has been passed twice and thus it prefills both the values.

Similarly, you can pass guests twice to add one more guest.

Prefilling location

Different type of locations are selected using different values of location. location param value has to be a valid JSON.

Pre-filling Attendee Address

...other-params...&location={"value":"attendeeInPerson","optionValue":"Delhi"}

Pre-selecting Organizer Address in Location

...other-params...&location={"value":"inPerson","optionValue":""}

Note: optionValue will remain empty string for Organizer Address.

If there are multiple organizer addresses(say NYC, London, Paris), then the corresponding prefill codes will be

location={"value":"NYC","optionValue":""}

location={"value":"London","optionValue":""}

location={"value":"Paris","optionValue":""}

Pre-filling Attendee Phone - When chosen as one of the locations

When Attendee Phone is chosen as one of the locations as shown in the screenshot below, you can prefill the phone number by using the location param.

...other-params...&location={"value":"phone","optionValue":"%2B919999999999"}

Note: %2B is encoded form of +

Pre-filling Attendee Phone - When used as a separate booking question

Another way to ask for the attendee phone number is to toggle on the “Phone number” question in the Advanced -> Booking questions section. In that case, the correct approach to prefill the phone number is to use the attendeePhoneNumber param.

...other-params...&attendeePhoneNumber=%2B919999999999

Pre-selecting Link Meeting

...other-params...&location={"value":"link","optionValue":""}

Pre-selecting Organizer’s Default App

For the Organizer’s default conferencing app, you can prefill the location using:

...other-params...&location={"value":"conferencing", "optionValue": ""}

Pre-selecting a video meeting

Specify location param like this

...other-params...&location={"value":"integrations:{VIDEO_APP_IDENTIFIER}","optionValue":""}

App Name	{VIDEO\_APP\_IDENTIFIER}
Zoom	zoom
Cal Video	daily
Office365	office365_video
Facetime	facetime_video
Campfire	campfire_video
Around Video	around_video
Ping	ping_video
Riverside	riverside_video
Signal	signal_video
Sirius	sirius_video
Telegram	telegram_video
Whatsapp	whatsapp_video
Whereby	whereby_video