On average, a minute of a WhatsApp call consumes about 0.15-0.20 MB (megabytes) of data for voice calls [1]. However, the actual data usage can vary based on factors such as the quality of the call, network conditions, and whether it is a voice or video call.

To reduce data consumption on WhatsApp voice and video calls, you can follow these steps:

Steps to reduce data consumption on WhatsApp voice calls:

1. Open WhatsApp and click on the three vertical dots at the top-right corner of the screen.
2. Tap on the option "Settings" from the drop-down menu.
3. Next, click on the option "Storage and Data".
4. Now, enable the option "Use less data for calls" by tapping on the toggle switch in front of the option [2].

It's important to note that reducing data usage may affect the call quality or picture quality if it is a video call.

Learn more:

1. about 0.15-0.20 MB
2. WhatsApp tip: Here’s how you can reduce data usage on WhatsApp voice and video calls - India Today
3. How Much Data Does a WhatsApp Call Use? | ITGeared