You can make a call from your Gmail account from your Google Chat list or your email.

Make a call using your Google Chat list

You'll know you're using Google Chat if the green, yellow, or red circle is next to a person's name on the left. If you're using Hangouts in Gmail, you'll see a green or gray circle on the bottom right of the person's photo. Learn more on how to call a phone using Hangouts.

If your voice calls in Google Chat don't work after an upgrade to Chrome 42, you need to use Hangouts to avoid this problem.

1. Log into your Gmail account.
2. In your Google Chat list, click the Call phone icon . 
3. Use your mouse or keyboard’s number pad to dial the number you want to call.
4. Click Call.

If you have a Google Voice number, it will appear on the recipient's caller ID. If you haven't set up a Google Voice number, a generic number will appear to the person you're calling.

Make a call from an email

You can make calls directly from an email you send or receive.

1. When you open an email with a phone number in the text, the number will be blue.
2. Click the phone number in the email.
3. In the dial pad that appears, click Call.