The cost per minute will depend on your use case and the call flow that you are building. Our prices are charged based on each leg of the call and any partial minutes (under 60 seconds) are rounded up to the next full minute. See How are Twilio voice and calling product minutes rounded for billing? for more details about rounding.

An example of a call leg could be an inbound call to your Twilio numbers, or an outbound call from your Twilio phone number to other numbers or destinations in the telephone network.

Let's discuss this further below.

• An application that is an inbound call only, such as an IVR or a voicemail application, would only be a single inbound call leg, and therefore, only be charged the inbound per-minute rate for the type of Twilio number receiving the calls. For example, let's say your business has an IVR connected to a US Toll Free Twilio Number and and one of your customers calls and interacts with your IVR for 61 seconds. As of this writing, the current rate for inbound calls to US Toll Free Twilio Numbers is $0.0220 / min, so this call would be charged $0.044 (the 61 seconds is rounded up to 2 minutes).
• An application that is outbound only, such as an appointment reminder application, would also only be a single call leg and charged only the per-minute rate for the outbound call. The price of the outbound call is determined by the destination, and in some cases, the caller ID (i.e. From number). For more details, see our pricing page and Origin-Based Pricing for European destinations.
• An application that is forwarding an inbound call to another phone would have 2 legs: one inbound to Twilio and one outbound to the forwarding number. The per-minute total for this call would then be the sum of the per-minute for inbound calls to Twilio US numbers and the per-minute rate for outbound calls to local US numbers. For more details about how pricing for call forwarding works, see How Much am I Charged for Call Forwarding with Twilio?.

For details about pricing of different types of numbers and countries, see our pricing page or Where Can I See All of Twilio’s Voice Pricing in One Place?.