You are charged for using Virtual Private Cloud (VPC) NAT gateways. This topic describes the billing method and billable items of VPC NAT gateways.
Billable items
The following figure shows the billable items of VPC NAT gateways.
Billing overview
Billing of VPC NAT gateways
Item  Description 
Billing methods  VPC NAT gateways support the payasyougo billing method. The payasyougo billing method allows you to use resources before you pay for them. Bills are generated and fees are deducted after each billing cycle. 
Billing cycles and bill generation time  VPC NAT gateways are billed based on resource usage on an hourly basis. Bills are generally generated 1 hour after a billing cycle ends. The time when bills are generated is determined by the system. 
Billable items and billing formula  The billable items of VPC NAT gateways consist of instances and Capacity Units (CUs).

After you delete a VPC NAT gateway, the billing is immediately stopped. For more information about how to delete a VPC NAT gateway, see Delete a VPC NAT gateway.
Instance fees
You are charged instance fees for VPC NAT gateways on an hourly basis. Fees are calculated and bills are generated on an hourly basis. If you use a VPC NAT gateway for less than 1 hour, the usage duration is rounded up to 1 hour. Billing begins when the instance is created and ends when the instance is released.
Instance fee = Unit price(USD/hour) × Usage duration (hour)
The following table lists the unit prices of VPC NAT gateways.
The prices in the following table are for reference only. The prices on the buy page shall prevail.
Region  Unit price(USD/hour) 
China (Hangzhou), China (Shanghai), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), China (Ulanqab), China (Shenzhen), China (Heyuan), China (Guangzhou), and China (Chengdu)  0.034 
China (Hong Kong), Japan (Tokyo), South Korea (Seoul), Singapore, Australia (Sydney), Malaysia (Kuala Lumpur), Indonesia (Jakarta), Philippines (Manila), Thailand (Bangkok), India (Mumbai) Closing Down, Germany (Frankfurt), UK (London), US (Silicon Valley), US (Virginia), and UAE (Dubai)  0.043 
CU fees
You are charged CU fees for VPC NAT gateways on an hourly basis. Fees are calculated and bills are generated on an hourly basis. If you use a VPC NAT gateway for less than 1 hour, the usage duration is rounded up to 1 hour.
CU fee per hour = CU unit price (USD/CU) × Number of CUs consumed per hour
Number of CUs consumed per hour = Max{Number of CUs based on new connections per hour, Number of CUs based on concurrent connections per hour, Number of CUs based on data transfer per hour}
CUs are used to measure the performance of VPC NAT gateways when VPC NAT gateways process traffic. The following table describes the metrics.
Metric  Unit  Default specification  CU coefficient  How the number of CUs per hour is calculated 
Connections per second (CPS)  Seconds  100,000  1,000  The system collects all CPS values within a billing cycle and then divides the highest CPS value by the CU coefficient to calculate the number of CUs. The number of CUs based on CPS is calculated by using the following formula:

Concurrent connections (CONNS)  Minutes  2,000,000  10,000  The system collects all CONNS values within a billing cycle and then divides the highest CONNS value by the CU coefficient to calculate the number of CUs. The number of CUs based on CONNS is calculated by using the following formula:

Data transfer (bytes)  Hours  5 Gbit/s to 15 Gbit/s (automatic scaling)  1 GB  The system collects the total amount of data transfer including the inbound and outbound traffic within a billing cycle. Then, the system divides the total amount by the CU coefficient to calculate the number of CUs. Note The amount of outbound and inbound network traffic collected by the system is equal to the amount of network traffic to be processed by a NAT gateway. The number of CUs based on data transfer is calculated by using the following formula:

The following table describes the unit prices of CUs for VPC NAT gateways.
The prices in the following table are for reference only. The prices on the buy page shall prevail.
Region  CU unit price (USD/hour) 
China (Hangzhou), China (Shanghai), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), China (Ulanqab), China (Shenzhen), China (Heyuan), China (Guangzhou), and China (Chengdu)  0.034 
China (Hong Kong), Japan (Tokyo), South Korea (Seoul), Singapore, Australia (Sydney), Malaysia (Kuala Lumpur), Indonesia (Jakarta), Philippines (Manila), Thailand (Bangkok), India (Mumbai) Closing Down, Germany (Frankfurt), UK (London), US (Silicon Valley), US (Virginia), and UAE (Dubai)  0.043 
Example of CU billing
You created three VPC NAT gateways in the Germany (Frankfurt) region at 08:10:00 (UTC+8) on November 8, 2021. Then, you released them at 08:50:00 (UTC+8) on November 8, 2021. The following table describes the highest CPS value, the highest CONNS value, and the total amount of data transfer of the three VPC NAT gateways from 08:10:00 (UTC+8) to 08:50:00 (UTC+8).
Table 1. Highest metric values
Metrics  NAT Gateway 1  NAT Gateway 2  NAT Gateway 3 
Highest CPS value (connections/second)  1100  32  0 
Highest CONNS value (connections/minute)  20000  8  0 
Total amount of data transfer (GB/hour)  3.5  0.0056  0 
The following table describes the numbers of CUs based on new connections, concurrent connections, and data transfer, and the CU fees of the NAT gateways.
Table 2. Number of CUs and CU fees
Number of CUs  NAT Gateway 1  NAT Gateway 2  NAT Gateway 3 
Number of CUs based on CPS  1100÷1000=1.1  32÷1000=0.032  0 
Number of CUs based on CONNS  20000÷10000=2  8÷10000=0.0008  0 
Number of CUs based on data transfer  3.5÷1=3.5  0.0056÷1=0.0056  0 
CU fee (USD)  3.5×0.043=0.1505  0.032×0.043=0.001376  0 