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Glossary

ALCU Fees

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Last updated: 2026-09-28 16:39:09

AI-Translated & Reviewed

The performance capacity unit, ALB Load Balancer Capacity Unit (ALCU), measures the performance metrics involved when Application Load Balancer (ALB) handles workloads. This document describes the ALCU billing details in pay-as-you-go billing mode.
ALCU Measurement Metrics
In pay-as-you-go billing mode, the following 4 ALCU measurement metrics are included: Number of New Connections, Number of Concurrent Connections, Processed Traffic, and Number of Rule Assessments. The performance metrics for a single ALCU are as follows:
Metric Name
Description
ALCU Coefficient
Number of Hourly ALCUs
Number of New Connections
Number of new connections per second
25
Number of ALCUs = Average number of new connections per second within an hour/ALCU coefficient
Number of Concurrent Connections
Number of concurrent connections per minute
3,000
Number of ALCUs = Average number of concurrent connections per minute within an hour/ALCU coefficient
Processed Traffic
Number of bytes processed by ALB per hour, including inbound and outbound traffic (in GB)
1
Number of ALCUs = Total traffic within an hour/ALCU coefficient
Number of Rule Assessments
Queries per second (QPS) multiplied by the number of forwarding rules processed by ALB. The first 25 rules are free of charge.
If the number of processed rules is greater than 25, the number of rule assessments is calculated by using the following formula: QPS x (Number of processed rules − 25).
If the number of processed rules is less than or equal to 25, the number of rule assessments is equal to the value of QPS.
1,000
Number of ALCUs = Average number of rule assessments per second within an hour/ALCU coefficient
The ALCU billing cycle is 1 hour. The logic for calculating the number of ALCUs consumed by ALB within 1 hour is as follows: First, calculate the number of ALCUs per protocol for the instance from the preceding 4 metric dimensions. Then, use the metric with the highest ALCU consumption as the number of ALCUs to be billed for that hour.
Calculation Formula:
Hourly ALCU fee = Max(Number of ALCUs for the Number of New Connections metric, Number of ALCUs for the Number of Concurrent Connections metric, Number of ALCUs for the Processed Traffic metric, Number of ALCUs for the Number of Rule Assessments metric) x ALCU unit price
Pricing Details
Region
ALCU Unit Price (USD/Unit)
All regions
0.007
Billing Examples
Assume that your ALB instance has an average of 100 new connections per second, each connection lasts for 3 minutes, clients send an average of 400 requests per second, the total data processed by ALB for requests and responses is 1,000 KB per second, and you have configured 30 forwarding rules for ALB to route client requests. In this case, the number of ALCUs for each metric is calculated as follows:
Metric Name
Example
ALCU Coefficient
Number of ALCUs
Number of New Connections (per second)
The ALB instance has an average of 100 new connections per second.
25
Number of ALCUs = 100/25 = 4
Number of Concurrent Connections (per minute)
A total of 100 new connections are established per second, resulting in 6,000 new connections per minute. If each new connection lasts for 3 minutes, the maximum number of concurrent connections per minute is calculated by using the following formula: 6,000 x 3 = 18,000.
3,000
Number of ALCUs = 18,000/3,000 = 6
Processed Traffic (per hour)
An average of 1,000 KB of data is processed per second, which is equivalent to 3.6 GB of data per hour.
1
Number of ALCUs = 3.6/1 = 3.6
Number of Rule Assessments (per second)
An average of 400 requests are received per second, 30 forwarding rules (exceeding the free quota of 25 forwarding rules) are configured, the number of billable rule assessments generated per second is calculated by using the following formula: (30 − 25) x 400 = 2,000.
1,000
Number of ALCUs = 2,000/1,000 = 2
In this example, the metric dimension with the highest ALCU consumption (6 ALCUs) is Number of Concurrent Connections. Therefore, the fee for the ALCUs is calculated based on the number of ALCUs corresponding to concurrent connections:
Hourly ALCU fee = USD 0.007/unit x 6 ALCUs = USD 0.042
References
Billing Overview
Instance Fees
Public Network Traffic Fees

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Metric Name	Description	ALCU Coefficient	Number of Hourly ALCUs
Number of New Connections	Number of new connections per second	25	Number of ALCUs = Average number of new connections per second within an hour/ALCU coefficient
Number of Concurrent Connections	Number of concurrent connections per minute	3,000	Number of ALCUs = Average number of concurrent connections per minute within an hour/ALCU coefficient
Processed Traffic	Number of bytes processed by ALB per hour, including inbound and outbound traffic (in GB)	1	Number of ALCUs = Total traffic within an hour/ALCU coefficient
Number of Rule Assessments	Queries per second (QPS) multiplied by the number of forwarding rules processed by ALB. The first 25 rules are free of charge. If the number of processed rules is greater than 25, the number of rule assessments is calculated by using the following formula: QPS x (Number of processed rules − 25). If the number of processed rules is less than or equal to 25, the number of rule assessments is equal to the value of QPS.	1,000	Number of ALCUs = Average number of rule assessments per second within an hour/ALCU coefficient

Metric Name	Example	ALCU Coefficient	Number of ALCUs
Number of New Connections (per second)	The ALB instance has an average of 100 new connections per second.	25	Number of ALCUs = 100/25 = 4
Number of Concurrent Connections (per minute)	A total of 100 new connections are established per second, resulting in 6,000 new connections per minute. If each new connection lasts for 3 minutes, the maximum number of concurrent connections per minute is calculated by using the following formula: 6,000 x 3 = 18,000.	3,000	Number of ALCUs = 18,000/3,000 = 6
Processed Traffic (per hour)	An average of 1,000 KB of data is processed per second, which is equivalent to 3.6 GB of data per hour.	1	Number of ALCUs = 3.6/1 = 3.6
Number of Rule Assessments (per second)	An average of 400 requests are received per second, 30 forwarding rules (exceeding the free quota of 25 forwarding rules) are configured, the number of billable rule assessments generated per second is calculated by using the following formula: (30 − 25) x 400 = 2,000.	1,000	Number of ALCUs = 2,000/1,000 = 2

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ALCU Fees

ALCU Measurement Metrics

Pricing Details

Billing Examples

References

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