What is AWS Lambda-GB-Second?

Last updated: April 10, 2025

The duration (per GB-seconds) Lambda code on x86 architectures is executing. Billing starts from function invocation (including cold start time—handler and initialization code) to the time the Lambda code returns or ends. Costs are rounded to the nearest millisecond and vary by memory allocation. Pricing is tiered, the free tier includes 400,000 GB-seconds per month, then there are reduced rates after the first 7.5 billion GB-seconds per month, and the next 11.25 billion. For Compute Savings Plans, a negation amount will show as a negative number.