What pricing does this calculator use?

It uses the standard AWS Lambda pricing: $0.20 per 1 million requests and $0.0000166667 per GB-second of compute, matching the us-east-1 on-demand rate as of 2025. Provisioned concurrency and VPC data transfer costs are not included.

What is the AWS Lambda free tier?

AWS provides 1 million free requests and 400,000 GB-seconds of compute per month, every month, for all Lambda functions in your account. This calculator deducts the free tier before computing your bill.

How is GB-seconds calculated?

GB-seconds = (memory in MB / 1024) × (duration in ms / 1000) × number of invocations. AWS rounds duration up to the nearest 1 ms.

Does this include data transfer costs?

Yes. This estimate applies $0.09 per GB after the first 100 GB of internet data transfer out per month, aggregated across eligible AWS services and Regions. Actual transfer pricing varies by Region and destination; internal traffic is not modeled.

Why does changing memory size affect cost so much?

Compute cost is proportional to memory. A 512 MB function costs 4x more per second than a 128 MB function. However, higher memory often reduces duration, so the total cost relationship is not always linear.

Are ARM/Graviton Lambda functions cheaper?

Yes — ARM (Graviton2) functions cost about 20% less per GB-second ($0.0000133334 vs $0.0000166667). This calculator uses x86 pricing; multiply your compute cost by 0.80 to estimate ARM savings.

AWS Lambda Cost Calculator

Estimate your monthly AWS Lambda bill by entering request count, duration, memory size, and data transfer.

Function Parameters

Monthly Invocations

Number of times your function is called per month.

Average Duration (ms)

Average execution time per invocation in milliseconds.

Memory Allocation (MB)

Lambda allocates CPU proportionally to memory.

Outbound Data Transfer (GB/month)

Data sent to the internet. First 100 GB/month is free across eligible AWS services and Regions.

Apply AWS Free Tier

Estimated Monthly Cost

Fill in the parameters and click Calculate.

AWS Lambda Pricing Reference (x86, us-east-1)

Request charge

$0.20 / 1M requests

Free tier: 1M req/month

Compute charge

$0.0000166667 / GB-s

Free tier: 400K GB-s/month

Data transfer out

$0.09 / GB

Free tier: 100 GB/month (aggregated)

ARM/Graviton2

$0.0000133334 / GB-s

~20% cheaper than x86

Summary

This calculator estimates your monthly AWS Lambda bill using the standard on-demand pricing for x86 functions. Enter your invocation count, average duration, memory size, and outbound data transfer to see a detailed cost breakdown including free-tier deductions. Results update instantly as you adjust inputs.

How it works

Enter the number of Lambda function invocations per month.
Set the average execution duration in milliseconds.
Choose your memory allocation (128 MB to 10,240 MB).
Optionally enter outbound data transfer in GB.
The calculator applies current AWS free tier deductions and shows the billable cost breakdown.

Use cases

Estimate costs before deploying a new Lambda-based API.
Compare cost impact of increasing or decreasing memory allocation.
Budget for a scheduled Lambda job running millions of times per month.
Understand how free tier affects small or medium workloads.
Evaluate serverless vs. EC2/container costs for your use case.
Present infrastructure cost estimates to stakeholders.

Frequently Asked Questions

Last updated: 2026-06-04 · Reviewed by Nham Vu