AWS Lambda Cost Calculator
Estimate your monthly Lambda bill. Enter invocations, duration, memory, and data transfer — get a full cost breakdown with EC2 comparison.
Lambda Configuration
Monthly Cost Breakdown
vs EC2 t3.micro (always-on)
Key Metrics
GB-seconds/month
0
Cost per 1K invocations
$0.000
Free tier applied
$0.00 saved
Effective $/request
$0.00000
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See what's included → Browse all deals →Frequently Asked Questions
How does AWS Lambda pricing work?▼
Lambda charges for two things: the number of requests ($0.20 per 1M requests) and compute duration ($0.0000166667 per GB-second, billed in 1ms increments). The free tier includes 1M requests and 400,000 GB-seconds per month. Duration is calculated as ceil(duration/1ms) × memory_GB × $0.0000166667.
What is a GB-second?▼
A GB-second is 1 GB of memory running for 1 second. If your function uses 512 MB and runs for 2 seconds, that's 0.5 GB × 2s = 1 GB-second. With 128 MB and 100ms runtime, it's 0.128 GB × 0.1s = 0.0128 GB-seconds. Lambda bills per millisecond so you pay for exact usage.
When does Lambda beat EC2 t3.micro?▼
A t3.micro on-demand costs ~$8.47/month. Lambda becomes more expensive than a 24/7 t3.micro when you exceed roughly 400M invocations at 100ms/128MB or 50M invocations at 500ms/512MB. Lambda wins for spiky or low-volume workloads; EC2 wins for sustained high-throughput.
What about data transfer costs?▼
Lambda charges $0.09/GB for data transferred out to the internet. Transfers within the same AWS region (to S3, DynamoDB, etc.) are free. Transfers to other AWS regions cost $0.02/GB. Our calculator includes outbound internet transfer costs.
Does Lambda have a free tier?▼
Yes — the Lambda free tier is perpetual (not just 12 months): 1M free requests per month and 400,000 GB-seconds per month. For a 128 MB function, that's about 3.2 million seconds of compute time per month for free.