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About this tool
Compute Azure Functions Consumption plan cost from executions and GB-seconds, with the free grants and an EP1 Premium comparison.
This calculator computes the monthly Azure Functions Consumption plan bill as executions × $0.20 per million plus GB-seconds × $0.000016, after the free monthly grants of 1 million executions and 400,000 GB-seconds (East US list prices). It applies Azure's real billing granularity — memory rounded up to 128 MB, a 100 ms minimum per execution — and compares the result against one always-on EP1 Premium instance so teams can see when the serverless plan stops being the cheap option.
Open Azure Functions Cost Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Applies the 128 MB memory rounding and 100 ms minimum that inflate naive estimates.
The 1M execution and 400,000 GB-second monthly grants are subtracted before charging.
Shows side by side whether Consumption or one EP1 instance is cheaper at your volume.
On two meters: $0.20 per million executions and $0.000016 per GB-second of execution time in East US, after free monthly grants of 1 million executions and 400,000 GB-seconds. GB-seconds are memory (rounded up to the nearest 128 MB) multiplied by duration (minimum 100 ms per execution).
One GB-second is one gigabyte of memory held for one second. A function using 512 MB for 500 ms consumes 0.5 GB × 0.5 s = 0.25 GB-seconds per execution, so 5 million such executions is 1.25 million GB-seconds — 850,000 of them billable after the 400,000 free grant, costing $13.60.
Effectively yes: the monthly grants cover 1 million executions and 400,000 GB-seconds, so a lightweight 128 MB function running 100 ms per call can execute a million times for $0. You still pay separately for the required storage account and any bandwidth.
When sustained usage exceeds the cost of a fixed instance — the smallest EP1 (1 vCPU, 3.5 GB) lists at roughly $158/month in East US. Heavy workloads, such as around 100 million one-second 1 GB executions costing about $1,600 on Consumption, are far cheaper on Premium, which also removes cold starts and the 1,536 MB memory cap.
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