Azure Functions Cost Calculator

Price the Functions consumption plan in GB-seconds and executions, including the monthly free grants.

About Azure Functions Cost Calculator

The consumption plan charges two meters: resource consumption in GB-seconds, where memory is rounded up to 128 MB blocks and duration has a 100 ms floor, and a flat charge per million executions. Both meters have a monthly free grant, so small workloads genuinely cost nothing while long-running or memory-hungry functions are dominated by the GB-second line. The 100 ms floor and the 128 MB rounding mean thousands of trivial 5 ms functions cost the same as 100 ms ones, so batching work per invocation is usually cheaper than fanning out — check the current GB-second and execution prices in the Azure pricing calculator, and note that Premium and Flex Consumption plans bill differently.

Formula

Azure Functions Cost

GB-second: One gigabyte of memory held for one second
free grant: Monthly allowance of 400,000 GB-seconds and 1 million executions
billed duration: Execution time with a 100 ms floor applied

Worked example

With the default values below, Azure Functions Cost Calculator returns Monthly Cost of $10.40. Change any input above and every figure here is recalculated in your browser.

Inputs used

Executions per monthaccepts 0–100,000 millions: 5 millions
Average execution timeaccepts 1–600,000 ms: 400 ms
Memory used per executionaccepts 128–14,336 MB: 512 MB
Price per GB-secondaccepts 0–0.01 USD: 0.000016 USD
Price per million executionsaccepts 0–100 USD: 0.2 USD
Free GB-seconds per monthaccepts 0–10,000,000 GB-s: 400,000 GB-s
Free executions per monthaccepts 0–100 millions: 1 millions

Results

Monthly Cost: $10.40
Resource Consumption: 1,000,000 GB-s
Billable GB-seconds: 600,000 GB-s
Resource Charge: $9.60
Execution Charge: $0.80
Cost per Million Executions: $2.08

Step by step

1Values used
2Azure Functions Cost
3Monthly Cost= 10.40
4Resource Consumption= 1,000,000 GB-s
5Billable GB-seconds= 600,000 GB-s
6Resource Charge= 9.60
7Execution Charge= 0.80
8Cost per Million Executions= 2.08

Assumptions and limits

The result is derived only from the 7 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Azure Functions Cost calculated?

GB-seconds = executions × billed duration (min 100 ms) × memory rounded up to 128 MB blocks ÷ 1024; cost = (GB-s − 400,000 free) × GB-s price + (executions − 1 M free) ÷ 1 M × execution price. The consumption plan charges two meters: resource consumption in GB-seconds, where memory is rounded up to 128 MB blocks and duration has a 100 ms floor, and a flat charge per million executions. Both meters have a monthly free grant, so small workloads genuinely cost nothing while long-running or memory-hungry functions are dominated by the GB-second line.

Why does Azure Functions Cost matter?

The 100 ms floor and the 128 MB rounding mean thousands of trivial 5 ms functions cost the same as 100 ms ones, so batching work per invocation is usually cheaper than fanning out — check the current GB-second and execution prices in the Azure pricing calculator, and note that Premium and Flex Consumption plans bill differently.

What values do I need to enter?

This calculator takes 7 inputs: Executions per month, Average execution time, Memory used per execution, Price per GB-second, Price per million executions, Free GB-seconds per month, Free executions per month. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.