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Azure App Service Cost Calculator

Cost an App Service plan from its instance rate, autoscale range and average load, with reserved-instance discounts.

About Azure App Service Cost Calculator

An App Service plan bills every running instance by the hour regardless of how many apps are deployed into it, so the cost driver is the instance count that autoscale settles at rather than the number of web apps. Deployment slots run on the same plan instances, which is why a staging slot is free in cost but not in capacity. Plans are routinely left at a fixed high instance count 'for safety', and the gap between the average and the pinned-maximum figure here is the money that autoscaling would return; reserved instances on Premium v3 add another 35–55% but lock the tier for the term, so confirm current rates in the Azure pricing calculator.

Formula

Azure App Service Cost

average instances = min + (max − min) × average load; monthly = average instances × instance rate × commitment factor × 730 + IP-based TLS bindings.

average load
Where in the autoscale band the plan typically sits
commitment factor
Reserved-instance rate as a fraction of pay-as-you-go
instance rate
Hourly price of one worker in the plan's tier

Worked example

With the default values below, Azure App Service Cost Calculator returns Monthly Cost of $401.37. Change any input above and every figure here is recalculated in your browser.

Inputs used

Instance rateaccepts 0–100 USD/hour
0.146 USD/hour
Minimum instancesaccepts 1–100 instances
2 instances
Maximum instancesaccepts 1–100 instances
6 instances
Average position in the autoscale rangeaccepts 0–100 %
35 %
Billed hours per monthaccepts 1–744 hours
730 hours
Commitment termone of Pay-as-you-go, 1-year reserved instance, 3-year reserved instance
Pay-as-you-go
IP-based TLS bindingsaccepts 0–100 bindings
1 bindings
Price per IP-based TLS bindingaccepts 0–500 USD/month
39 USD/month

Results

Monthly Cost
$401.37
Average Instances Billed
3.4 instances
Plan Compute Charge
$362.37
Cost if Pinned at Maximum
$639.48
TLS Binding Charge
$39.00
Saving from Autoscaling
$277.11
Annual Cost
$4,816.46

Step by step

  1. 1Values used
  2. 2Azure App Service Cost
  3. 3Monthly Cost= 401.37
  4. 4Average Instances Billed= 3.4 instances
  5. 5Plan Compute Charge= 362.37
  6. 6Cost if Pinned at Maximum= 639.48
  7. 7TLS Binding Charge= 39.00
  8. 8Saving from Autoscaling= 277.11

Assumptions and limits

  • The result is derived only from the 8 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax 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 App Service Cost calculated?

average instances = min + (max − min) × average load; monthly = average instances × instance rate × commitment factor × 730 + IP-based TLS bindings. An App Service plan bills every running instance by the hour regardless of how many apps are deployed into it, so the cost driver is the instance count that autoscale settles at rather than the number of web apps. Deployment slots run on the same plan instances, which is why a staging slot is free in cost but not in capacity.

Why does Azure App Service Cost matter?

Plans are routinely left at a fixed high instance count 'for safety', and the gap between the average and the pinned-maximum figure here is the money that autoscaling would return; reserved instances on Premium v3 add another 35–55% but lock the tier for the term, so confirm current rates in the Azure pricing calculator.

What values do I need to enter?

This calculator takes 8 inputs: Instance rate, Minimum instances, Maximum instances, Average position in the autoscale range, Billed hours per month, Commitment term, IP-based TLS bindings, Price per IP-based TLS binding. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Related Calculators

Azure App Service Cost Calculator – Calculate Monthly Cost