Function pricing (consumption vs premium) in Azure - Visual Side-by-Side Comparison

Process Flow - Function pricing (consumption vs premium)

Start: Choose Function App

↓

Select Pricing Plan

↓

Consumption Plan

↓

Pay per execution & resource use

↓

Auto scale with demand

↓

Premium Plan

↓

Pay fixed + per execution

↓

Always warm instances

↓

Scale based on pre-warmed capacity

This flow shows choosing between Consumption and Premium plans for Azure Functions, highlighting cost and scaling differences.

Execution Sample

Azure

Choose plan: Consumption or Premium
If Consumption:
  Pay per execution
  Auto scale
If Premium:
  Pay fixed + execution
  Always warm
  Scale with pre-warmed instances

This pseudo-code shows decision and behavior differences between Consumption and Premium plans.

Process Table

Step	Plan Selected	Cost Model	Scaling Behavior	Instance Warmth
1	Consumption	Pay per execution and resource use	Auto scale instantly with demand	Cold start possible
2	Premium	Fixed cost + pay per execution	Scale with pre-warmed instances	Always warm, no cold start
3	Consumption	Cost depends on executions and memory used	Scale down to zero when idle	Cold start on new requests
4	Premium	Higher base cost but better performance	Scale faster with pre-allocated instances	No cold start, better latency
5	End	-	-	-

💡 Comparison ends after showing cost and scaling differences for both plans.

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	Final
Plan Selected	None	Consumption	Premium	Consumption	Premium	Comparison complete
Cost Model	None	Pay per execution	Fixed + pay per execution	Pay per execution	Fixed + pay per execution	Shown
Scaling Behavior	None	Auto scale	Scale with pre-warmed	Auto scale	Scale with pre-warmed	Shown
Instance Warmth	None	Cold start possible	Always warm	Cold start possible	Always warm	Shown

Key Moments - 3 Insights

Why does the Consumption plan sometimes cause delays when starting functions?

Because Consumption plan instances can be cold (not running) and need to start on demand, causing cold starts as shown in execution_table rows 1 and 3.

Why does the Premium plan cost more even if you have few executions?

Premium plan has a fixed base cost for always warm instances plus execution costs, so you pay even if usage is low, as shown in execution_table rows 2 and 4.

How does scaling differ between Consumption and Premium plans?

Consumption scales instantly but can scale down to zero causing cold starts; Premium scales with pre-warmed instances avoiding cold starts, as shown in execution_table rows 1,2,3,4.

Visual Quiz - 3 Questions

Look at the execution_table, at which step does the Premium plan show 'Always warm' instances?

A Step 2

B Step 1

C Step 3

D Step 4

💡 Hint

Check the 'Instance Warmth' column in execution_table rows for Premium plan.

According to variable_tracker, what is the 'Cost Model' after Step 3 for the Consumption plan?

A Fixed cost plus execution

B Pay per execution and resource use

C No cost

D Fixed monthly fee

💡 Hint

Look at 'Cost Model' row under 'After Step 3' in variable_tracker.

If you want to avoid cold starts, which plan should you choose based on the execution_table?

A Consumption plan

B Either plan works the same

C Premium plan

D Neither plan avoids cold starts

💡 Hint

Check 'Instance Warmth' column for both plans in execution_table.

Concept Snapshot

Azure Functions Pricing Plans:
- Consumption: pay per execution, auto scale, possible cold starts
- Premium: fixed + execution cost, always warm, faster scale
- Choose Consumption for cost savings with variable load
- Choose Premium for predictable performance and no cold starts

Full Transcript

This visual execution compares Azure Functions pricing plans: Consumption and Premium. The flow starts by selecting a plan, then shows cost and scaling differences. Consumption plan charges per execution and scales automatically but may have cold starts. Premium plan has a fixed base cost plus execution charges, keeps instances always warm, and scales with pre-warmed capacity to avoid cold starts. The execution table traces these differences step-by-step. Variable tracker shows how plan selection affects cost model, scaling, and instance warmth. Key moments clarify why cold starts happen in Consumption and why Premium costs more but performs better. The quiz tests understanding of these concepts referencing the tables. The snapshot summarizes key points for quick recall.

Practice

1. Which Azure Function pricing plan charges you only when your function runs, making it ideal for infrequent tasks?

easy

A. Dedicated App Service plan

B. Consumption plan

C. Premium plan

D. Enterprise plan

Solution

1. Step 1: Understand pricing models

   The Consumption plan charges based on actual function executions, so you pay only when your code runs.

2. Step 2: Compare with other plans

   The Premium plan and Dedicated plans have fixed costs regardless of usage, making them less ideal for infrequent tasks.

3. Final Answer:

   Consumption plan -> Option B

4. Quick Check:

   Pay per use = Consumption plan [OK]

Hint: Pay only when running = Consumption plan [OK]

Common Mistakes:

• Confusing Premium plan with Consumption plan
• Thinking Dedicated plan charges per use
• Assuming Enterprise plan is standard for functions

2. Which of the following is the correct way to describe the Premium plan pricing for Azure Functions?

easy

A. Fixed cost plus charges based on usage

B. You pay only when the function runs, no fixed cost

C. Free for all usage levels

D. Charges based on number of users

Solution

1. Step 1: Identify Premium plan pricing

   The Premium plan has a fixed monthly cost plus additional charges based on how much you use it.

2. Step 2: Eliminate incorrect options

   Consumption plan is pay-per-use only, so You pay only when the function runs, no fixed cost is wrong. There is no free unlimited usage or user-based pricing.

3. Final Answer:

   Fixed cost plus charges based on usage -> Option A

4. Quick Check:

   Premium = fixed + usage cost [OK]

Hint: Premium = fixed cost plus usage charges [OK]

Common Mistakes:

• Confusing Premium with Consumption plan pricing
• Thinking Premium plan is free
• Assuming pricing depends on users

3. You have an Azure Function running on the Consumption plan that executes 1 million times a month. Which statement best describes your billing?

medium

A. You pay a fixed fee plus a small charge per execution.

B. You pay a fixed monthly fee regardless of executions.

C. You pay only for the 1 million executions plus resource usage.

D. You pay nothing because Consumption plan is free.

Solution

1. Step 1: Understand Consumption plan billing

   Consumption plan charges based on the number of executions and resource consumption, no fixed fee.

2. Step 2: Analyze options

   You pay a fixed monthly fee regardless of executions. and C mention fixed fees which do not apply to Consumption plan. You pay nothing because Consumption plan is free. is incorrect because Consumption plan is not free.

3. Final Answer:

   You pay only for the 1 million executions plus resource usage. -> Option C

4. Quick Check:

   Consumption = pay per execution [OK]

Hint: Consumption plan charges per execution only [OK]

Common Mistakes:

• Assuming fixed monthly fee on Consumption plan
• Thinking Consumption plan is free
• Mixing Premium plan billing with Consumption

4. You deployed an Azure Function on the Premium plan but noticed unexpectedly high costs. What is a likely cause?

medium

A. Premium plan has a fixed cost plus usage, so fixed cost adds even if usage is low.

B. Premium plan is free for the first 1 million executions, so costs should be zero.

C. You forgot to enable the Consumption plan, so you are charged double.

D. You are charged only when the function runs, so high usage caused high cost.

Solution

1. Step 1: Understand Premium plan cost structure

   Premium plan includes a fixed monthly cost plus charges based on usage.

2. Step 2: Identify cause of high costs

   Even if usage is low, the fixed cost applies, which can cause unexpectedly high bills.

3. Final Answer:

   Premium plan has a fixed cost plus usage, so fixed cost adds even if usage is low. -> Option A

4. Quick Check:

   Premium fixed cost causes base charges [OK]

Hint: Premium plan always has fixed cost component [OK]

Common Mistakes:

• Thinking Premium charges only on usage
• Confusing Consumption plan with Premium
• Assuming Premium plan is free for some executions

5. You expect your Azure Function to have steady, high traffic with occasional spikes. Which plan should you choose to optimize cost and performance?

hard

A. Free tier, because it handles high traffic without cost

B. Consumption plan, because it charges only when functions run

C. Dedicated App Service plan, because it has no scaling limits

D. Premium plan, because it offers pre-warmed instances and scales smoothly

Solution

1. Step 1: Analyze workload pattern

   Steady high traffic with spikes needs consistent performance and quick scaling.

2. Step 2: Match plan features

   Premium plan provides pre-warmed instances to avoid cold starts and scales smoothly, fitting this pattern well.

3. Step 3: Eliminate other options

   Consumption plan may have cold starts causing delays. Dedicated plan is costly and less flexible. Free tier cannot handle high traffic.

4. Final Answer:

   Premium plan, because it offers pre-warmed instances and scales smoothly -> Option D

5. Quick Check:

   Steady high traffic = Premium plan [OK]

Hint: Steady high traffic? Choose Premium for performance [OK]

Common Mistakes:

• Choosing Consumption plan despite cold start delays
• Assuming Dedicated plan is best for all cases
• Thinking Free tier supports high traffic