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How To Calculate Your Purchase Order Cost

  • By ProcureDesk
  • February 15,2024
  • 10 min read

How To Calculate Your Purchase Order Cost

purchase order cost

Purchase order costs refer to any expenses associated with creating, processing, and managing purchase orders within your company. When you know how to calculate your purchase order costs, it becomes fairly quick to discover cost-saving opportunities your business can explore. One of which is through purchasing automation.

In this blog, we’re going to cover the step-by-step process to teach you how you can calculate your purchase order cost. We’ll also discuss how automation can lower your purchase order expenses.

Want a head start?

Bonus: Download our Purchase Order Cost Template here.

If you’re looking for a P2P solution to lower your purchase order costs, explore our tool ProcureDesk. We have a team of experts who can walk you through how it works. Click here to see it in action

How To Calculate Purchase Order Cost

In the steps below, we will walk you through a step-by-step process to calculate the cost of a purchase order.

Step 1: Document Your Purchase Order Process

The first step is to list down all stages in the purchasing process. If you already have a well-defined process, then that is great.

Here is an example of steps in the purchasing process

A User Creating The Purchase Requisition

In this, you are documenting how the employee creates the requisition. For example, whether the process is manual or system-based. If system-based, do you have catalogs or other ways to reduce the data entry by the user?

Requisition Approval By Manager

Here you are documenting the steps that are involved in the approval process. The critical step is to note how many requisitions are approved at each approval level.

Are most of the requisitions approved by a manager, or do most of the requisitions go to an executive for approval?

Measuring this is important because executives are paid more than managers, so it is crucial to accurately document where the approvals are happening when calculating the cost of this step.

Here is interesting research by CAPS.

Number Of Steps In The Purchase Order Process

This step is to calculate the total efficiency of the purchase order process.

Let me explain. Based on the type and amount of the requisition, it might go to different people for approval.

So if you can reduce the number of steps or simplify your purchasing process, you can reduce the overall cost of the process.

We will cover this in a later section. For now, document the average number of steps in the whole process.

Creating The Purchase Order

How do you create your purchase orders?

Are the purchase orders created manually, or are they created automatically by a system?

If the orders are created manually, then how many people are involved in this step?

Also, what are the different types of purchase orders you are creating?

If you have a buyer assigned to this task, this is your fixed cost and other variable costs.

For example – the time it takes to create a 1-line vs. 30-line purchase order is significantly different. It takes time to enter information like item details, quantity, shipment details, shipping costs, etc.

If you don’t have an inventory management system, you have to check for item inventory levels and calculate economic order quantity.

If the process is fully automated, then that is great. In that case, you are already adopting the best practices.

Here are exciting statistics from CAPS research.

Sending The Purchase Order To A Vendor

How is the purchase order sent to the supplier?

Do you email, fax, etc.

The manual process, of course, takes time, and if the process is automated, you have reduced at least one step in your purchasing process.

In addition, you might also have to create the PO in your accounting or ERP(Enterprise Resource Planning) system.

In the next step, we will calculate the time it takes for each of these steps.

Step 2: Calculate The Average Time For Each Step In Your Purchase Order Process

Here you want to calculate the average time taken at each step. This step is tricky because you have to take the average of all the steps in the process.

For example, calculate the average time for steps required to approve a purchase requisition.

The time it takes to create a requisition for office supplies is significantly less than creating a requisition that includes a bill of material for new capital equipment.

Now I’m not asking you to look at every requisition and calculate the time for each of them. But you can do a high-level breakdown of the type of requisitions and the average time for each of them.
You can use a model like the following.

  • Create different buckets for the different types of requisitions – In this case, it is Low, Medium, and High.
  • Estimate the % for each type of requisition.
  • Estimate the average time for each type of requisition.

Calculate the weighted time and add all three types to get the average time. In this case example, the average time for creating a requisition is 12.5 minutes.

We mentioned that it is an estimated time because you can spend all the time on this to get a perfect measurement. The idea is to do a quick assessment.

Similarly, you can create the average time for each step you identified in the previous section.

It would help if you had an average time for each of the following:

  • The average time for approvals – Don’t just include the time for approving the order but also calculate the time for chasing executives for approvals.
  • The average time for creating a purchase order. You can either take an average time based on purchasing team feedback or create different categories for purchase and do a similar assessment as we did for requisitions above.
  • The average time it takes to send the purchase order to the supplier.

Step 3: Estimate The Cost Of Each Individual Involved In The Purchase Order Approval Process

The next step is to estimate the cost of an individual role involved in the approval process.

I’m not suggesting that you ask people how much they are paid, but your finance department should be able to provide you with an average number you can plug in your calculation.

Don’t just take the base salary but take the fully loaded cost, which includes company cost for employees—a simple rule of thumb is to add 30% to the employee’s salary.

For the procurement organization, you should be able to plug in the exact numbers.

Preferably calculate the cost per minute.

The reason is that the average time for requisition approval is in minutes, and you want to calculate the cost based on that time.

Step 4: Calculate The Total Purchase Order Cost

So with all this data, you are now ready to calculate the total cost of a purchase order.
Create an Excel sheet that looks like the following.

Bonus: Download our Purchase Order Cost Template here.

Let’s first calculate the total cost per resource. You can adjust this to your own cost.

The resource type is the different resources involved in your approval process. Note that we include the resource type and not the resource title since that will take more time.

Again this is just an estimate.

The annual cost is the average loaded cost for each resource type.

Per-hour cost is the annual cost divided by 1820 hours.

You can check with your finance department on what they consider annual FTE hours.

Per-minute cost is, of course, per hour cost/60.

The numbers are rounded off to keep this simple.

Purchase Order Cost = Average time * Per minute cost of the resource

Add the total cost for each of the steps.

please note that we assume that we created the purchase orders manually.

But if that is not the case, adjust the steps accordingly.

Bonus: Download our Purchase Order Cost Template here.

In the example above, the cost of the purchase order is $62.7.

You can calculate the annual cost by taking your annual count of purchase orders * Cost of a PO.

In this example, we assumed that the annual purchase order count is 10,000 and the calculated annual cost is $627,000.

Even if you can reduce the cost by 20 – 30% ( Which is not unrealistic ) – that is annual cost savings of $125,400 to $188,100.

Of course, it is up to you to decide if this is worth your time and effort.

How To Reduce The Cost Of Processing A Purchase Order?

Now let’s look at options for reducing your purchase order cost.

So what are the cost elements?

You can broadly divide the cost into two broader categories:

  • Data entry cost: This category includes the cost of gathering information to create a requisition and entering data into the system, whether creating a requisition or entering a purchase order in the system.
  • Review cost: This category includes a review of the data by different users which could include a review of requisition or order for data accuracy and the review of requisition or order by the manager for approval.

Let’s look at some ways to reduce the cost of the purchase order in these categories.

Approach #1: Simplifying Your Purchase Order Process

Before you look into the automation of the purchase order process, look at your current purchasing process.

Simplifying your purchasing process can significantly help in reducing the cost of the entire purchase order process.

Let’s first consider the steps in the purchasing process and how to simplify it.

In this step, you look at your complete purchasing process and identify steps that are either redundant or time-consuming for the end users.

Here end-users are company employees who are putting in the requisitions because that is the source of frustration and time in the entire purchasing process.

Related: Automate Manual Purchasing Process And Control Cost With Requisition Management Software

Steps In The Approval Workflow

How many steps do you have in the approval process?
Is your approval process optimized?

Let’s take an example – let’s say you have a rule that everything above $1,000 needs to be approved by an executive of the Company.

Now let’s analyze how many requisitions are above that threshold.

Let’s say the result is that 5% or 10 % is above that threshold.
Then that makes sense because the idea is that senior management should only approve high ticket expenses.

This allows them to do cost control by rejecting unwanted expenses.

Contrary to that, let’s say 50% of requisitions are above the $1,000 threshold – then it might be time to review the approval process and decide whether you still need to send all such requisitions to the executive director.

You might need to increase the threshold.

This change will allow executives to effectively use their time and reduce the time spent on approving requisitions.

Any Additional Review Process

Are there any other review processes that procurement can eliminate?

For example, the requisitions for inventory items need to be reviewed by the inventory manager in some companies.

The review is generally in place to ensure that you don’t order items already in inventory or that optimal inventory levels are maintained.

Instead of keeping the review during the creation of the requisitions or orders, maybe it is helpful to have this review done before entering the requisition/order in the system.

The alternative would be to shift the responsibility of order creation to a person in the inventory department to only place orders after verifying the inventory levels.

You should review every step in the purchasing process and question whether that step is adding value anymore.

You might find that a particular step was put in place ten years ago and for a reason that is not valid anymore.

Related: A Guide To Integrated Purchase Order And Inventory Software

Approach #2: Automation Of Your Purchase Order Process

Ok, I am stating the obvious here. ProcureDesk is a purchasing automation platform, so of course, we talk about automation!

On a serious note, smaller to mid-market companies can realize the value of automation but struggle with the business case for automation of the purchase order systems.

Hopefully, this analysis of the cost of a purchase order can help you strengthen that business case.

Let’s look at areas where automation can help.

Reducing Time To Create Requisitions

Employees can significantly reduce the time for creating requisitions by leveraging a purchasing system.

Purchase order automation helps in the following ways:

  • Building more catalogs – you can look at repetitive spending and add those items to a catalog. That way, users can create requisitions with fewer clicks and without entering the data manually in the system.
  • The data for past orders are readily available, so it is easy to reference old orders while creating a new order.

Reducing Time For Approval

Purchasing automation can significantly reduce the time it takes to get the purchase approved.

The benefits are as follows.

Automated Approvals

If you have a manual approval process, your users are spending the time to figure out the proper approval hierarchy.

In some cases, the approving managers might be routing the approvals to the right manager.

It is also possible that many purchase authorization requests are routed back and forth because it was routed to the wrong manager.

You can avoid all this by leveraging automation of the purchasing process.

The system can quickly identify the approval hierarchy based on Spend, department, and purchase category parameters.

Reduced Approval Time

The other benefit is the reduced approval time. If the purchasing system has a mobile app, then Managers can use that to approve requisitions. Since most executives are on-road or busy in meetings, this can be a handy feature to reduce the time for approvals.

Creation Of Orders

This step can be fully automated by leveraging a purchasing automation tool. Instead of buyers creating purchase orders manually in your system, the purchasing system can do this for you.

Also, most purchasing systems integrate with your accounting/ERP system, so the same PO data is also available in your ERP system.

It also saves you time on sending the PO to the supplier because that step can be fully automated based on the preferences of your suppliers.

The obvious case where it doesn’t work is if your supplier still demands a paper purchase order.

If you’re looking for a P2P solution to lower your purchase order costs, explore our tool ProcureDesk. We have a team of experts who can walk you through how it works. Click here to see it in action

Approach #3#: Reduce The Number Of Purchase Orders

One obvious step in reducing the cost of a purchase order is to have a limited number of purchase orders. Fewer POs lead to a lower processing cost.

There are a couple of things the purchasing team can do to reduce the number of purchase orders issued by your company

Consolidate Purchase

Can the purchase be consolidated across departments or different people within the departments?

For example – let’s take the case of products like office supplies. If the purchasing site is open to all users in the company

  • They might order more often – order when you need it.
  • Multiple people might order similar items at different frequencies. This though is convenient but if you were issuing purchase orders to vendors, then the cost could easily add up.

Instead of that, you can consolidate the purchase by having one department per person ordering those items. To further reduce the frequency of orders, you can order monthly.

This is a very simple example and might not be a consideration for you if you are a small company.

Vendor Managed Inventory

For items for which you want to maintain inventory, you might want to consider a vendor-managed inventory option.

In that case, you can significantly reduce the number of purchase orders

Blanket Order For Services

If you purchase recurring services – for example, cleaning services then instead of creating a purchase order every month, you can create a blanket order with the annual amount.

The vendor can invoice against that order till the amount is consumed.

Though it reduces the number of purchase orders, it does need an additional layer of diligence and compliance. You want to make sure that invoices are properly vetted before they are paid, otherwise, the vendor could charge extra and still get paid if the invoice amount is lower than the amount on the blanket order.

Using Average Purchase Order Process Cost Benchmarks

When it comes to benchmarking the performance of the procurement organization, there are many benchmarks.

Different organizations conduct studies, and based on that; you can see that the average PO processing cost ranges anywhere between $50 to $1000.

Let’s look at some of the benchmarks.

APCQ: Cost per purchase order varies from $35.88 to a whopping $506.52.

As per CAPS research, the cost ranges from $53 to $ 741.

Next-level purchasing has a great blog post on this.

After looking at the benchmarks, most procurement leaders have one of the following two observations.

  • There is a real business case for reducing the cost of a purchase order. Let’s say it costs $500 to process a purchase order, and let’s say you process 10,000 purchase orders a year. If you reduce the cost by 10% ($50) – there are annual cost savings of $500,000.
  • The other observation is, that there is no way our cost is this high. The cost benchmarks don’t make sense or do not apply to our industry or Company.

So which observation is correct?

In our view, both are correct.

There is no standard benchmark that you can apply to your situation to get the cost of processing a purchase order.

On the other hand, there is a business case for reducing the cost of purchase orders because this is an actual cost. Any efficiency you can gain by optimizing your purchasing process can result in hard savings.

Instead of relying on the standard benchmark, we highly encourage you to lean into the step-by-step guide to calculating your purchase order costs which we shared above.

Is Purchase Order Cost Savings Real?

Procurement can categorize cost savings into hard savings and soft savings, or in other words, cost reduction or cost avoidance.

The same is true for the cost of the Purchase order.

Finance View

Let’s assume you identified some changes to the purchasing process, which would reduce the number of steps required for approving the purchase order.

Another example is automation – you decided to invest in a purchasing system that would automate the process and reduce the cost.

Now let’s say making these changes requires an investment of $X/year.

The obvious next step is to build a business case to secure funding and present it to your finance committee or boss.

99.99% of the time, finance would ask – would this lead to headcount reduction?

In most of the purchasing automation business cases, it generally doesn’t include headcount reduction as part of the cost-saving calculations.

If it does lead to headcount reduction, then the business case is straightforward. However, if that is not the case, here is how you should go about justifying the investment.

Even though it doesn’t lead to cost reduction, it does lead to the following.

  • It will free up your resource time to work on other value-add activities, like increasing Spend under management.
  • The resources that are manually checking compliance can now rely on the system to do it. The Procurement team can then leverage the resource time to build catalogs that can drive automated compliance.

Justifying the business case is very straightforward if you decide to justify the investment by increased Spend under management.

Incremental Cost Savings

Let’s say your total vendor spend or Sourceable Spend is $200M.

Sourceable Spend means spending, excluding payroll, taxes, employee benefits, and regulatory payments.

Current sourceable Spend: $200M

Current spend under management: $100M

Average savings delivered: 3% of the Spend under management [Change this number to what you are delivering].

Since you can increase your Spend under management by freeing up your resources, you can allocate these resources to high-value-added activities.

Let’s say you increased Spend under management by 3% [arbitrary number, do your analysis to get to this number], which means an additional $6M [3% x $200M ] in Spend under management.

If your average rate of savings is 3% – that means you can now deliver an additional $180,000 [3% x $6 M ] in annual savings because of freeing up resources.

Are these savings enough to justify your investments? We think so, So run your numbers and see what hard savings you can deliver by reallocating resources from tactical work to strategic work.


What Is The Cost Of Creating A Purchase Order?

The cost of creating a purchase order typically involves administrative expenses such as staff time and any associated software or system costs required for order placement and tracking.

Related: 10 Invoice And Purchase Order Software (Review And Pricing)

What Is A Purchase Order Expense?

A purchase order expense refers to the overall cost incurred by a business in the process of creating, processing, and managing purchase orders. This includes administrative costs, software expenses, and any other resources dedicated to the procurement process.

What Factors Contribute To The Cost Of Processing A PO?

Factors contributing to the cost of processing a purchase order include the complexity of the purchasing process, the volume of orders, the number of stakeholders involved, the efficiency of the procurement system, and any additional customization or compliance requirements.

Do PO Processing Costs Vary For Different Industries?

Yes, purchase order processing costs can vary significantly across different industries based on factors such as regulatory compliance, supplier relationships, the nature of goods or services being procured, and the level of automation or technology adoption within the industry.

The Bottomline

When it comes to calculating the cost of a purchase order, there are a lot of benchmarks available. Some might apply to you and some don’t.

The best approach is to calculate your own cost based on the approach we defined in this post. We agree that it takes some time but it is more reliable than using any standard benchmark.

Moreover, when it comes the time to invest in technology for purchasing automation, you can use these numbers to build the business case for investment and no one will question your assumptions about the cost per purchase order.

So click on the link below, download the template, and start measuring the real purchase order cost.

What you should do now

Whenever you’re ready… here are 4 ways we can help you scale your purchasing and Accounts payable process.

  1. Claim your Free Strategy Session. If you’d like to work with us to implement a process to control spending, and spend less time matching invoices, claim your Free Strategy Session. One of our process experts will understand your current purchasing situation and then suggest practical strategies to reduce the purchase order approval cycle.
  2. If you’d like to know the maturity of your purchasing process, download our purchasing process grader and identify exactly what you should be working on next to improve your purchasing and AP process.
  3. If you’d like to enhance your knowledge about the purchasing process, check out our blog or Resources section.
  4. If you know another professional who’d enjoy reading this page, share it with them via email, Linkedin, Twitter.