Cost benefit analysis (CBA): Steps, formulas, examples

In 1848, a French engineer named Jules Dupuit was working on a bridge. As an amateur economist, he decided to run an experiment to answer this question: How much should the government charge for tolls to cover the costs of building and maintenance? This may sound simple, but Dupuit threw in a curveball; when considering net costs, he subtracted the social benefit the bridge would bring.

Calculating the social benefit of a bridge sounds like a puzzler, but not for Dupuit. He just measured how much people were willing to pay to use it. Then, with some fancy calculations, he was able to recommend a toll amount that accounted for the costs and benefits of his bridge.

And so, the cost-benefit analysis was born. The process has been refined since Dupuit's day, and it's now used less for calculating bridge tolls and more for determining whether decisions are economically feasible.

In this article, you'll learn:

• What a cost-benefit analysis is and when to use one

• How to conduct your own analysis in five practical steps

• Key formulas including BCR, NPV, and ROI

• Real-world examples and the pros and cons of this approach

What is a cost-benefit analysis?

A cost-benefit analysis (CBA) is a systematic process for comparing the total expected costs of a decision against its total expected benefits to determine whether it's worth pursuing. By assigning monetary values to both sides of the equation, you can make decisions based on evidence rather than opinion or bias.

Here's how it works:

• Quantify costs and benefits: Assign dollar values to each factor involved in your decision.

• Calculate net gain: Subtract total costs from total benefits to see if you come out ahead.

• Evaluate the ratio: A benefit-cost ratio greater than 1 means benefits outweigh costs.

CBA is particularly useful in project planning, where it helps compare the financial feasibility of new initiatives against their potential returns.

When should you use a cost-benefit analysis?

A cost-benefit analysis works best when your decision-making process requires determining whether to pursue a specific course of action. It also helps when your decision has clear economic costs and benefits.

For example, it's easier to create a CBA to determine the feasibility of a new project than to evaluate whether a new hire would be a good fit for your team. That's because it's hard to assign concrete financial costs and benefits to someone's experience and work potential.

This type of economic analysis also takes some time to complete, so it's best when you're faced with a big decision that will affect your team or project success. For smaller or less complex decisions, try a simpler process, such as a decision matrix.

Here are some examples of when to use a cost-benefit analysis:

• Developing a new business strategy

• Making resource allocation or purchase decisions

• Deciding whether to pursue a new project

• Comparing investment opportunities

• Measuring the potential effects or desirability of new company policies

• Assessing proposed changes to your company structure or processes

How to do a cost-benefit analysis

Creating a cost-benefit analysis may seem daunting at first, but we've simplified the methodology into five concrete steps. After you've run through this process once, you can tailor these steps to suit your specific project or team needs.

1. Build a process

First, create a process that outlines the goals of your analysis, your current situation, and the scope of what it will cover.

Your process should include these components:

The question your analysis will answer

A successful CBA always starts with a good question. It helps to be as specific as possible; for example, it's easier to answer "Should we improve our mobile app?" than a broader question like "What products should we improve to drive adoption?"

An overview of your current situation

An overview provides context for your analysis and gives stakeholders a shared starting point. Here's what to include:

• Background: A brief description of your current situation.

• Current performance: Quantitative data to demonstrate how things are going in your current situation.

• Opportunities: Any areas of improvement from your current situation.

• Projected future performance with the status quo: Quantitative data to predict how things will go in the future if nothing changes.

• Risks of the status quo: What might go wrong if you don't change anything?

For example, imagine you're trying to decide whether to overhaul your mobile app. Here's what your overview might look like:

• Background: We have a mobile app and a web app.

• Current performance: Our mobile app has 100k users, and our web app has 400k users.

• Opportunities: We have 300k users who use the web app but not the mobile app.

• Projected future performance with status quo: Adoption of our web app has grown 50% YoY. We project this will continue, and there will be 600k users one year from now. Meanwhile, adoption of our mobile app has grown 10% YoY. We project this will continue, and there will be 110k users one year from now.

• Risks of status quo: Lack of mobile adoption means users have less flexibility. Competitors with better mobile apps could win the category, while our brand may become known for having a poor mobile experience.

When building a cost-benefit analysis process, it's important to accurately estimate the expected costs associated with your decision, including both direct and indirect expenses.

The scope of your analysis

Finally, your process should include the scope of your CBA. Like a project scope, this establishes boundaries for your analysis and outlines the types of information you'll consider in your calculations. Typically, your scope includes:

• The timeframe over which you'll estimate potential costs and expected benefits.

• The types of costs and benefits you'll include (or exclude).

• How you'll measure costs and benefits, such as dollar values for tangible costs and key performance indicators (KPIs) for intangible factors like brand awareness.

2. List and categorize costs and benefits

Next, it's time to list all the costs and benefits of your decision. For this step, it's helpful to collaborate with stakeholders to benefit from their specific expertise. Think of your decision like a project you'll complete to achieve your proposed course of action.

As you list out costs and benefits, sort them into the following categories. Then, in the next step, you'll estimate dollar amounts of each of these items.

Types of costs

• Direct costs: Costs incurred in producing your product, service, or project. This typically refers to the materials, equipment, or labor you need to follow through on your proposed course of action.

• Indirect costs: Fixed costs that aren't directly associated with production. These are typically ongoing overhead costs you need to operate your business, such as rent, utilities, and subscriptions to collaboration software.

• Intangible costs: Costs that you can't assign a dollar amount to, like effects on brand perception or customer satisfaction. This might also include opportunity costs, which are the value of the best alternative forgone when you make one decision instead of another.

• Costs of potential risks: unexpected roadblocks. Think of setbacks you would include in a project risk register, like data security breaches, scheduling delays, or unplanned work.

When listing tangible costs (such as direct and indirect costs), follow the same process you would when creating a project budget. Think of all the tasks you need to complete, then list out the resources required for each deliverable.

For intangible costs, you'll have to use a bit more creativity. If you're stuck, try looking at similar projects that have been completed to see what effect they had.

Types of benefits

• Direct benefits: Benefits you can measure with a currency value, like the revenue you'll gain from a project.

• Indirect benefits: Benefits you can perceive but can't measure with currency values, such as increased customer satisfaction and improved brand awareness.

3. Estimate values

Now it's time to apply estimation methods to assign values to each cost and benefit you've listed. Your approach will differ based on the type of item:

• For tangible items: Assign specific dollar amounts to direct costs, indirect costs, and direct benefits.

• For intangible items: Use KPIs instead of monetary units. For example, measure customer satisfaction by tracking churn rate.

If you can, use the same KPIs for both costs and benefits so you can easily compare them later.

We can't predict the future, so these are ultimately just estimates. To make your calculations as accurate as possible, compare costs and benefits from similar projects you've completed in the past.

Old projects are a gold mine of historical data and lessons learned. They reveal the real-world economic value of past costs and benefits, as well as any items you might have overlooked. Using a project management tool makes this step easy since all your project information is housed in one place.

4. Analyze costs vs. benefits

Now comes the fun part, the actual analysis of your costs and benefits. Before you get started, here are some key terms to keep in mind:

• Total costs: The sum of all costs.

• Total benefits: The sum of all benefits.

• Net cost-benefit: Total benefits minus total costs. This is also called net benefits.

• Net present value (NPV): The difference between the present value of cash inflows and the present value of cash outflows over a period of time.

• Internal rate of return (IRR): Calculates the profitability of an investment by determining the annualized return rate that makes all cash flows balance out to zero.

• Benefit-cost ratio: The proposed total cash benefit divided by the proposed total cash costs. If your benefit-cost ratio is greater than one, benefits outweigh costs.

• Discount rates: An interest rate you apply to future costs and benefits to convert them into their present value.

• Sensitivity analysis: Determines how uncertainty affects your decisions, costs, and profits by comparing worst- and best-case scenarios.

These are a lot of fancy terms, but don't let that scare you. To keep things simple, you can just calculate your net cost-benefit and leave it at that.

If you used KPIs to measure intangible costs and benefits, you can compare those separately. To analyze KPIs, there are a couple of different approaches:

• If you have the same KPIs for costs and benefits, you can subtract costs from benefits to calculate net gains.

• If you have different KPIs for costs and benefits, you can compare each one to the status quo. It's better to use the same metrics for costs and benefits so you can more accurately compare them.

5. Make recommendations

Now that you've completed your cost-benefit analysis (huzzah!), you can make a recommendation. Here are some factors to consider for your decision:

• If your net cost-benefit is positive, that means the benefits of the project outweigh the costs. However, if it's too small, you might not get much benefit from all the effort you put in.

• If your net cost-benefit is negative, that means your project costs outweigh the benefits. Consider what the biggest cost inputs are and whether a different approach could mitigate them.

• If you used KPIs to measure intangible costs and benefits, you need to consider those in addition to your net cost-benefit.

Cost-benefit analysis formula

Understanding the formulas behind cost-benefit analysis helps you calculate and interpret your results with confidence. Here are the key formulas you'll use:

Benefit-cost ratio (BCR)

The benefit-cost ratio is the most common formula used in cost-benefit analysis:

BCR = Present Value of Benefits ÷ Present Value of Costs

If your BCR is greater than 1, the benefits outweigh the costs. A BCR of 1.5 means you're getting $1.50 in benefits for every $1 spent.

Net present value (NPV)

Net present value accounts for the time value of money, showing your investment's total value in today's dollars:

NPV = Present Value of Benefits − Present Value of Costs

A positive NPV indicates the projected benefits exceed the costs. A negative NPV suggests you may want to reconsider or modify your approach.

Return on investment (ROI)

While not exclusive to cost-benefit analysis, ROI expresses returns as a percentage:

ROI = (Net Benefits ÷ Total Costs) × 100

These formulas work together to give you a complete picture of your decision's financial outcome.

Cost-benefit analysis examples

Cost-benefit analysis offers valuable insights by quantifying and comparing the pros and cons of different choices. Here are three practical examples demonstrating how cost-benefit analysis can be applied.

Cost-benefit analysis example 1: Implementing new software in a small business

The decision to upgrade software systems in a small business presents a classic case for cost-benefit analysis.

• On one side, there's the initial financial outlay and the training costs for employees.

• On the other hand, the benefits include improved efficiency, faster customer service, and long-term savings.

By quantifying these factors, a business can determine whether an investment in new technology will yield a favorable return.

Cost-benefit analysis example 2: Assessing the impact of new environmental regulations

A manufacturing company faces new environmental regulations that require significant changes to its processes.

The cost-benefit analysis here involves comparing the upfront costs of altering equipment and workflows with the long-term benefits, such as:

• Reduced environmental effects

• Compliance with legal requirements

• Potential improvements in public image

This analysis helps decision-makers understand whether the benefits of adhering to these new regulations outweigh the associated costs.

Cost-benefit analysis example 3: Evaluating an urban public transportation expansion

A thorough cost-benefit analysis is essential when a city considers expanding its public transportation system.

This involves calculating the direct costs of construction and operation expenses against the benefits, including:

• Reduced traffic congestion

• Lower pollution levels

• Improved accessibility for residents

By assessing these factors, the city can decide if the project's long-term benefits justify the significant initial investment.

Pros and cons of cost-benefit analysis

Understanding both the advantages and limitations of cost-benefit analysis is important for decision-makers. Here's a quick overview:

Advantages of cost analysis

• Streamlining decision-making processes: Cost-benefit analysis simplifies complex decisions by translating them into quantifiable terms.

• Revealing overlooked costs and advantages: Some benefits or expenses are not immediately apparent, but a thorough cost-benefit analysis makes them clear.

• Emphasizing a data-centric method: By focusing on quantifiable data, cost-benefit analysis promotes objectivity, reducing the influence of subjective biases.

Limitations of cost-benefit analysis

Cost-benefit analysis is a handy tool for data-driven decision making. But like any estimation technique, it isn't perfect. Keep in mind these limitations:

• Revenue and cash flow can be unpredictable due to changing market conditions.

• In some cases, the costs or benefits of a project or decision can't be directly reflected by dollar amounts.

• Value is subjective when you use KPIs to measure intangible costs and benefits.

• It can be hard to accurately predict all potential risks.

• A cost-benefit analysis requires a significant time commitment to complete.

• Forecasting accuracy diminishes for projects extending over a long period.

• The effectiveness of cost-benefit analysis depends on the accuracy of the data used.

If you decide that a cost-benefit analysis isn't the right fit for your particular situation, you may want to consider creating a decision matrix or decision tree analysis instead.

Make better decisions with confidence

A cost-benefit analysis helps you use data to make the best possible decision. That means you can say goodbye to coin flips and choose your options with confidence.

Creating a cost-benefit analysis can seem like a project in its own right, especially if you're working with multiple stakeholders. Before you dive in, consider using a project management tool to coordinate work.

Asana lets you create and assign tasks, organize work, and communicate with stakeholders directly where work happens. You can also map out your entire cost-benefit analysis project and save it as a template for future use.

Ready to bring structure to your next big decision? Get started with Asana today and turn complex choices into clear, data-driven action plans.

Frequently asked questions about cost-benefit analysis