Year Over Year Growth Calculator: YoY Growth

A Year Over Year Growth Calculator will help you to calculate the growth percentage between two periods. Year over year growth (sometimes referred to as YoY) is widely used in the United States to calculate how well a business is doing based on revenue, sales, web traffic, investment, and other economic factors.

By comparing one year with the previous year you can see if your business or particular metric is growing, decreasing or staying fairly consistent. YoY can help to eliminate seasonal fluctuation that might occur between months.

For example, if your US e-commerce business made $150,000 in sales in the current year compared with $120,000 in the last year, by calculating your YoY growth you can see the percentage growth and make it easier to show how well your business is performing.

Our Year Over Year Growth Calculator can help you calculate the growth or decrease you have had this year by using two figures. Simply enter the previous year’s value and current year value to instantly see what percentage increase you have had. This can be useful for showing how much increase you have had in revenue, profit, sales, costs, customers, web traffic and more.

How to use the Year Over Year Growth Calculator

To calculate your YoY growth follow the steps below:

Enter previous year value. This is where you would enter the value of the metric you want to calculate from the previous year. For example, enter $120,000 for your yearly revenue.

Enter current year value. This is where you would enter the value of the metric you want to calculate for the current year. For example, enter $150,000.

Calculate YoY growth. Simply click the calculate button to see the percentage difference.

Check your result. See if your metric has increased, decreased or stayed the same.

Compare to historical data. Use your result to see how you are doing in comparison to your target.

Ensure you are comparing like for like. For example, if comparing revenue, compare your total revenue for the whole 2025 calendar year to your total revenue for the whole 2026 calendar year. Ensure the time frames are similar.

You can use any numerical data type to calculate growth. Whether this be in dollars, units sold, customers or website sessions.

Year Over Year Growth Formula

The formula to calculate year over year growth is to calculate the percentage increase/decrease between a current value and the value from the previous year.

YoY Growth (%) = ((Current Year Value - Previous Year Value)/Previous Year Value) x 100

Current Year Value – The metric value from your current period.

Previous Year Value – The metric value from the previous year.

YoY Growth (%) – The percentage increase/decrease from the previous year.

A positive result means you have grown and a negative means you have decreased. A result of 0 means there was no change.

For example, if your annual revenue has increased to $200,000 to $240,000 then you will have a 20% growth rate.

Your previous year value must be greater than 0. If it is 0 then you won’t be able to calculate the percentage growth rate as you will be dividing by 0. If it is negative then whilst you can mathematically calculate the percentage in some instances it can be misleading depending on what metric you are comparing. For example if comparing profit/loss.

Example

Let’s say your small business in the USA has made $120,000 in revenue last year and $150,000 this year.

Previous Year Value: $120,000

Current Year Value: $150,000

YoY Growth = (($150,000 − 120,000)/120,000) x 100

YoY Growth = ($30,000 / $120,000) x 100

YoY Growth = 25%

Below is a breakdown of your results:

Metric

Value

Previous Year Value

$120,000

Current Year Value

$150,000

Increase

$30,000

YoY Growth

25%

This means your business has grown by 25% from last year. You have made an extra $30,000 in revenue during the same period.

However, this doesn’t necessarily mean you have improved your profitability. If your costs have increased at a faster rate than your revenue then you may actually have seen a reduction in profit.

Understanding Your Results

Your results from a Year Over Year Growth Calculator will tell you how much your metric has changed from last year.

Positive Growth: If your result is above 0% then your current value is higher than your previous year. For example, a YoY growth of 15% means your metric has increased by 15%.

Negative Growth: If your result is below 0% then your current value is lower than your previous year. A result of -10% means your metric has decreased by 10% from last year.

Zero Growth: If your result is 0% then your current value and previous year value are equal.

Absolute Increase: This is the difference between your values. Simply take your previous year value away from your current year value. This will tell you how much your metric has increased/decreased.

It is important to understand your YoY growth. If you have a business which has grown from $10,000 to $15,000 then you would have a 50% growth rate. Whereas a business which has grown from $1 million to $1.2 million would have a 20% growth rate. Although the second business has a lower growth percentage, it has increased by a lot more.

Factors that can affect Year Over Year Growth

There are a number of factors that can affect your YoY growth.

Previous Year Value: If your previous year value is very low/high then your growth rate can look quite extreme.

Seasonal Fluctuations: Retail, tourism and many other industries can have seasonal fluctuations. Using like for like periods can help give a more meaningful result.

Market Conditions: Inflation, interest rates, customer spending, competition and general economic factors can all affect your business.

Price Increase: You may have seen an increase in revenue as your prices have increased.

Customer Demand: Changes in customer preferences, acquisition and purchases can affect your growth.

Marketing/Sales: Marketing campaigns, promotions, new channels and product launches can affect your revenue and customers.

Costs: Your revenue growth may not be the same as your profit growth if your costs have changed.

Changes in Reporting: If your method of accounting, time frame, business structure or data has changed then your results may not be as accurate from year to year.

Benefits and Uses of a Year Over Year Growth Calculator

A YoY Growth Calculator can help you and your business to calculate how well you are doing by using a simple percentage calculation.

Revenue: Calculate how much your revenue has increased this year.

Sales: Compare how many units you have sold, order value or sales revenue.

Marketing: Track how your web traffic, leads, conversions and customers have changed.

E-Commerce: Calculate how your sales, average order value and customers have changed.

Finance: Track how your costs, profit, operating profit and more have changed.

Budgeting: Use historical growth to help budget for your business.

Investment: Compare selected financial metrics over the year. Taking into consideration market fluctuations.

Economics: Track how certain economic factors have changed.

As a marketing manager you can track how many sessions your website has had this year to see if your organic traffic has improved. As a business owner you can track your revenue and costs to see if your growth is translating into improved results.

The calculator is particularly useful when presenting your annual performance to management, stakeholders, investors and clients.

Accuracy, Assumptions and Limitations

A Year Over Year Growth Calculator will give you an accurate calculation, assuming your values are correct and comparable. However, it won’t tell you why your metric has changed or if it is sustainable.

The formula assumes that your values are for the same metric. Your values should also be measured using the same units, definition and time frame. If comparing a full calendar year to a partial year then you could get misleading results.

This is only measuring the percentage change, not the actual performance. Just because you have a high growth rate doesn’t necessarily mean that your business is large, profitable or stable.

The calculation doesn’t automatically take inflation into consideration. For example, your revenue could have increased by 5% but this could be due to an increase in prices of goods/services.

If your previous year value is 0 then you won’t be able to calculate a percentage using the standard formula. If you have a negative previous year value, particularly if looking at profit/loss then you need to be cautious.

To get a more accurate result compare like for like, look at historical data from a number of years and consider YoY growth with absolute increase, margins, customers and relevant market conditions.

FAQ’s

1. What is Year Over Year Growth?

Year over year growth is used to calculate how much a metric has changed as a percentage compared to the same period last year. It is often used to calculate revenue, sales, profit, web traffic and more.

2. How do I calculate YoY growth?

To calculate YoY growth you need to take your previous year value away from your current year value. Then divide this by your previous year value and multiply by 100 to get your percentage increase.

3. What is a good growth rate?

This will depend on your industry, business size, economic conditions and metric. Compare your results against your historical data, business target and relevant industry benchmarks.

4. Can YoY growth be negative?

Yes. If your YoY growth is negative this means your current value is lower than your previous year. For example, if your revenue has decreased to $200,000 to $180,000 then you will have a -10% growth.

5. Can I calculate YoY growth if my previous year value is 0?

No. If your previous year value is 0 then you won’t be able to calculate a percentage using the standard formula. Instead report your absolute increase and state that your metric has increased from 0.

6. What is the difference between YoY growth and Month Over Month Growth?

YoY growth compares your metric to the same period last year whereas Month Over Month compares it to the previous month. By comparing YoY you can take seasonal factors into consideration.

7. Does YoY growth take inflation into consideration?

No. YoY growth compares the percentage change between two values. To understand your real growth you need to adjust your figures using an appropriate inflation measure.