# Year over Year Growth Calculator (YoY)

URL: https://speedycalculator.com/calculators/finance/yoy-growth/
Last updated: 2026-10-25

> The year over year growth calculator works out the percentage change between the same period this year and last year – a month, quarter or full year – and the compound annual growth rate over several years.

## Inputs

- Same period last year
- This period
- Same period several years ago
- Years ago

## Results

- Year over year growth
- Absolute change
- Compound annual growth rate since then

## Formula

```
YoY growth = (this period − same period last year) ÷ same period last year × 100
CAGR over n years = (latest ÷ earliest)^(1 ÷ n) − 1
```

## Explanation

Comparing a period with the same period a year earlier removes seasonal effects – December sales are compared with last December, not November. It is the standard way companies report growth.

### How to use the Year over Year Growth Calculator

- **Same period last year**
- **This period**
- **Same period several years ago**
- **Years ago**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the value for the same period last year and this year, and optionally a value from several years ago.

### Tips

- Use the nominal annual rate and pick the compounding frequency your bank or broker states.
- Small differences in return or fees compound into large differences over decades.
- Run the calculation with a cautious, a central and an optimistic return to see the range of outcomes.
- Past returns do not guarantee future returns – nothing here is investment advice.

### Common mistakes to avoid

- Comparing an APR with an APY or effective rate.
- Ignoring inflation, taxes and fees when judging a real return.
- Entering a percentage as a decimal (5 instead of 0.05 is correct here).

### Inputs explained

FieldWhat to enterSame period last yearAmount in your currencyThis periodAmount in your currencySame period several years agoAmount in your currencyYears agoA number

### What each result means

- **Year over year growth** = ([This period] - [Same period last year])÷[Same period last year]×100
- **Absolute change** = [This period] - [Same period last year]
- **Compound annual growth rate since then** = (([This period]÷[Same period several years ago])^(1÷[Years ago]) - 1)×100

### Example values

How the main result changes when **Same period last year** changes and everything else stays at the example values above:

Same period last yearYear over year growth (%)225,000131.11337,50054.07450,00015.56562,500-7.56675,000-22.96900,000-42.22

## Worked example

Inputs — Same period last year: $450,000; This period: $520,000; Same period several years ago: $300,000; Years ago: 4.

Results — **Year over year growth = 15.56 %**; Absolute change = $70,000.00; Compound annual growth rate since then = 14.74 %.

## FAQ

**What is YoY growth?**
The percentage change compared with the same period a year earlier.

**Why use YoY instead of month over month?**
It removes seasonality.

**What is a good YoY growth rate?**
It depends on the business – mature companies grow single digits, startups much faster.

**What formula does the Year over Year Growth Calculator use?**
YoY growth = (this period − same period last year) ÷ same period last year × 100.