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Finance Calc Kit
Business

Year Over Year Growth Calculator

Calculate year-over-year (YoY) growth percentage, absolute change, and comparison metrics instantly.

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Year-over-year growth

+25.00%

Percentage change from the prior year period

Absolute change

+$25,000.00

Dollar difference between periods

Growth factor

1.2500x

Current divided by prior period

How we calculated this

Open to see each step from your inputs to the result.

  1. 1. Calculate absolute change

    Absolute Change=Current−Prior\text{Absolute Change} = \text{Current} - \text{Prior}

    Absolute Change = $125,000.00 - $100,000.00 = +$25,000.00

  2. 2. Calculate YoY growth rate

    YoY Growth %=Current−PriorPrior×100\text{YoY Growth \%} = \frac{\text{Current} - \text{Prior}}{\text{Prior}} \times 100

    YoY Growth = ($25,000.00 / $100,000.00) * 100 = +25.00%

  3. 3. Calculate growth factor

    Growth Factor=CurrentPrior\text{Growth Factor} = \frac{\text{Current}}{\text{Prior}}

    Growth Factor = $125,000.00 / $100,000.00 = 1.2500x

Report tool

What is year-over-year (YoY) growth?

Year-over-year growth compares a metric from the current period to the same period one year earlier. Investors, executives, and analysts use YoY to track revenue, profit, subscribers, or any KPI while smoothing out seasonal spikes that distort month-to-month comparisons. All math runs in your browser.

For consecutive-month momentum, the month-over-month calculator applies the same percentage-change logic across adjacent months. For revenue-specific dashboards, the revenue growth calculator focuses on sales trajectories. When you need a smoothed annual rate across multiple years, the CAGR calculator compounds growth geometrically over longer horizons.

Year-over-year growth formula

YoY growth percentage expresses the change relative to the prior-year baseline:

YoY Growth %=Current Period−Prior PeriodPrior Period×100\text{YoY Growth \%} = \frac{\text{Current Period} - \text{Prior Period}}{\text{Prior Period}} \times 100

The growth factor (multiplier) shows how many times larger the current value is:

Growth Factor=Current PeriodPrior Period\text{Growth Factor} = \frac{\text{Current Period}}{\text{Prior Period}}

Worked example

A business reports $100,000 in revenue last year and $125,000 this year.

  • Absolute change = $125,000 - $100,000 = +$25,000
  • YoY growth = ($25,000 / $100,000) x 100 = +25.00%
  • Growth factor = $125,000 / $100,000 = 1.2500x

Why YoY beats MoM for seasonal businesses

Month-over-month comparisons can swing wildly around holidays, tax deadlines, or weather patterns. YoY compares March 2026 to March 2025, so seasonal peaks align and the trend reflects genuine business progress rather than calendar effects.

Frequently asked questions

What is the difference between YoY and MoM growth?
Year-over-year compares a period to the same period in the previous year (for example, March 2026 vs March 2025). Month-over-month compares consecutive months (March vs February). YoY is preferable for seasonal businesses.
Can YoY growth be negative?
Yes. A negative YoY growth rate means the current period is lower than the same period last year, indicating a decline in performance.
How do I handle a zero prior period value?
When the prior period is zero, percentage growth is undefined because division by zero is invalid. The calculator still shows absolute change but cannot compute a growth rate or factor.
How is YoY growth different from CAGR?
YoY measures change across a single 12-month interval. CAGR is the geometric mean annual growth rate over multiple years, smoothing volatility across the full period.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.