Calculate week-over-week percentage change between adjacent weekly values, with absolute change and short-term trend context.
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Compare one week with the next Use this week-over-week calculator to compare revenue, signups, website traffic, or any other weekly metric. It shows both percentage change and absolute change so you can see whether short-term growth is accelerating or slowing.
Formula
(This week value − Last week value) ÷ Last week value × 100
WoW is best for short-term trend checks. Use MoM or YoY when the weekly signal is too noisy or when you need a longer comparison window.
Result
20% WoW
Growth of 200 from 1,000 to 1,200.
WoW change
20%
Absolute change
200
How to read this result
WoW highlights movement between adjacent weeks. It is useful for marketing campaigns, product metrics, and revenue checks because it surfaces recent changes quickly. If you need a less noisy comparison window, use month-over-month or year-over-year growth instead.
Week-over-week calculator guide: measure weekly growth and decline
A week-over-week calculator compares one week's value with the previous week and turns the difference into a percentage change. It is a quick way to see whether weekly revenue, signups, sessions, or other KPIs are moving in the right direction without waiting for a longer reporting cycle.
What week-over-week measures
Week-over-week, often shortened to WoW, compares the current seven-day period with the immediately previous seven-day period. That makes it one of the fastest ways to spot short-term movement in revenue, traffic, signups, orders, or other recurring business metrics.
The tradeoff is that weekly data can be noisy. A promotion, a stockout, a holiday, or a reporting delay can make one week look unusually strong or weak, so the result is best treated as a trend signal rather than a full performance verdict.
The WoW formula and worked example
The formula is straightforward: subtract last week's value from this week's value, divide by last week's value, and multiply by 100. The sign tells you whether the metric grew or declined, while the raw difference shows how much the underlying value changed in its original units.
For example, if weekly signups increase from 1,250 to 1,410, the absolute change is 160 and the WoW growth rate is 12.8%. If the same metric falls from 1,410 to 1,250 the change is still 160 in absolute terms, but the percentage becomes negative because the direction is now downward.
WoW growth = ((This week value - Last week value) / Last week value) × 100
Converts the weekly difference into a percentage.
Absolute change = This week value - Last week value
Shows the raw movement between the two weekly values.
WoW vs month-over-month and year-over-year
WoW is the quickest standard comparison window, which is why it is common in startups, product teams, and marketing campaigns. Month-over-month comparisons smooth out some of the weekly volatility, while year-over-year comparisons are better when you want to reduce seasonal noise by matching the same period in the previous year.
That means WoW is usually the right choice when you care about immediate momentum. If you care about a steadier trend line or need to compare a business cycle that repeats across months or seasons, a longer window will usually be more useful.
A zero last-week value makes the formula undefined because division by zero is not meaningful. Very small baselines can also exaggerate the percentage result, so the raw absolute change should always be read alongside the percentage if the base week is tiny.
WoW also needs context when there is a one-off event such as a flash sale, a product launch, a holiday weekend, or a reporting correction. In those situations, the weekly result may be accurate but still misleading if you treat it as a permanent trend instead of a short-lived spike or dip.
Frequently asked questions
What is week-over-week growth?
Week-over-week growth compares one week's value with the previous week's value and expresses the change as a percentage. It is often used for revenue, traffic, signups, orders, and other weekly business metrics.
How do you calculate week-over-week growth?
Subtract last week's value from this week's value, divide by last week's value, and multiply by 100. The result is the week-over-week percentage change.
What if last week's value is zero?
WoW growth is undefined when the baseline week is zero because the formula would divide by zero. In that case, compare the absolute change instead or choose a different baseline period.
Is WoW the same as month-over-month growth?
No. WoW compares adjacent weeks, while month-over-month compares adjacent months. WoW is faster and more sensitive to short-term movement, while month-over-month is usually less noisy.
Can WoW growth be negative?
Yes. A negative WoW result means the current week is lower than the previous week. That indicates a decline rather than growth.
Can WoW growth be over 100%?
Yes. If this week's value is more than double last week's value, the WoW result will exceed 100%. That can happen when a metric starts from a low baseline and rises quickly.
