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Review Rating Average Calculator

Work out review rating average instantly with clear inputs, formula shown and shareable results.

About Review Rating Average Calculator

A rating average is weighted by review count, so a large existing base is slow to move. The weight of new reviews shows exactly how much influence recent feedback carries.

Formula

Weighted average

Blended = (old average × old count + new average × new count) / total count

Worked example

With the default values below, Review Rating Average Calculator returns Blended Average Rating of 4.211. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current Average Ratingaccepts 1–5
4.1
Number Of Existing Reviewsaccepts 1–10,000,000
320
Average Of New Reviewsaccepts 1–5
4.8
Number Of New Reviewsaccepts 1–10,000,000
60

Results

Blended Average Rating
4.211
Total Reviews
380
Change In The Average
0.111
Weight Of The New Reviews
15.79%

Step by step

  1. 1Values used
  2. 2Weighted average
  3. 3Blended Average Rating= 4.211
  4. 4Total Reviews= 380
  5. 5Change In The Average= 0.111
  6. 6Weight Of The New Reviews= 15.79

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Figures are estimates based on the inputs given. Marketing performance, platform fees and conversion behaviour vary by audience, channel and season. Use this as a planning guide, not a forecast.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Figures are estimates based on the inputs given. Marketing performance, platform fees and conversion behaviour vary by audience, channel and season. Use this as a planning guide, not a forecast.

Frequently Asked Questions

Why does the average move so slowly?

Because every existing review carries equal weight. With 320 reviews, 60 new ones control less than a fifth of the average.

Do platforms weight recent reviews more?

Many rank by recency in display and some weight it in the score, so recent sentiment matters beyond the raw average.

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