Gross Rating Point (GRP) Calculator
Quantify total campaign weight by multiplying the percentage of the total population reached by average exposure frequency.
Calculate Gross Rating Point (GRP)
Gross Rating Point (GRP) Formulas & Reverse Equations
Use these standard and algebraic reverse formulas in spreadsheets, agency decks, or media plans:
Solve for GRP
GRP = Reach Percentage × FrequencySolve for Reach Percentage
Reach Percentage = GRP ÷ FrequencySolve for Frequency
Frequency = GRP ÷ Reach PercentageUnderstanding Gross Rating Point (GRP)
Gross Rating Point (GRP) is the universal currency of broadcast television, radio, out-of-home, and cross-screen media planning. One rating point equals 1% of the total defined universe. By multiplying Reach (%) by average Frequency, GRPs express total gross media weight in a single standardised score.
When to Use Gross Rating Point (GRP)
Use GRP when sizing national or metro broadcast buys, comparing media weight across flights, or balancing high-reach vs high-frequency schedules.
Industry Benchmarks & Planning Context
A 200 GRP schedule could be achieved by reaching 50% of the market an average of 4 times (50 × 4 = 200 GRPs) or 80% of the market 2.5 times (80 × 2.5 = 200 GRPs).
Frequently Asked Questions About GRP
How do you calculate Gross Rating Points (GRP)?
Multiply the percentage of the total universe reached (expressed as a whole number from 0 to 100) by the average exposure frequency: GRP = Reach (%) × Frequency.
Can GRPs exceed 100?
Yes! Because GRP multiplies Reach (%) by Frequency, any campaign where Reach × Frequency exceeds 100 will have more than 100 GRPs. Reaching 60% of the audience 3 times equals 180 GRPs.
What is the difference between GRP and TRP?
GRP measures reach against the entire general population (or all TV households), whereas TRP (Target Rating Point) — also known as TARP in Australia and New Zealand — measures reach strictly within your defined target demographic (e.g. People 25–54).