How to Use the GRP Calculator
The GRP Calculator enables media planners and marketers to compute the total advertising weight of a campaign across multiple media channels.
- Enter Reach (%) — For each channel, input the percentage of the target population reached at least once.
- Enter Frequency — Input the average number of times reached individuals are exposed to the ad.
- Add Channels — Click “Add Channel” to include additional media placements (TV, radio, digital, print, etc.).
- Read Results — The GRP Calculator displays per-channel GRP and total GRP across all channels.
Formula & Theory — GRP Calculator
The core formula or rule used by the GRP Calculator is shown first, so the explanation that follows can stay tied to the actual calculation:
GRP (per channel) = Reach (%) × Frequency
Total GRP = Sum of all channel GRPsGRP is an additive metric — GRPs from different channels simply add up. A GRP of 100 means you have, on average, reached 100% of the target audience once, or 50% twice, etc.
| GRP Range | Campaign Intensity |
|---|---|
| 50–150 | Light |
| 150–300 | Medium |
| 300–500 | Heavy |
| 500+ | Very Heavy |
Use Cases for the GRP Calculator
- Media Planning — Set campaign GRP targets and allocate budget across channels to hit them using the GRP Calculator.
- Campaign Comparison — Compare GRP across different campaign strategies or time periods.
- Agency Reporting — Present clear GRP metrics to clients as a standardized measure of campaign reach and frequency.
- TV and Radio Buying — Calculate combined GRP across multiple broadcast placements to evaluate overall exposure levels.
- Cross-Channel Analysis — Aggregate GRP from digital, print, outdoor, and broadcast to assess total campaign weight.