# Free PSA and media calculators

> Free calculators for donated media value, GRP and CPM. Each one shows its formula, labels results as estimates and exports what you entered.

Source: https://psareach.com/tools/

Calculators

Three calculators for nonprofits and their agencies. Each one shows its formula and labels its results as estimates, and you can export what you entered.

-   ## [Donated media value calculator](https://psareach.com/tools/donated-media-value-calculator/)

    What was the donated airtime worth?

    `Estimated value = Σ spots × estimated unit rate`

    You enter

    -   Spots by station, daypart or length
    -   Estimated unit rate for each row
    -   Optional impressions per spot

-   ## [GRP calculator](https://psareach.com/tools/grp-calculator/)

    How much advertising pressure did the schedule deliver?

    `Estimated GRP = gross impressions ÷ universe × 100`

    You enter

    -   Gross estimated impressions
    -   Audience universe
    -   Or a list of rating points

-   ## [CPM and impressions calculator](https://psareach.com/tools/cpm-calculator/)

    Is the value plausible for the audience delivered?

    `CPM = value ÷ impressions × 1,000`

    You enter

    -   Estimated value
    -   Estimated impressions
    -   Or solve for impressions from a CPM

## How to read the results

The calculators do arithmetic on the numbers you enter. Use them as a quick check. A valuation of your campaign starts from verified airings.

[Read the methodology](https://psareach.com/methodology/)

1.  ### Every result is an estimate

    The rates, impressions and CPMs you enter are estimates, so the results are too. They're labeled that way on screen and in the export.

2.  ### Keep spot lengths apart

    Enter :15, :30 and :60 airings on separate rows with their own rates. Length changes the value, not the audience.

3.  ### Test the rate before you publish

    For a report or a grant application, check how much the total moves with a lower and a higher rate, and state the rate basis.

## Guides behind the formulas

[All guides](https://psareach.com/insights/)

-    [Donated media value ### How to calculate donated media value A step-by-step method for valuing donated PSA airings: rate evidence, commercial-equivalent rates, spot length, a CPM cross-check and honest labeling. 9 min read](https://psareach.com/insights/how-to-calculate-donated-media-value/)
-    [Measurement ### How reach and frequency are calculated for PSA campaigns What reach and frequency mean for a PSA campaign, the formulas that link them to GRP and impressions, and how to use them to plan and report. 7 min read](https://psareach.com/insights/how-reach-and-frequency-are-calculated/)
-    [Methodology ### Measured vs estimated impressions: how to report responsibly Why PSA impressions are usually estimates, how they are modeled from ratings and universe data, and how to label and present them honestly. 9 min read](https://psareach.com/insights/measured-vs-estimated-impressions/)

## Want the real numbers, airing by airing?

We start from verified airings and give you value and audience, labeled estimated, with the method named.

[Talk to PSAReach](https://psareach.com/contact/) [See a sample report](https://psareach.com/sample-report/)