TV advertising can be bought nationally or regionally, with national campaigns allowing ads to reach audiences across all regions. The cost of a TV ad campaign is based on the cost per thousand (CPT) impacts, where one impact is one person viewing an ad. To calculate a TV budget, determine the number of impacts needed to reach the target audience, multiply that by the CPT, and divide by 1000. Standard national campaigns aim for 3 times the universe of the target audience. An example calculates a budget of around £959,740 for a campaign targeting 20 million impacts to housewives with children based on a CPT of £47.67 per thousand impacts.