Marketing calculators
Every marketing number here is a ratio between money spent and something that happened, and the interesting question is always the denominator. What counts as a conversion, measured over what window, credited to which touch. The arithmetic is the easy part and it is not where the disagreements are.
ROAS CalculatorReturn on ad spend, plus the break-even ROAS your margin actually requires. A 4× ROAS is a loss at a 20% margin.CPC CPM CPA CalculatorThe three cost metrics from one campaign, with the funnel rates that connect them. Improving cost per acquisition is usually a conversion-rate problem rather than a bidding one, and this shows which.Ad Budget CalculatorAd budget worked backwards from a revenue target. The test is not whether the campaign returns more than it costs, but whether the gross profit per order exceeds the cost of acquiring it.Conversion Rate CalculatorConversion rate with the value per visitor, which is the figure that decides how much traffic is worth buying. One extra percentage point is usually worth more than any plausible traffic increase.A/B Test Sample Size CalculatorSample size per arm for a two-proportion test. The inverse-square relationship is the insight: halving the detectable effect quadruples the sample you need.A/B Test Significance CalculatorA/B test significance by a two proportion z test. The p value is the probability of seeing data this extreme if the variant made no difference, which is not the probability that the variant works, and reading it the second way is how underpowered tests ship as wins.Funnel Conversion CalculatorStep-by-step and end-to-end funnel conversion, with the weakest step identified. Rates multiply rather than average, so one bad step caps everything downstream.Email Marketing ROI CalculatorEmail campaign returns through the full funnel. Three rates multiply, so respectable-sounding figures at each stage compound into well under one percent of the list ordering.Influencer Campaign ROI CalculatorInfluencer campaign return through engagement, clicks and conversion. Follower count is the least important input, which is the opposite of how these deals are usually priced.SEO ROI CalculatorSEO return with the ramp modelled. Gains arrive gradually, so a calculation using the end-state traffic across the whole period overstates the return by roughly half.