CPM Calculator
Fill any two fields — we calculate and animate the third in real time.
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Total Cost
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CPM
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Impressions
Formula
CPM = (Cost ÷ Impressions) × 1000
Enter any two values to solve the third.
Budget sliders
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CPM — answers & formulas
Deep-dive formulas, definitions, and worked examples — indexed for search and ready to share.
Math HistoryScotland · 1617
A Single Dot That Changed Math
John Napier — better known for inventing logarithms — popularized the decimal point in his treatise Rabdologiae. Before that tiny dot, fractions were written as awkward ratios. The decimal point quietly unlocked modern accounting, engineering, and every calculator that followed.
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