Free Tools

Marketing math, without the spreadsheet

The calculators, generators and analyzers we use with our own clients — free, instant, no signup. Built by Kortex.

Calculators

CalculatorsROAS CalculatorCalculate your Return on Ad Spend in seconds. Enter ad spend and revenue to see your ROAS and what it actually means for profitability.CalculatorsBreak-Even ROAS CalculatorFind the minimum ROAS your ads need to hit before losing money. Based on your real gross margin — the number most brands never calculate.CalculatorsCAC CalculatorCalculate your Customer Acquisition Cost: total marketing and sales spend divided by new customers won. Know exactly what a customer costs you.CalculatorsCustomer LTV CalculatorCalculate customer lifetime value from average order value, purchase frequency and customer lifespan — plus your LTV:CAC ratio.CalculatorsMarketing Budget CalculatorHow much should you spend on marketing? Calculate a monthly and annual budget from your revenue and growth stage in seconds.CalculatorsCPM CalculatorCalculate CPM, total cost, or impressions — enter any two values and solve the third. The standard formula for pricing ad reach.CalculatorsCPC CalculatorCalculate cost per click, total spend, or clicks — enter any two and solve the third. Essential math for paid search and social.CalculatorsCTR CalculatorCalculate click-through rate from clicks and impressions — or find the clicks or impressions needed to hit a target CTR.

Generators

GeneratorsUTM BuilderBuild clean, consistent UTM tracking URLs with source, medium and campaign presets. Stop guessing where your traffic actually comes from.GeneratorsMeta Tag GeneratorGenerate SEO title, description, Open Graph and Twitter Card tags — with live Google and social previews and copy-paste HTML.

Analyzers

AnalyzersAd Character CounterLive character counts against real ad limits: Google RSA, Meta, TikTok and LinkedIn. Never get truncated mid-promise again.AnalyzersEmail Subject Line TesterScore your email subject line 0–100: length, spam triggers, caps, punctuation, emoji and personalization — with concrete fixes.AnalyzersInstagram Engagement Rate CalculatorCalculate your real Instagram engagement rate from likes, comments and followers — averaged across posts, with benchmarks by account size.