Online Marketing Metrics is a free library of marketing calculators and tools built to make everyday marketing maths fast, accurate and accessible to everyone — from solo founders and freelancers to in-house teams and agencies.
What we do
We publish browser-based calculators covering ROI and analytics, paid advertising, social media, email, SEO and content marketing. Every tool runs entirely in your browser, returns an instant result, and is paired with a plain-English explanation of the formula and what a healthy number looks like.
Why we built this
Marketers spend too much time rebuilding the same spreadsheets. We wanted a single, reliable place to calculate the metrics that actually drive decisions — without logins, paywalls or clutter — so you can get an answer and get back to work.
Our commitment
- Free to use, with no account required.
- Clear formulas and benchmarks alongside every calculator.
- Tools that are reviewed and updated over time.
- Your inputs stay on your device.
Have a suggestion or found an issue? Visit our Contact page — we read every message.