All tools
Calculators, converters, generators and checkers — free, fast and checked by our research team. Filter by type or topic to find the right one.
CPC Calculator
Work out cost per click from your budget and clicks — or how many clicks a…
CPM Calculator
Work out cost per mille — the price of 1,000 ad impressions — or the budget…
Margin Calculator
Enter any two of cost, selling price, profit, margin or markup — the calculator fills in…
ROI Calculator
Calculate the return on investment of any project: how much you gained as a percentage of…
Free online tools you can trust
Every tool is built from a documented formula or standard, written by a subject specialist and checked by a second reviewer before it goes live. We show the method under each tool so you can verify the result yourself.
All tools are free, work in your browser and don’t require an account.
- Calculators
- Generators
- Converters
- Checkers
- Planners & timers