Free Calculators
Interactive tools for planning and pricing your software stack. Every calculator runs entirely in your browser — instant results, no signup, and nothing you type is sent to us.
SaaS Subscription Cost Calculator
Add up every tool in your stack and see the monthly, annual, and 3-year total — plus what annual billing would save you.
Open calculatorEmail Marketing ROI Calculator
Turn your list size, open rate, click-through rate, and conversion rate into monthly revenue, ROI, and revenue per subscriber.
Open calculatorPassword Strength Checker
Measure a password's entropy in bits and how long it would take to crack. Computed locally in your browser — nothing is sent anywhere.
Open calculatorNumbers first, then the tools
Picking software is easier once you know the maths. Total up what you already spend, work out what a channel actually returns, and only then go shopping. These calculators handle the first two steps; the rest of the site handles the third.
When you are ready to choose, browse our expert-tested tool reviews, put two options head-to-head, or start from a curated best-of list.