Free calculators, converters & generators, all in one place.
From BMI and mortgage calculators to JSON formatters and QR code generators — 50+ tools across finance, health, productivity, and more. No installs, no sign-ups.
Popular tools
The tools people reach for most.
What makes CalcLake different
Every tool is built to be fast, private, and easy to find — no matter what you're calculating or converting.
No paywalls, ever
No premium tier, no paywalled results, no credit card. Every calculator, converter, and generator here is free to use.
No account required
Open any tool and start immediately. There's nothing to sign up for, verify, or remember a password for.
Runs in your browser
Most tools calculate locally on your device, so numbers like your income or health data aren't uploaded to get a result.
Loads instantly
Every tool page is prebuilt in advance, so it opens instantly — no loading spinner between you and your answer.
Organized by category
50+ tools sorted into 9 categories — Calculators, Finance, Health & Fitness, Date & Time, Productivity, Text & Writing, Image & Design, Developer Tools, Utilities — so you browse by topic instead of scrolling.
Always growing
New calculators and converters are added regularly, based on the tools people actually search for.
Everything you need to know
Real questions about pricing, privacy, and how the tools actually work.