Everything you need, nothing you don't
A growing library of well-documented calculators, each ready to embed and optimized for the web.
Instant Results
Every calculation runs client-side for zero-latency answers as you type.
One-Line Embeds
Drop any calculator into your site with a single script tag or web component.
Finance Tools
Mortgage, loan, compound interest and more — accurate to the cent.
Developer Utilities
Hashing, encoding, and conversion tools built for engineers.
100% Private
No accounts, no tracking of your inputs. Everything stays on your device.
Mobile First
Responsive, touch-friendly interfaces that work on any screen size.
Start with a favorite
Hand-picked calculators our visitors use most.
Compound Interest Calculator
Calculate compound interest on your investments with our free online calculator
Mortgage Calculator
Calculate monthly mortgage payments, amortization, and total interest with our free calculator
SHA1 Hash Generator
Generate SHA1 hashes from text input with our free online tool
BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight and see your weight category
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text, with support for standard and URL-safe encoding
Amortization Calculator
Generate a full loan amortization schedule and see your monthly payment, total interest, and payoff timeline