About Circumify
A small site built on a simple idea: math tools should be fast, clear, and free.
Daniel Whitfield
Founder & lead writer
Mathematics writer and former engineering tutor. I build calculators that make geometry click.
Credentials
- BSc in Mathematics, with a focus on applied geometry.
- Eight years tutoring high-school and undergraduate maths and physics.
- Author of explainers featured in classroom resources around the world.
Why we built Circumify
Most of the math calculators online were clearly built fifteen years ago, weighed down by pop-ups and SEO filler, and gave you a number without showing how it was reached. We thought students, teachers, engineers, and curious tinkerers deserved something better: a calculator that loads in under a second, works on any device, and explains the formula so you actually learn something while you use it.
Circumify started as a single circumference tool and is growing into a small library of geometry calculators backed by clear, ad-supported writing. Everything on the site is free and will stay that way.
Get in touch
Have a question, spotted an error, or want to collaborate? Email [email protected] or use the contact form.