About Circumify
A fast, honest circle calculator — built by someone who uses circle math every day.
Sayara Haque Promiti
Architect & Digital Strategist · Founder, Circumify
Sayara Haque Promiti is an architect and digital strategist who works with geometry every day — from curved façades and domes to arcs, columns, and circular layouts. She built Circumify to make everyday circle math fast and reliable for students, builders, and designers.
Who's behind this calculator
Hi, I'm Sayara Haque Promiti — an architect and digital strategist based in Bangladesh. Circle geometry isn't abstract math to me; it's something I work with constantly. Domes, curved walls, arches, columns, rounded floor plans — every one of them comes down to knowing a circle's radius, diameter, circumference, or area, and being able to move between them quickly and accurately.
I built Circumify because I kept reaching for a calculator that did exactly this — convert instantly between any circle measurement, in any unit, without clutter or guesswork. Most tools online were slow, ad-heavy, or only solved one direction of the problem. So I made the one I wanted to use.
What this tool does
Circumify lets you enter any one value — radius, diameter, circumference, or area — and instantly see the other three. It supports metric and imperial units, adjustable precision, and works entirely in your browser (nothing you type is sent anywhere). Whether you're a student checking homework, a maker cutting materials, or a designer laying out a curved space, the goal is the same: a clear answer in one step.
Why you can trust the numbers
Every calculation uses the standard mathematical constants and formulas (C = 2πr, A = πr², and so on) with full floating-point precision under the hood. The formulas are shown openly on the homepage so you can verify the method yourself. If you ever spot something that looks off, I genuinely want to hear about it — reach me at [email protected].
Beyond the calculator
The blog covers the practical side of circle math — how the formulas work, where they show up in the real world, and the small confusions worth clearing up (like the difference between circumference and perimeter). The aim is to be genuinely useful, not just to rank.
Get in touch
Questions, corrections, partnership ideas, or guest-post inquiries are all welcome at [email protected], or through the contact page. You can also find me on the social links below.