CalcHub
100% Free • Privacy-First • Independent

About CalcHub

Fast, accurate, zero-signup online calculators designed for clarity, privacy, and speed.

Built by Ayush Guleria — Solo Developer

Meet Ayush Guleria — Creator of CalcHub

ayushguleria73@gmail.comSend Feedback

Why I Built CalcHub as a Solo Project

Hey! I’m Ayush Guleria, the independent software engineer behind CalcHub. Like many of you, I got tired of using online calculators that were bloated, slow to load, filled with forced email signups, hidden paywalls, or broken on mobile screens.

I built CalcHub as a clean, high-performance alternative: a 100% free suite of calculators designed for speed, simplicity, and absolute privacy. There are no mandatory user accounts, no hidden fees, and zero server tracking of your numbers.

Have feedback, a feature idea, or a new calculator request? Feel free to reach out directly to me at ayushguleria73@gmail.com.

Lightning Speed & Zero Bloat

Built with modern Next.js static architecture for sub-second page loads.

100% Browser Local Math

Calculations run on your device. Your financial or health data never touches a server.

Peer-Reviewed Formulas

Verified against CDC, NIH, IRS tax models, and published clinical studies.

Our Core Engineering Principles

CalcHub was built to demonstrate that essential web tools do not need to be bloated with mandatory account creation, intrusive popups, or heavy tracking scripts. Here is how we build every calculator:

1. Mobile-First Responsiveness

Every component is built baseline for 375px smartphones with 44px+ touch targets and automatic numeric keyboards.

2. Mathematical Transparency

We publish worked step-by-step mathematical examples, formulas, and common pitfalls for every calculator.

3. Client-Side Privacy

Math runs 100% locally in JavaScript inside your browser. We never collect or save your inputs.

Accuracy & Methodology Standards

Our health and body composition tools implement clinically peer-reviewed formulas, including the Mifflin-St Jeor equation, Katch-McArdle body density model, and official US Navy Body Fat circumference equations. Financial tools utilize standard compound interest algorithms and up-to-date state/federal tax bracket brackets.