About Calculator Wizard

Hi, I'm Devon T — welcome to Calculator Wizard.

I'll say this upfront: I'm not a math teacher, and I'm not a finance professional. I decided to build this site based on my own needs and the things I found myself researching over and over.

After noticing how many times I'd Googled my way onto someone else's calculator site, I had a simple thought: why not just build my own? My ambition grew from there — the site expanded well beyond my original needs as I started learning to code with the help of AI. Many of the scripts here are AI-generated, but the process of learning HTML along the way has been genuinely exciting, and challenging in the best way.

Why "Wizard"?

Not because I'm an expert. It's because I want using this site to feel a little like magic — type in your numbers, get a clear answer, and actually understand the "why" behind it, not just a black-box result.

What I Actually Care About

• Every formula on this site is checked and verified, not guessed at
• Every calculator shows its work — not just a number, but the formula and a real worked example
• No account required, no paywall, no clutter

What We Offer

A growing collection of free tools, including:

• Percentage Calculator (percent of, discount, percent change, and more)
• Percentage Difference Calculator
• Percentage Point Calculator
• Markup Calculator
• Grade Percentage Calculator
• Sales Tax Calculator
• Tip Calculator
• Traditional Basic & Scientific Calculators

Alongside the calculators, the Guides section covers how percentages actually work in real situations — pay raises, tipping, GPA, compound interest, and more — with worked examples rather than just formulas.

Still Growing

I look forward to growing this site further, and hopefully helping people build real math confidence the same way similar sites have helped me over the years. If there's a calculator you wish existed, or something that looks wrong, reach out — I read every message.

Cheers!
— Devon T