About SumKit

SumKit is a free collection of online calculators, converters and generators. We started with a simple idea: the tools people search for every day — a mortgage calculator, a word counter, a QR code generator — should be fast, free and easy to trust.

What we offer

Our site currently offers 19 free tools in four categories:

• Finance Calculators (9): loan, mortgage, compound interest, salary, percentage, refinance, auto loan, personal loan and car insurance estimate tools.
• Text Tools (3): word counter, case converter and password generator.
• Everyday Calculators (4): age, date, unit converter and BMI calculator.
• Generators (3): QR code, color palette and username generator.

How our tools work

Every tool runs entirely in your web browser using JavaScript. Nothing you type into a calculator is uploaded to a server, stored or sold. Our finance calculators use the same standard formulas that lenders and financial professionals use, and every tool page explains the formula in plain English so you can check the result yourself.

Accuracy and limits

We work hard to keep our tools accurate, but every result is an estimate. Loan and insurance figures depend on your lender, insurer, location and personal circumstances, and they will differ from official quotes. Nothing on this site is financial, tax, legal or medical advice. Please read our Disclaimer for full details.

Get in touch

Found a bug, or have an idea for a new tool? We would love to hear from you — visit our Contact page.

Last updated: November 2026