About CalcEngine

What is CalcEngine?

CalcEngine is a free collection of browser-based calculators: payment and marketplace fees, pricing and commission, everyday math, electrical sizing and energy cost, and a set of developer tools. Every calculation runs in your browser — no account, no server round-trips.

Each calculator shows its formula, the assumptions behind it and worked examples. Where a result depends on outside rules — a processor's fee schedule, an electrical code table, a utility price — the page names the source and the date it was last checked.

Who built it?

CalcEngine is designed and maintained by Vik Thomas, a software engineer and web developer with experience across backend systems, APIs, and developer tooling.

Vik runs Lamill Web Systems — a small, independent web studio that builds fast, focused tools for developers and technical audiences. CalcEngine is one of several projects under that umbrella.

Why CalcEngine?

The existing options were either buried inside expensive SaaS dashboards or required copy-pasting values into a spreadsheet. CalcEngine exists because these calculations should be a URL away — shareable, fast, and free.

Every calculator on the site is written from scratch: correct formulas, sensible defaults, clear limits on what it does not model, and output that is useful for a real decision.

Privacy & data

Nothing you enter is sent to a server. All calculations happen in your browser. No cookies, no analytics, no behavioural tracking. Read the full Privacy Policy for details.

Get in touch

Spotted a bug, want a calculator added, or just have feedback? Reach out via lamill.io.