About Numlight

Last updated October 14, 2026

Numbers, made clear. Numlight builds free calculators for the big money decisions — starting with buying a home — that are accurate, fast on any phone, and honest about how they work.

What makes Numlight different

We show our work. Every result comes with the formula, the assumptions and the sources behind it.
Private by design. Calculations run in your browser. No sign-up, no email, no personal information.
Tested math. Our calculation engine is shared by every page and checked against hand-verified examples before each release.
Real data. State pages use official sources such as the US Census Bureau, with the year and method stated.
AI that explains, never invents. Our AI assistant runs the same calculators you do and explains the result. It doesn't make up numbers.

Our calculators

How we make money

Numlight is free to use. In the future we may show advertising or clearly labeled partner offers. Those will never change a calculator's result. See our editorial policy.

Contact

Found a bug or a number that looks wrong? We want to know: [email protected].