About Crictron Calculators

Crictron Calculators is a free suite of online tools built for people in the United States who need a fast, accurate answer — whether that's a mortgage payment, a BMI, a GPA, or the number of days until a deadline.

Our approach

Every calculator on this site is built around a well-established, publicly documented formula: standard loan amortization math for mortgages and loans, the CDC's adult BMI formula for health tools, the Mifflin-St Jeor equation for calorie needs, and the standard U.S. 4.0 grading scale for GPA. We test each tool against known reference values before publishing, and we keep the interface simple: no sign-up, no unnecessary data collection, and no dark patterns.

Privacy by design

All calculations run directly in your browser. The numbers you enter into a calculator are never sent to or stored on our servers. See our Privacy Policy for full details.

Not professional advice

Crictron Calculators provides general, educational estimates. It does not replace advice from a licensed financial advisor, doctor, dietitian, accountant, or attorney. Always confirm important decisions with a qualified professional.

Contact us

Questions, corrections, or a calculator you'd like to see added? Visit our Contact page.