About Renderlog Calc

What we make

Renderlog Calc is a collection of 49 (and growing) free online calculators covering finance, health and body, dates and time, education, everyday math, and unit conversion. Every tool is designed to solve one problem well — fast enough to use during a phone call, clear enough to trust the answer.

How we're different

• Private by design. Every calculation runs in your browser. We never send your inputs (salary, weight, date of birth) to a server.
• No signup, no paywall. Every calculator is fully free. We don't put ads in the result area.
• Accurate formulas. Reducing-balance EMI, Mifflin-St Jeor BMR, Naegele pregnancy dating, US Navy body fat — the same formulas used by banks, clinicians, and dietitians.
• Mobile-first. Tools work on a 5-inch phone screen as well as on a desktop.

What we deliberately don't build

We avoid calculators whose rules change every year — income tax, country-specific payroll, live crypto prices. The answer stops being correct the moment the rules change, and that's worse than having no answer at all. If we ship something, we intend to keep it accurate.

Contact

Found a bug or want a calculator added? Email hello@calctool.in.