About

NumerSpace is an independent tool site offering 140+ free online calculators covering finance, health, career, marketing analytics, time, faith, astrology, and everyday life. Every calculation runs in your browser; none of the data you enter (weight, salary, birth date, etc.) is ever sent to or stored on a server.

Our goal is to make inflation calculations, loan payments, deposit returns, dividend yields, VAT and withholding deductions, BMI, calorie needs, and many more calculations fast, accurate, and completely free for everyone.

How We Build Our Calculators

Every calculator's formula rests on established sources in its field: finance tools use the standard PMT (equal installment) formula and Turkey's official CPI series from TCMB/TÜİK, health tools use scientifically validated equations like Mifflin-St Jeor and WHO guidance, and tax and salary tools use current-year parameters from SGK and GİB. On pages where a rate can change (VAT, withholding tax, rent increase caps), we show a visible "last verified" date and link to the official source.

Blog Content and Sourcing Policy

Our blog posts are researched against academic studies and official data before writing; for example, our reading-speed guide is grounded in a peer-reviewed review (Rayner et al., 2016), and our metabolism guide in a study published in Science. Every cited claim is linked to its primary source wherever possible. Content goes through an organizational editorial process; we do not credit a personal byline, but we do not hide our sources either.

Calculation Accuracy

Financial, health, and legal calculations are for informational purposes only and are not personalized advice. We recommend consulting the relevant professional (a bank, physician, or accountant) before making investment, treatment, or legal decisions. Tax rates and regulations can change over time; if you spot outdated information, please let us know.

Correction Policy

If you notice an error, an outdated rate, or an incorrect citation in a calculator or article, reach out through the contact form below. Reported issues are reviewed and the relevant page is updated when needed; when content is updated, the page's "last updated" date is refreshed as well.

Contact

For suggestions, bug reports, or collaboration, please use our contact form.