About

NumerSpace is an independent site with 97 free online calculators for finance, health, career, marketing analytics, time, faith, astrology and everyday life. Every calculation runs in your browser. The data you enter (weight, salary, birth date and so on) is not sent to or stored on our server. A few tools that show currency, gold or crypto prices or prayer times fetch live data from outside services directly from your browser; the prayer-time tools send the city and date you pick to that service.

The aim is to keep calculations such as inflation impact, loan payments, deposit returns, dividend yield, VAT and withholding deductions, BMI and calorie needs in one place, free for anyone to use.

How We Build Our Calculators

Each calculator's formula comes from established sources in its field. Finance tools use the standard PMT (equal installment) formula and Turkey's official CPI series from TÜİK. Health tools rely on established equations such as Mifflin-St Jeor and on WHO guidance. 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), the page shows a "last verified" date and links to the official source.

Blog Content and Sourcing Policy

Blog posts are prepared by checking academic studies and official data on the topic. For example, the reading-speed post is based on a peer-reviewed review (Rayner et al., 2016), and the metabolism post on a study published in Science. Every cited claim links to its primary source wherever possible. Content goes through an organizational editorial process. Posts carry no personal byline, but the sources are not hidden.

Calculation Accuracy

Financial, health, and legal calculations are for informational purposes only and are not personalized advice. Talk to the relevant professional (a bank, physician or accountant) before making an investment, treatment or legal decision. Tax rates and regulations can change over time. If you spot outdated information, let us know.

Correction Policy

If you notice an error, an outdated rate, or an incorrect citation in a calculator or article, write to us through the contact form. Reported issues are reviewed and the page is updated when needed. When content is updated, the page's "last updated" date changes too.

Contact

For suggestions, bug reports or collaboration, use the contact form.