What this site is about
prozentrechner-online.com is a free online tool for percentage calculations. Rather than just returning a number, our calculators show the full step-by-step working – the formula, the values used and each individual step. That way a result can be not only used, but also understood and followed for homework, training, study or work.
What the site offers
The structure is deliberately simple. It centres on five calculators and a formula reference:
- Main percentage calculator – the five standard percentage questions, including percentage change
- Discount calculator – sale prices, stacked coupons and total savings
- VAT calculator – net to gross and gross to net, including the “VAT trap”
- Rule of three calculator – direct and inverse proportion
- Percentage difference – symmetric comparison of two values
- Salary raise calculator – new pay as hourly, monthly and annual figures
- Formulas & learning guide – every formula with examples and memory aids
Our principles
We built the site around a few simple principles:
- Free and without registration. No sign-up, no user accounts, no paywall.
- Ad-free. No advertising networks, no pop-ups, no distractions.
- Privacy-friendly. No cookies, no tracking and no analytics services. Your input never leaves your browser.
- Explainable. Results are always explained with the working and the formula.
- Bilingual. Every calculator is available in German and English.
Who the site is for
The calculators are for anyone who needs to work with percentages quickly and reliably day to day: school students, apprentices, university students, teachers, and people working in retail, accounting and administration. The tools also help in everyday private situations – shopping, rent increases or comparing quotes.
Transparency and limits
We aim for correct formulas and reviewed content. A calculator is still a calculation tool however: it does not replace legal, tax or financial advice, and results should be verified independently before an important decision. See ourterms & conditions for details.
Contact
Questions, bug reports and suggestions are welcome – the quickest route is email tokontakt@prozentrechner-online.com. More options are on ourcontact page.