Energy · 7 min
Find out whether investing in solar panels in Poland in 2026 is still profitable. We calculate PV payback periods, review grants, and show how to use the solar calculator.
· Redakcja Liczbnik
Health · 6 min
Learn what BMR and TDEE are, how to calculate them, and how to use these metrics to plan your diet and change your weight. Practical examples and a free calculator.
· Redakcja Liczbnik
Taxes · 6 min
How should an entrepreneur understand the difference between net and gross prices? We explain VAT rates, how to calculate tax, and the most common invoicing mistakes.
· Redakcja Liczbnik
Business · 7 min
Learn what fixed assets are, which depreciation rates apply in Poland in 2026, and how to calculate straight-line and declining-balance depreciation. Examples and calculator.
· Redakcja Liczbnik
Finance · 6 min
The price of mandatory OC car insurance in Poland varies widely in 2026. Find out which factors affect your premium and how to legally save hundreds of PLN per year.
· Redakcja Liczbnik
Salaries · 6 min
Step-by-step guide to calculating your net (take-home) salary in Poland in 2026: ZUS, NFZ, PIT, youth relief, and the tax-free allowance explained.
· Liczbnik Editorial
Business · 7 min
A detailed comparison of sole-trader B2B versus standard employment contract (UoP) in Poland 2026: taxes, ZUS contributions, health insurance and real take-home figures.
· Liczbnik Editorial
Science · 5 min
How to convert between Celsius, Fahrenheit and Kelvin temperature scales: formulas, comparison tables and practical everyday examples.
· Liczbnik Editorial
Finance · 6 min
Learn the difference between compound and simple interest, understand the formula, the Rule of 72, and see real examples of capital growth over 20 years.
· Liczbnik Editorial
Finance · 7 min
How much does a car really cost per month in Poland in 2026? A full Total Cost of Ownership breakdown: fuel, insurance, servicing, depreciation and parking.
· Liczbnik Editorial
Finance · 6 min
Learn how Polish sick pay (zasiłek chorobowy) is calculated in 2026, what percentage of salary you receive on L4, and who pays the benefit.
· Liczbnik Editorial
Finance · 7 min
Understand how ZUS calculates your retirement pension in Poland, what pension capital is, when it pays to retire later, and how to forecast your own benefit.
· Liczbnik Editorial