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Personal finance calculators

Inflation erodes the real value of money. The 50/30/20 budget rule splits take-home pay into needs, wants, and savings. The time value of money shows what a future sum is worth today, the DTI ratio measures debt burden, and an emergency fund of 3–6 months of expenses shields you from unexpected costs. Pick a calculator below.

Personal finance in practice

Inflation is the sustained rise in the general price level, gradually reducing the purchasing power of money. At 5% annual inflation, PLN 10,000 loses more than 38% of its real value over 10 years. Tracking the CPI (Consumer Price Index) helps you judge whether a savings deposit rate actually outpaces inflation. The 50/30/20 budget rule is a straightforward framework for managing household finances. It allocates 50% of net income to fixed needs (rent, utilities, groceries), 30% to discretionary spending (entertainment, dining out), and 20% to saving or debt repayment. Consistently following this split makes it easier to avoid lifestyle inflation and build wealth steadily. The time value of money is a core principle in finance: a zloty available today is worth more than the same zloty in the future because it can be invested and earn a return. Present-value and future-value calculators help assess investment profitability and compare loan or mortgage offers on an equal footing. The DTI (Debt-to-Income) ratio expresses monthly debt obligations as a percentage of gross monthly income. Polish banks typically require a DTI below 40–50% when assessing creditworthiness. A high DTI limits borrowing capacity and increases financial risk for a household. An emergency fund is a liquid cash reserve covering 3–6 months of essential living expenses. It should be kept in a savings account or short-term deposit with instant access, providing a buffer against sudden job loss, unexpected repairs, or unplanned medical costs. Our personal finance calculators help you evaluate each of these areas and make informed financial decisions.

See also: Salary and payroll calculators · VAT calculators · Loan calculators

Frequently asked questions

How does inflation affect savings?

If a deposit yields less than inflation, the real value falls despite nominal growth.

What is purchasing power?

The quantity of goods and services you can buy with a given amount. Inflation reduces it.

How do I calculate the real value of savings?

Real value = nominal / (1 + inflation)^years. The inflation calculator does it for you.

Consumer Price Index — a basket of goods and services reflecting consumer inflation (GUS in Poland).

Yes — an investment yielding more than inflation protects real value. Inflation-linked bonds are one option.

Through interest rates — higher rates constrain credit and consumption, cooling price growth.

Real rate ≈ nominal − inflation. It shows the actual increase in purchasing power.

No — the result is gross. Interest income from deposits is subject to a 19% Belka tax.

Inflation = rising prices; deflation = falling prices. Deflation is also dangerous — it delays spending and investment.

Regularly review your budget, index your expenses and look for investments with real returns > inflation.