Calculators
Practical tools for planning your investments and financial goals.
Compound interest
See how your investment grows over time thanks to regular contributions and compound interest. Includes an interactive growth chart.
- Initial deposit plus regular contributions
- Adjustable compounding frequency
- Visual chart of investment growth
Mortgage calculator
Compare annuity and linear repayment, set two rate periods, and view totals, charts, and a yearly overview.
- Principal, two rates, and period lengths
- Preset display currencies (CZK, USD, EUR) and a custom symbol
- Debt trajectory over time
Inflation calculator
Enter a constant inflation rate and watch how the purchasing power of the same cash changes over time. Includes a chart and a year-by-year overview.
- Amount today, annual inflation, time horizon
- Preset display currencies (CZK, USD, EUR) and a custom symbol
- Purchasing power vs. nominal amount for the same real basket
FIRE calculator
Plan financial independence with targets based on your withdrawal rate, savings and return assumptions, optional cost and contribution growth — a chart and a detailed yearly table.
- FIRE number from monthly expenses and SWR
- Expense inflation and savings growth (optional)
- Portfolio trajectory vs. target
ETF / DCA calculator
Model monthly purchases into ETFs or funds, see total growth and return, and compare with a lump-sum investment of the same total contribution.
- Optional starting balance plus a fixed monthly amount
- Toggle the classic lump-sum comparison on the chart
- Yearly table: contributed, DCA value, lump-sum path
Dividend calculator
Model your dividend income stream with yield, payout growth, and price growth; toggle DRIP and track the portfolio, cumulative dividends, and a yearly table.
- Starting yield and dividend growth rate
- Optional reinvestment (DRIP)
- Chart: portfolio, dividends, total wealth