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04 / 2025

Výpočtář

Eight practical calculators and converters without registration or unnecessary steps.

Role
Product design and development
Period
2025
Výpočtář practical calculator interface
Výpočtář / real product

01

What it solves

Everyday calculations are often scattered across ad-heavy pages. Výpočtář brings them into one direct, readable interface.

02

My work

I designed and implemented the calculation logic, forms, responsive interface and exchange-rate integration.

Product character

Eight tools without filler

Every element below refers to a verified part of the project.

  1. UnitsEight tools
  2. CurrenciesExchange rates
  3. VATEight tools
  4. BMIEight tools
  5. MortgageEight tools
  6. FuelEight tools
  7. RetirementEight tools
  8. InterestEight tools

03 · Principle

One tool, one clear task.

Each calculator opens directly to inputs, calculation and result. There is no registration, social feed or other step unrelated to the task.

04 · Implementation

Calculation is separate from the form.

Calculation functions live outside interface components. Currency conversion also accounts for an external rate source and an explicit fallback when data is unavailable.

Výpočtář mobile home page with the calculator and converter list

Technical view

Verified structure

  1. Eight toolsConversions, finance and personal calculations
  2. Direct interfaceNext.js 14, React 18 and Tailwind CSS 3.4
  3. Exchange ratesExternal ExchangeRate API
  • Next.js 14
  • React 18
  • TypeScript
  • Tailwind CSS 3.4
  • Lucide React
  • ExchangeRate API
Visit website ↗Source code ↗
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