Kalkul - All in One Calculator

Kalkul is a modern, all-in-one calculator app designed for everyday use. Clean, fast, and packed with powerful tools — everything you need in a single app.

🧮 CALCULATOR
- Full expression-based input — see the full formula as you type
- Scientific functions: sin, cos, tan, log, ln, √, xⁿ, π, e, factorial
- Fraction display: see results as 1/3 alongside 0.333...
- Calculation history with slide-up panel
- Configurable keyboard layout

📐 UNIT CONVERTER
- 17 categories: Length, Area, Volume, Mass, Speed, Temperature, Pressure, Energy, Power, Data, Time, Angle, Frequency, Fuel Efficiency, Current, Voltage, Force
- Live conversion as you type
- Favorite units and usage-based sorting

🛠️ 16 BUILT-IN TOOLS
- 📅 Date Calculator — date difference, add/subtract days, countdown, age calculator
- 🌍 Time Zone Converter — live clocks for any city, drag to reorder
- ⚖️ BMI Calculator — BMI, BMR, TDEE, body fat %, ideal weight range
- 💱 Currency Converter — daily updated rates, 30+ currencies with flags
- 🏷️ Discount Calculator — standard, reverse, and stacked discounts
- 🧾 Sales Tax — add or remove tax with preset rates
- ⛽ Fuel Cost — calculate trip fuel cost in metric or imperial
- 🚗 Fuel Efficiency — convert MPG, L/100km, km/L, compare vehicles
- 🎓 Grade Average — weighted GPA, goal grade calculator
- 💻 Hex Converter — BIN / OCT / DEC / HEX with bitwise operations
- 🏦 Loan Calculator — monthly payment, amortization table, early payoff
- 🌸 Ovulation Calculator — fertile window, cycle calendar
- 🐷 Savings Calculator — compound interest projections, what-if scenarios
- 🛒 Unit Price — find the best value between products
- 🌡️ Temperature — 8 scales including Kelvin, Rankine, Delisle
- ⚡ Speed — m/s, km/h, mph, knots, Mach and more

🎨 DESIGN & CUSTOMIZATION
- 6 color themes + Material You dynamic color (Android 12+)
- Light, Dark, and AMOLED pure black mode
- 3 languages: English, French, Arabic (with full RTL support)
- Configurable number formatting: separators, precision, Indian numbering
- Haptic feedback, keep screen on option

💾 BACKUP & RESTORE
- Export and import your data as a .kalkul file
- Saves history, favorite units, and time zones

Kalkul works fully offline. Currency rates are fetched once per day and cached automatically — no account or subscription required.