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.