Calcora

Calcora is an offline-first all-in-one calculator toolkit. Use the basic calculator right from the home screen or choose a specialized tool for your needs. View formulas, detailed breakdowns, and assumptions, then copy, save, or recalculate results. **Basic Calculator** Addition, subtraction, multiplication, division, parentheses, percentages, squares, and square roots, with standard operator precedence. Division by zero and invalid expressions display clear error messages. **Money & Business** Percentages, successive discounts, profit and gross margin, tax calculations (tax-inclusive and tax-exclusive), and bill splitting. Successive discounts are calculated multiplicatively, and bill splitting uses cent-level rounding to ensure the shares add up to the original amount. **Date & Time** Date intervals, date addition and subtraction, countdowns, age and birthdays, working days, and work hours. Month-end overflow adjusts to the last day of the target month. Work-hour calculations support overnight shifts. **Unit Converter** Length, weight, area, volume, temperature, speed, time, data storage, power, energy, and pressure. Temperature uses dedicated conversion formulas. KB and KiB follow decimal (1000-based) and binary (1024-based) standards, respectively. **Financial Estimates** Compound interest, regular investments, equal-payment and equal-principal loan repayment, and inflation-adjusted purchasing power. Results are mathematical estimates based on your inputs and do not constitute investment advice. **Productivity & Science** Hourly wages, task duration, productivity, scheduling, averages, ratios, sequence sums, equations, powers and roots, logarithms, and trigonometric functions. **History & Data** Calculation history, favorites, and reusable templates, with JSON and CSV import/export. Your data stays on your device, and failed imports will not overwrite existing data. No registration, internet connection, ads, or subscriptions required. Ready to use offline right after installation.