CalcOS is your all-in-one calculator and converter toolkit - 100+ fast, accurate tools in one clean, lightweight app. From home-loan EMIs to land measurement, it handles the calculations that matter most.

FINANCE & MONEY
- Loan EMI calculator for home loans, car loans and personal loans
- Mortgage calculator with full interest and payment breakdown
- SIP, compound interest and FD/RD calculators for investments
- Retirement and stock-return planners
- GST and income-tax estimators
- Discount, profit-margin and tip calculators

LAND & PROPERTY
- Land Area Converter with region-wise Bigha, Katha and Biswa
- Acre, Hectare, Square Yard, Square Feet, Guntha, Cent and more
- Ideal for real-estate deals and property measurement in India

CONVERTERS
- Length, weight, volume, area, speed, temperature and live currency

EVERYDAY & UTILITIES
- Age, date, fuel economy, electricity cost and paycheck calculators

HEALTH & FITNESS
- BMI, calorie/TDEE, body fat, water intake and running pace

MATH & EDUCATION
- Scientific calculator, percentages, fractions, equations, statistics, geometry and CGPA

DEVELOPER & FUN
- JSON formatter, regex tester, hash/UUID generators, colour converter, numerology and more

WHY CALCOS
- 100+ tools in one small app
- Clean, modern, easy-to-use interface
- Works offline for most tools
- Save results to history and favourite your most-used tools
- Indian number formatting and metric/imperial units

CalcOS is free and supported by ads.
Made by Indus Corporations.

Indus Corporations

Additional Information