Quillfolio Calculator

Quillfolio Calculator brings 17 calculator tools into one simple, offline app. Search from the home screen, pin favorites, and pick up where you left off with recent tools. CORE CALCULATORS • Standard — everyday arithmetic • Scientific — trigonometry, logarithms, and powers • Programmer — base conversion and bitwise operations • Fraction — add, subtract, multiply, and divide fractions EVERYDAY & FINANCIAL • Percentage — percent of, increase, decrease, and change • Tip & Split Bill — tip amounts and even splits • Loan — estimate monthly payments and total interest • Compound Interest — project savings and investment growth • ROI — calculate return on investment Financial tools provide estimates only. Results are not financial advice. HEALTH ESTIMATORS • BMI — estimate body mass index and category • Calorie — estimate BMR and daily calorie needs (TDEE) Health tools are for general reference only and are not medical advice. Consult a qualified professional for health decisions. CONVERTERS & DATE • Unit Converter — length, weight, temperature, area, volume, speed, and more • Currency Converter — offline conversion using bundled exchange rates (not live market data) • Date Calculator — date difference, add or subtract days, and age REFERENCE & UTILITIES • GPA Calculator — weighted GPA by course credits • Formula Reference — browse common math and science formulas offline • Custom Variables — store reusable numeric constants APP FEATURES • Works fully offline — no internet permission required • Save calculations to local history • Search, filter, and export history as JSON • Favorites and recent tools on the home screen • Light, dark, and system theme • Adjustable decimal precision • Clear history and custom variables in Settings PRIVACY • No ads • No analytics SDKs • No account required • Your history, variables, and settings stay on your device Install once and calculate anywhere — even without a connection.