Calculators 31 tools
Professional Online Calculators — Free & Instant
Cal44 is a free online hub of 220+ tools — 37 professional calculators and 184 dedicated unit converters — across finance, health, math, tax, time and measurement. Every calculation runs locally in your browser — your inputs never leave your device. No signup, no usage limits, no tracking of calculation values. Install Cal44 as a Progressive Web App and every tool keeps working offline.
Cal44 includes loan and mortgage calculators (EMI, compound interest, mortgage, ROI, savings goal, loan comparison), health calculators (BMI, BMR, calorie/TDEE, ideal weight, body fat), math tools (percentage, scientific, fraction, power & root, average, standard), date and time utilities (age, date difference, time, countdown), tax tools (VAT/GST/sales tax, US federal income tax) and converters (unit, currency, fuel cost, salary, GPA).