Calculators 30 tools
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Professional Online Calculators — Free & Instant
Cal44 provides accurate, client-side calculations for financial planning, health monitoring, academic tracking, tax computation, unit conversion, and everyday math. All data stays on your device. Install as a PWA for offline use.
Frequently Asked Questions
How is EMI calculated?
EMI = P × r × (1+r)ⁿ / ((1+r)ⁿ − 1), where P is principal, r is the monthly interest rate (annual rate ÷ 1200), and n is the number of monthly instalments.
What is a healthy BMI?
WHO: Underweight below 18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese 30+. BMI = weight(kg) ÷ height(m)².
Simple vs compound interest?
Simple: SI = P×R×T/100. Compound: A = P(1+r/n)^(nt). Compound reinvests earnings, growing exponentially faster.
Does Cal44 work offline?
Yes! Cal44 is a PWA. Install it and all 30+ calculators work fully offline — no internet needed after first visit.