calckit is a free collection of 25+ everyday calculators covering personal finance, health, and daily calculations. Mortgage, compound interest, ROI, currency converter (170+ currencies with live rates), unit converter, tip calculator, tax estimator, BMI, calorie needs, body fat, age, date, percentage, discount, and salary calculators. All calculations run in your browser — no server, no tracking, no data collected. No account required. No ads. 100% free.