Free Online Calculators - Finance, Tax, Health & Units

Explore free online calculators for GST, SIP, EMI, compound interest, income tax, date differences, age, BMI, and general unit conversions. Fast, private, and ad-free.

BMI Calculator

Clinical-grade Body Mass Index (BMI) calculator, WHO & Asian-Pacific classification, body fat estimator, and target weight calorie deficit planner.

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Barcode Generator

Generate custom high-resolution Code 128, Code 39, GS1 EAN-13, UPC-A, ITF-14, and QR barcodes. Export as PNG, SVG, JPEG, or print A4 sticker label sheets.

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Frequently Asked Questions

How does the Indian GST Calculator work?
The GST Calculator allows you to add or remove GST from any transaction amount across 5%, 12%, 18%, and 28% tax slabs. It automatically breaks down CGST and SGST for intra-state sales or IGST for inter-state transactions.
How is compound interest and SIP returns calculated?
SIP returns are calculated using the Future Value of an Annuity formula: FV = P × [((1 + i)^n - 1) / i] × (1 + i), where P is monthly investment, i is monthly return rate, and n is total months.