FreeCalc.online was built on a single principle: accurate, educational calculators should be available to everyone free, without registration and without data collection. Every tool on this site exists to help you understand the mathematics behind real-life decisions, not just to produce a number.
Whether you are calculating a home loan EMI before speaking to a bank, verifying whether your SIP is on track to meet a financial goal, or simply checking a GST amount on a bill, this site is built for you.
Every formula on FreeCalc.online is verified against an authoritative reference before publication. We do not copy formulas from other calculator websites.
| Calculator | Reference source |
|---|---|
| EMI calculator | Reserve Bank of India (RBI) reducing balance standard |
| SIP calculator | Future Value of Annuity Due — AMFI guidelines |
| BMI calculator | WHO Technical Report Series 894, Geneva 2000 |
| Income Tax | Government of India Finance Act 2024–25 tax slabs |
| GST calculator | Government of India GST Act, 2017 |
| Percentage | Universal arithmetic — verified against NCERT mathematics |
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If you find a formula error or incorrect result, please report it via the Contact page. Formula accuracy is our highest priority. All reported errors are reviewed within 48 hours.