Last reviewed: June 2026 · Owner: Vajid Khan
All formulas, regulatory values, and health guidelines on Calculent.com are verified against primary sources. We do not use secondary aggregators or unverified financial websites as primary references.
Finance & Tax Sources
- Income Tax: Income Tax Department India (incometax.gov.in) — tax slabs, deductions, Section references
- GST: GST Network (gst.gov.in) — GST slabs, HSN codes, notifications
- EPF/PPF: EPFO (epfindia.gov.in) — contribution rates, interest rates, withdrawal rules
- RBI Policies: Reserve Bank of India (rbi.org.in) — repo rate, MCLR, banking regulations
- Mutual Funds: SEBI (sebi.gov.in) — MF regulations, LTCG rules, expense ratios
- Home Loans: NHB (nhb.org.in) — housing finance guidelines and LTV ratios
- PMAY: PMAY-MIS Portal — housing subsidy rates and eligibility
Health & Medical Sources
- BMI Classification: WHO (who.int) — International BMI classification standards (2004, updated 2020)
- BMR Formula: Mifflin-St Jeor Equation (1990) — Mifflin MD, et al. Am J Clin Nutr. 1990;51(2):241-7
- Harris-Benedict (Legacy): Harris JA, Benedict FG (1918) — cited for BMR comparison calculations
- Calorie/TDEE: USDA Dietary Guidelines 2020-2025 and WHO Energy Requirements (2004)
- Water Intake: WHO Guidelines for Drinking-Water Quality and National Academies of Sciences hydration recommendations
Mathematics & Engineering Sources
- EMI/Loan Formulas: Standard time-value-of-money formulas per Financial Management (Prasanna Chandra, McGraw-Hill)
- Compound Interest: Standard financial mathematics as defined in IFRS accounting standards
- SIP Formula: Association of Mutual Funds in India (AMFI) standard future value formula
- CAGR/XIRR: Excel financial function specifications (Microsoft, ISO 29500)
- Solar Panel Output: IEC 61215 standard and MNRE specifications
- Electricity Billing: State-specific electricity tariff orders from respective SERCs
Source Verification Standard
Every default value and formula in our calculators must be traceable to at least one primary source from the above categories. When official values change, we update within 24-72 hours of the official announcement.
If you believe a specific formula or value does not match its official source, please contact us with your reference.