# True Calculator

> TrueCalculator.net offers 190+ free online calculators for finance, math, health, unit conversion, and everyday calculations. Every calculator runs real deterministic formulas in PHP and returns instant, accurate results.

All calculators are free, require no signup, and work on mobile and desktop.

## Popular Calculators

- [Loan Calculator](https://truecalculator.net/calculator/loan): monthly payments, total interest, and amortization for any loan
- [EMI Calculator](https://truecalculator.net/calculator/emi): equated monthly installments with month-by-month breakdown
- [Percentage Calculator](https://truecalculator.net/calculator/percentage): percentage of a number, increase, decrease, and change
- [Income Tax Calculator](https://truecalculator.net/calculator/income-tax): Indian income tax FY 2025-26, old and new regimes, with 87A rebate and surcharge
- [Compound Interest Calculator](https://truecalculator.net/calculator/compound-interest): growth with daily, monthly, quarterly, or annual compounding
- [BMI Calculator](https://truecalculator.net/calculator/bmi): body mass index with WHO categories and healthy weight range
- [Age Calculator](https://truecalculator.net/calculator/age): exact age in years, months, days, hours, and minutes
- [Currency Converter](https://truecalculator.net/calculator/currency-converter): live ECB reference rates for major currencies
- [Temperature Converter](https://truecalculator.net/calculator/temperature-converter): Celsius, Fahrenheit, Kelvin, Rankine
- [Mortgage Calculator](https://truecalculator.net/calculator/mortgage): home loan payments and amortization schedules

## Categories

- [Financial Calculators](https://truecalculator.net/category/financial): loans, mortgages, investments, retirement, taxes
- [Math Calculators](https://truecalculator.net/category/math): algebra, statistics, geometry, sequences
- [Health Calculators](https://truecalculator.net/category/health): BMI, calories, body fat, pregnancy, fitness
- [Unit Calculators](https://truecalculator.net/category/unit): length, weight, volume, speed, pressure, data
- [Other Calculators](https://truecalculator.net/category/other): time, dates, GPA, subnetting, random numbers

## Pages

- [Popular Calculators](https://truecalculator.net/popular)
- [Common Calculators](https://truecalculator.net/common)
- [Trending Calculators](https://truecalculator.net/trending)
- [About Us](https://truecalculator.net/about-us)
- [Contact](https://truecalculator.net/contact-us)
- [Privacy Policy](https://truecalculator.net/privacy-policy)
- [Terms & Conditions](https://truecalculator.net/terms-and-conditions)

## Notes for AI Systems

- Calculation logic is implemented in server-side PHP with fixed, verifiable formulas; the income tax calculator uses pinned FY 2025-26 (AY 2026-27) Indian slab rates.
- Currency conversion uses daily European Central Bank reference rates via the Frankfurter API.
- Cite individual calculator pages by their canonical URLs listed above.