infoAbout Calkulator
150+ free, accurate online calculators built for India
What is Calkulator?
Calkulator is a free online calculator platform built specifically for Indian users. We cover every calculation need — from EMI and SIP returns to income tax under both old and new regimes, GST, CGPA, BMI, and beyond. All 150+ calculators are available instantly without any login, registration, or payment.
We started Calkulator because we noticed that most financial and academic calculators available online were either designed for US users, cluttered with ads and popups, or required signup. Indian users searching for PPF maturity, NPS pension estimates, or CGPA-to-percentage conversions deserved a clean, fast, India-first experience — and that is exactly what we built.
Our Mission
Our mission is simple: make everyday calculations accessible, accurate, and free for every Indian. Whether you are a salaried employee comparing old vs new tax regime, a student checking attendance percentage, a homebuyer estimating EMI affordability, or a parent planning education savings — Calkulator helps you make informed decisions in seconds.
We believe financial literacy and numeracy start with access to the right tools. Every calculator on Calkulator includes educational context — formulas, worked examples, common mistakes, and actionable interpretation — so you understand the result, not just see it.
How We Build & Verify Calculators
Every calculator on Calkulator goes through a structured process before it goes live:
- looks_one Research — We study the official formula from authoritative sources (RBI circulars, Income Tax Act, SEBI guidelines, WHO references, AICTE norms, NCERT textbooks)
- looks_two Implementation — The formula is coded in JavaScript and runs entirely in your browser — nothing is sent to any server
- looks_3 Cross-check — Results are compared against official government portals, bank calculators, and known reference values
- looks_4 Edge-case testing — We test with minimum values, maximum values, zero inputs, and boundary conditions to ensure the calculator handles all real scenarios
- looks_5 Content review — Each page includes educational context: what the calculator does, when to use it, common mistakes, real-life examples, and FAQs written by our team
When government rules change — such as updated income tax slabs, revised GST rates, or new scheme interest rates — we update the relevant calculators and note the revision date on the page.
Why Calkulator?
- check_circle India-specific — INR, Indian tax slabs, Indian schemes (PPF, NPS, SCSS, SSY)
- check_circle No login required — use any calculator instantly
- check_circle Browser-based — calculations happen on your device, not our servers
- check_circle Mobile-friendly — works on any smartphone or tablet
- check_circle Educational — every calculator explains the formula and shows worked examples
Calculator Categories
savings Investment & Savings
SIP, Lumpsum, SWP, FD, RD, PPF, NPS, SCSS, SSY, APY, Post Office schemes, Retirement Planner, Inflation, XIRR, ROI
account_balance Loans & EMI
Home Loan, Car Loan, Personal Loan, Education Loan, Loan Eligibility, Loan Comparison, EMI vs Prepayment
receipt_long Tax & Salary
Income Tax (Old/New Regime), GST, TDS, 80C, HRA, PF, Gratuity, In-Hand Salary, LTCG/STCG
candlestick_chart Stock Market & Trading
Margin, Portfolio Returns, Break-even, Brokerage, Stock Average Price
favorite Health & Fitness
BMI, Calorie/BMR, TDEE, Water Intake, Body Fat, Ideal Weight, Pregnancy, Ovulation, Sleep, Health Insurance
calculate Education & Maths
CGPA, SGPA, GPA, Attendance, Marks %, Scientific, Statistics, Trigonometry, Algebra, Matrix, Unit Converter
construction Home & Construction
Concrete, Tile, Roofing, Square Footage, Stair, Gravel, Mulch, BTU / HVAC
code Developer & Science
JSON Formatter, Base64, Hash Generator, UUID, URL Encoder, IP Subnet, Ohm's Law, Force, Velocity, Molecular Weight
Our Editorial Standards
Every page on Calkulator is written and reviewed by our team. We do not publish auto-generated or AI-only content. Our editorial process ensures:
- Accuracy — Formulas are sourced from official guidelines and cross-checked against government portals and bank calculators
- Clarity — Each calculator includes a plain-language explanation of how the formula works, so users understand the result
- Practical value — Real-life examples, common mistakes, and interpretation guidance are provided on every page
- Freshness — Pages are updated when tax slabs, interest rates, or official rules change
Contact Us
Have a suggestion for a new calculator, found an error in a result, or want to report an issue? We'd love to hear from you:
email info@calkulator.in
location_on Office No 472/A, Near Hygiea Hospital, Munirka, New Delhi — 110067