About calculox
India's premium free calculator platform – built for accuracy, speed & simplicity.
Our Mission
At calculox, our mission is to empower every Indian with access to accurate, free, and easy-to-use financial, health, and utility calculators. We believe financial literacy and smart decision-making should not be restricted by expensive tools or complex processes.
Investment & Wealth Planning
Plan your financial future with SIP Calculator (systematic investment returns), CAGR Calculator (growth rate analysis), FD Calculator (fixed deposit maturity), RD Calculator (recurring deposit tracking), and Simple Interest Calculator (loan & deposit interest).
Loans & Real Estate Decisions
Make informed housing decisions with EMI Calculator (loan repayment schedules), Home Loan vs Rent Calculator (buy vs rent break-even analysis), and understand your monthly payment obligations with detailed amortization schedules.
Tax & Business Planning
Optimize your finances with Income Tax Calculator (FY 2024-25 slabs, new vs old regime, 9+ deductions), GST Calculator (add/remove tax at all rates), Profit Margin Calculator (cost-driven & price-driven pricing with GST impact), and Percentage Calculator (6 modes for business calculations).
Health & Wellness
Monitor your health with BMI Calculator (Body Mass Index with WHO health categories and personalized tips for your weight category).
Advanced Tools
Scientific Calculator (Casio ClassWiz-style with 4 engines: Standard, Complex Numbers, Matrix Operations, and Statistical Analysis) for students, engineers, and professionals.
What We Offer (14 Calculators)
SIP Calculator
Calculate your Systematic Investment Plan returns and projected wealth.
EMI Calculator
Calculate your loan EMI, total interest, and amortization schedule.
BMI Calculator
Calculate your Body Mass Index and check your health status.
Income Tax Calculator
Calculate your income tax liability and tax deductions.
FD Calculator
Calculate Fixed Deposit maturity with RBI-compliant modes (Cumulative, Quarterly, Monthly payouts).
RD Calculator
Calculate Recurring Deposit maturity and interest.
Simple Interest Calculator
Calculate SI with Years, Months, or Days. Automatic leap year detection.
GST Calculator
Add or remove GST at 5%, 12%, 18%, or 28% rates.
Percentage Calculator
6 calculation modes: Hike/Discount, X% of Y, What %, % Change, Reverse %, Sequential
CAGR Calculator
Calculate Compound Annual Growth Rate for your investments.
Retirement Calculator
Calculate the corpus needed to retire comfortably using the 25x rule. Plan your retirement with inflation-adjusted expenses.
Home Loan vs Rent Calculator
Compare buying vs renting with EMI, cost analysis, and break-even point calculation.
Profit Margin & Markup Calculator
Calculate profit margins, markups, and GST impact. 4 modes: Markup→Margin, Margin→Markup, Cost&Revenue, GST Analysis.
Scientific Calculator
Casio ClassWiz-style calculator with complex numbers, matrices, and statistics.
Why Choose calculox?
Lightning Fast
Instant calculations with no delays or loading screens.
100% Accurate
Verified formulas used by financial professionals.
Mobile Friendly
Works perfectly on all devices – phone, tablet, desktop.
Completely Free
All calculators are free forever. No registration needed.
Made for India
Tailored for Indian tax laws, RBI rates & financial norms.
Dark Mode
Easy on the eyes with full dark mode support.
How We Verify Our Formulas
Every calculator on calculox is built from official government and regulatory sources — not third-party references or user-submitted data. Before publishing, each formula is cross-checked against the primary source document listed below.
Used in: EMI Calculator, FD Calculator, RD Calculator, Simple Interest Calculator
Loan amortization formula P×R×(1+R)^N/((1+R)^N−1), compound interest conventions, and lending rate guidelines.
Used in: Income Tax Calculator
Tax slabs, rebate u/s 87A, deductions u/s 80C/80D/80CCD(1B), and new vs old regime comparison.
Used in: SIP Calculator, CAGR Calculator, Retirement Calculator
SIP compounding methodology, CAGR benchmark standards, and NISM retirement planning framework.
Used in: GST Calculator
CGST/SGST/IGST rate schedule (0%, 5%, 12%, 18%, 28%) per GST Council notifications.
Calculations are for informational purposes only and do not constitute financial, tax, or medical advice. Consult a qualified professional for decisions based on your specific situation.
Built by a developer, for Indian users
Software Developer · Founder
I built calculox.in after finding that most free calculators didn't handle India's tax rules, RBI guidelines, or SEBI norms correctly. All 14 calculators are built from scratch with formulas sourced from official government publications. I'm not a CA or CFP — this is a technology platform providing tools, not financial advice.
Get in Touch
Have feedback, suggestions, or found a bug? I'd love to hear from you.
supportcalculox@gmail.com