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Free KnowAndInvest tools — Real Estate, Marketing and Aspect Ratio calculators Free KnowAndInvest tools — Real Estate, Marketing and Aspect Ratio calculators
KnowAndInvest Renting vs Buying and Performance Marketing tools KnowAndInvest Renting vs Buying and Performance Marketing tools
KnowAndInvest Aspect Ratio Calculator and Land Area Converter KnowAndInvest Aspect Ratio Calculator and Land Area Converter
KnowAndInvest Carpet Area Calculator and Land Area Converter KnowAndInvest Carpet Area Calculator and Land Area Converter
Free & Instant

All KnowAndInvest Tools, in one place

KnowAndInvest offers 10 free tools and calculators — Salary Calculator, Income Tax Calculator, Home Loan EMI Calculator, Education Loan EMI Calculator, Renting vs Buying Calculator, Carpet Area Calculator, Land Area Converter, Performance Marketing Planner, Aspect Ratio Calculator and Free Online Image Resizer — with no signup required and results shown instantly in your browser.

Every KnowAndInvest tool is built for the numbers people check most — take-home salary and income tax, loan EMIs, property area and buying decisions, land unit conversions, marketing budgets, and image and video dimensions. Pick a tool below and get your answer in seconds.

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Design & Media
Aspect Ratio Calculator
Convert a ratio to pixel dimensions or find the ratio of any width × height, with a copy-ready CSS aspect-ratio value.
Open Calculator →
📐
Real Estate
Carpet Area Calculator
Check how much usable carpet area you're actually getting against the built-up and super built-up area quoted.
Open Calculator →
🗺️
Real Estate
Land Area Converter
Convert between acres, hectares, sq. ft., sq. m., cents, guntha, bigha and other regional land units instantly.
Open Converter →
🎯
Marketing
Performance Marketing Planner
Plan performance marketing budgets — target leads, CAC and spend allocation across channels from your conversion and CPL assumptions.
Open Planner →
🔑
Real Estate
Renting vs Buying Calculator
See whether renting or buying works out cheaper over time, factoring in EMI, rent escalation, down payment and opportunity cost.
Open Calculator →
💰
Finance & Tax
Salary Calculator
Convert your annual CTC into monthly in-hand salary after PF, professional tax, standard deduction and income tax under the Old and New regimes.
Open Calculator →
🧮
Finance & Tax
Income Tax Calculator
Compare the Old and New tax regimes side by side with deduction sliders, the Section 87A rebate and a full slab-wise breakdown.
Open Calculator →
🏠
Finance & Tax
Home Loan EMI Calculator
Estimate your monthly home loan EMI, total interest and total repayment from the loan amount, interest rate and tenure.
Open Calculator →
🎓
Finance & Tax
Education Loan EMI Calculator
Estimate the monthly EMI, total interest and total repayment on an education loan from the loan amount, interest rate and tenure.
Open Calculator →
📷
Design & Media
Free Online Image Resizer
Resize JPG, PNG and WebP images to exact pixel sizes in your browser — free, with no sign-up and no uploads.
Open Tool →
ℹ️ About This Tool

What Is the KnowAndInvest Tools Directory?

This page is a free, all-in-one directory of every KnowAndInvest tool — covering salary and income tax calculation, home and education loan EMIs, renting vs buying comparisons, carpet area efficiency, land area conversion, performance marketing planning, aspect ratio and pixel dimension conversion, and online image resizing.

Every calculator listed here is free to use, requires no signup, and is built for salaried employees, borrowers, homebuyers, property owners, marketers, designers and content creators who want quick, reliable numbers without wading through spreadsheets. Simply pick a category or filter by tag, and jump straight into the tool you need.

Each tool shares the same design system and calculation logic used across the KnowAndInvest platform, so results stay consistent whichever one you use. The salary and income tax tools follow current Indian tax-regime terminology, the Home Loan and Education Loan EMI calculators use standard EMI and amortisation formulas, the real estate tools follow RERA-aligned carpet area definitions, the Land Area Converter covers regional units such as cents, guntha and bigha, the marketing planner works from your own conversion and cost-per-lead assumptions, the Aspect Ratio Calculator keeps whatever ratio you give it, and the Free Online Image Resizer processes your image in the browser without uploading it.

Use the filter bar above to narrow the list down to Finance & Tax, Real Estate, Marketing, or Design & Media tools. Each card links directly to a dedicated page with instant results and a breakdown of how the numbers were calculated.

New tools are added regularly as the platform grows — bookmark this page to always find the latest tools in one place.

❓ Common Questions

KnowAndInvest Tools FAQs

Every tool on this page shares the same underlying design system and calculation standards used across KnowAndInvest — salary and tax tools follow current regulatory terminology, loan tools use standard EMI/amortisation formulas, real estate tools follow RERA-aligned definitions, and the marketing calculator uses platform-agnostic formulas. Always keep your own inputs and definitions consistent when comparing results across tools or over time.