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The calculators people reach for every day.
Scientific Calculator
Mortgage Calculator
Compound Interest
SWP Calculator
BMI Calculator
Age Calculator
Days Between Dates
APR Calculator
Basic Calculator
Percentage Calculator
Fraction Calculator
NEET Score Calculator 2026
NEET Rank Predictor 2026
JEE Main Percentile Calculator 2026
JEE Advanced Rank Predictor 2026
JoSAA College Predictor 2026
NEET College Predictor 2026
3D Graphing Calculator
Electricity Bill Calculator — All States
MSEDCL Bill Calculator
TNEB Bill Calculator
BESCOM Bill Calculator
Delhi Bill Calculator
AC Bill Calculator
AC Savings Calculator
Solar Panel ROI Calculator
PM Surya Ghar Subsidy Calculator
AC Generator & Inverter Sizing Calculator
🇮🇳 Indian Finance Tools
Tax planning, investment calculators, and retirement estimators tailored for Indian taxpayers.
🎓 Exams & Study Tools
JEE Main, JEE Advanced, NEET rank predictors, college predictors, and study planners built on verified 2026 data.
Everyday Math
From simple arithmetic to advanced algebra — fast, precise tools for everyday calculations.
Scientific Calculator
This Scientific Calculator helps you solve advanced math, science, and engineering problems. It goes beyond basic add...
Open Calculator →Statistics Calculator
Mean, median, standard deviation, and variance in one shot.
Open Calculator →Slope Calculator
The Slope Calculator helps you find the steepness, direction, and equation of a line using two coordinate points on a...
Open Calculator →Pythagorean Theorem
The Pythagorean Theorem Calculator helps you find the missing side of a right-angled triangle. Whether you know the l...
Open Calculator →Percentage Calculator
The Percentage Calculator solves a wide variety of percentage-related math questions. It handles calculations like fi...
Open Calculator →Fraction Calculator
The Fraction Calculator helps you add, subtract, multiply, and divide fractions and mixed numbers. It instantly displ...
Open Calculator →3D Graphing Calculator
Plot mathematical functions, implicit equations, and parametric surfaces in an interactive 3D WebGL space. Animate custom variables over time and analyze mathematical properties in real-time.
Open Calculator →Smart Finance
Make confident money decisions — mortgages, investments, debt payoff, and more.
Mortgage Calculator
Monthly payments, interest, and full amortization schedule.
Open Calculator →Loan Calculator
Monthly payments and total cost for any loan amount.
Open Calculator →Compound Interest
Project investment growth with compounding over time.
Open Calculator →Budget Calculator
Plan monthly income, expenses, and savings goals.
Open Calculator →Health & Body
Track fitness goals, understand nutrition, and make smarter health decisions.
BMI Calculator
Find your body mass index and see your healthy weight range.
Open Calculator →BMR Calculator
Calculate basal metabolic rate and daily calorie needs.
Open Calculator →Body Fat Calculator
Estimate body fat percentage using the Navy method.
Open Calculator →Calorie Calculator
Find daily calorie needs based on activity level and goals.
Open Calculator →Time & Calendar
Age, dates, schedules, timezones — every time calculation you'll ever need.
Age Calculator
Find exact age in years, months, days, and even hours.
Open Calculator →Days Between Dates
Count exact days or business days between any two dates.
Open Calculator →Hours Calculator
Add up work hours, breaks, and timesheet entries.
Open Calculator →Time Zone Converter
Compare times and coordinate meetings across time zones.
Open Calculator →Science & Tech
Physics, chemistry, electronics — precise tools for STEM problems.
Ohm's Law Calculator
Solve for voltage, current, resistance, and power.
Open Calculator →Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Open Calculator →Unit Converter
Convert length, weight, area, volume, and more.
Open Calculator →Half-Life Calculator
Estimate decay constant and remaining radioactive mass.
Open Calculator →Construction & DIY
Measure, estimate, and plan any home improvement or building project.
Electricity
Calculate slab-wise household electricity bills, state tariff comparisons, and DISCOM estimates.
Electricity Bill Calculator — All States
This calculator estimates your residential electricity bill across all major Indian states and electricity boards. By...
Open Calculator →State Tariff Rates Comparison
This page compares residential electricity tariff rates across different states and DISCOMs in India, helping you ana...
Open Calculator →Air Conditioner
Estimate AC electricity bills, room tonnage sizing, and inverter savings options.
AC Bill Calculator
This calculator estimates the monthly and yearly electricity bill contribution of running an air conditioner. It fact...
Open Calculator →AC Tonnage Calculator
This calculator estimates the right AC size (tonnage) needed for a room based on its area, ceiling height, insulation...
Open Calculator →Appliance Cost Calculator
This calculator estimates the monthly electricity cost of running 30+ different household appliances, helping you loc...
Open Calculator →Solar Energy
Check solar payback ROI, panel sizing, net metering exports, and PM Surya Ghar subsidy rules.
Solar Panel ROI Calculator
This calculator estimates the payback period (ROI) and 25-year cumulative savings of installing a rooftop solar plant...
Open Calculator →Solar Panel Size Calculator
This calculator determines the rooftop solar plant size (kW) and number of solar panels required to offset your elect...
Open Calculator →PM Surya Ghar Subsidy Calculator
This calculator estimates the official government subsidy for rooftop solar under the PM Surya Ghar: Muft Bijli Yojan...
Open Calculator →PM-KUSUM Solar Pump Subsidy Calculator
This calculator estimates the costs, subsidies, and water output for agricultural solar pumps under the government's ...
Open Calculator →Browse the Full Directory
355+ calculators organized by topic — all free, all instant, all private.
View Full Sitemap DirectoryHow It Actually Works
Three steps, zero servers. Your numbers never leave your device.
Open any calculator
Click a calculator. The entire calculation engine downloads once to your browser — just like an app install, except it takes under a second.
Type your numbers
Enter your values — income, loan amount, age, whatever the calculator needs. Every keystroke is processed locally by JavaScript. Nothing is sent anywhere.
Get instant results
Results appear in real time as you type. No button to press, no server round-trip. Works offline too — once loaded, it runs without internet.
Why You Can Actually Trust These Numbers
We know "trust us" is cheap to say. So here's what we actually do — in plain English, no marketing fluff.
Formulas from official sources
Every Indian Finance calculator — from Income Tax to EPF to HRA — uses the exact formulas published by the Income Tax Department, EPFO, RBI, and SEBI. We cross-check against official circulars, not third-party blogs.
See our data sources →Your numbers never leave your phone
Seriously — we can't see what you type. There's no backend, no database, no analytics on your inputs. Everything runs as plain JavaScript inside your browser tab. Even if our servers went down, your calculator would still work.
Read our privacy policy →Updated every time the rules change
Tax slabs, TDS thresholds, PPF rates, NPS rules — the Indian government changes these regularly. We track every Budget announcement, RBI circular, and SEBI update. All calculators currently reflect FY 2026-27 rules.
✓ FY 2026-27 currentWe show you the formula, not just the answer
On every calculator page, we explain exactly how the result is computed — the formula, the assumptions, and any edge cases. You're never expected to just "trust the black box." Verify our logic yourself.
How we verify our data →Currently ad-free — and we don't sell your data
Right now, Desi Calculator runs without any advertisements. There is no premium tier and no data selling. We don't have a hidden revenue model. All 355 calculators are free to use today with no tracking of your inputs.
About Desi Calculator →Great for planning — not a substitute for a CA
Our calculators are excellent for understanding your finances and making informed decisions. But tax law has exceptions, and personal situations vary. For legal filings or large financial decisions, a Chartered Accountant is irreplaceable.
Full disclaimer →Frequently Asked Questions
Straight answers. No runaround.
Yes — every single one. No hidden charges, no premium tier, no account required. 355 calculators, all free to use today.
Completely. All calculations run inside your browser using JavaScript. Your income, loan amounts, and personal figures are never sent to any server — not ours, not anyone's. We literally cannot see what you type.
Yes. Every calculator is fully mobile-responsive and tested down to 375px screen width. They work smoothly on all modern Android and iOS browsers.
Yes. All Indian Finance calculators — Income Tax, HRA, Section 80C, TDS, NPS, EPF, and more — reflect the FY 2026-27 tax slabs and rules announced in Budget 2026, including the updated standard deduction and Section 87A rebate limits.
Yes. Once a calculator page loads in your browser, it works completely offline. Calculations run locally without needing an active internet connection.
Very accurate for planning purposes. We use standard mathematical formulas and official government rules. For legal filings or large financial decisions, always consult a qualified CA — our calculators are a starting point, not a substitute for professional advice.
We cover Home Loan, Car Loan, Personal Loan, Education Loan, Two-Wheeler Loan, Gold Loan, Credit Card EMI, and a Reverse EMI calculator that tells you how much loan you can afford based on your EMI budget.
Yes — PPF, NPS, EPF, Sukanya Samriddhi Yojana (SSY), Senior Citizen Savings Scheme (SCSS), NSC, Kisan Vikas Patra (KVP), Post Office MIS, and Atal Pension Yojana calculators are all available.
Open our Indian Income Tax Calculator. It automatically computes your tax liability under both regimes simultaneously and highlights which one saves you more money based on your income and declared deductions.
Yes. Every calculator has a Save Result button that stores your calculation locally on your device. There's also a Download PDF option on most calculators.