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19 free calculators · AI smart assistant · Pro subscriptions

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Quick answers for EMI, loans, GST, salary, work hours, dates and BMI. Every calculator shows its formula and a worked example, and an optional AI assistant can talk you through the steps.

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The tools visitors reach for most — for loans, tax, pay, health, and everyday maths.

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EMI Calculator

Calculate your monthly EMI, total repayment, and interest for any fixed-rate loan, with tenure in months as most Indian lenders quote it.

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Mortgage Calculator

Work out your monthly mortgage payment from home price, down payment, rate, and term — plus the total interest over the loan.

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Investment Calculator

See how compound growth builds your portfolio from a lump sum, monthly contributions, or both.

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Credit Card Payoff Calculator

Enter your balance, APR, and monthly payment to see how long payoff takes and how much interest you will pay.

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Percentage Calculator

Find a percentage of a number, what percent one value is of another, or the percentage change between two values.

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GST Calculator

Add GST to a base price or remove it from an inclusive total, with 5%, 12%, 18%, 28%, or a custom rate.

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Work Hours Calculator

Add your start time, end time, and break minutes to get total hours worked — including overnight shifts.

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BMI Calculator

Calculate your BMI in metric or imperial units and see which WHO weight category it falls into.

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Describe what you need, like a loan, a tax rate, or a custom formula. CalcTap AI picks the right calculator, CalcTap’s engine computes the result, and the AI explains each step. A free account includes a daily allowance, and Pro and Premium plans add larger allowances and more features.

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What is the monthly EMI on a ₹5,00,000 loan at 9% for 3 years?

EMI calculator ₹5,00,000 · 9% · 36 months

Monthly EMI

₹15,900

Your EMI is ₹15,900 a month. Over 3 years you repay ₹5,72,395 in total, of which ₹72,395 is interest.

How it works

From question to answer in three steps

  1. Find your calculator

    Search by name or task, or browse one of six categories.

  2. Enter your numbers

    Fill in a few clearly labelled fields — sensible defaults are already set.

  3. Get your result

    Copy the answer, then check the formula and worked example below it.

From the blog

Guides that explain the maths

Plain-English walkthroughs you can pair with any calculator.

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Finance

How to Compare Loan Offers Properly (The EMI is Only Half the Story)

Two loans with the same monthly payment can have wildly different total costs. Here's how to see through the EMI headline and compare loans on what actually matters.

Divyesh P ·

Health

What Your BMI Really Means — and What It Doesn't Tell You

BMI is one of the most widely used health metrics in the world — and one of the most misunderstood. Here's what it actually measures, where it falls short, and which extra checks give a clearer picture.

Divyesh P ·

Finance

How to Calculate GST: A Plain-English Guide for Buyers and Business Owners

Adding GST to a price and removing it from an inclusive total are two different calculations — and many people get the reverse one wrong. Here's the correct method for both.

Divyesh P ·

FAQ

Questions, answered

Can’t find what you’re looking for? Visit the full FAQ or contact us.

Yes. Every calculator on CalcTap is free to use and needs no account. If you also want AI explanations, formula generation, image-to-calculation or saved history, there are optional Free, Pro and Premium plans for CalcTap AI.
CalcTap AI is an optional assistant that takes a calculation described in plain language, runs it through the right CalcTap calculator and explains the steps. It can also build formulas and, on Premium, read numbers from an image. Free accounts get a daily allowance, and Pro and Premium plans offer larger allowances and more features.
The numbers come from CalcTap’s own calculation engine, not from the AI model. The AI reads your question or image, chooses the calculator and inputs, and explains the result. It can still misread a question, so check the inputs it shows you.
The calculators run in your browser, so what you type is not sent to our servers. If you use CalcTap AI, your question or image is sent to our AI provider to produce the answer. Details are in the Privacy Policy.
Yes. Every tool and AI feature is designed mobile-first, with large inputs and instant results that work on phones, tablets, and desktops.

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