Smart Tools for Everyday Life
Smart Tools. Simple Answers. Today that means calculators, converters and everyday utilities — EMIs, salary, GST, percentages, dates and more — each with the formula and reasoning laid out beside the answer.
No sign-upNothing storedWorks offline once loaded
Popular calculators
The tools people reach for most often.
EMI Calculator
Monthly instalment, total interest and a full repayment schedule for any loan.Calculate in FinanceSIP Calculator
Future value of a monthly SIP, with optional yearly step-up.Calculate in FinanceGST Calculator
Add or remove GST and split it into CGST, SGST or IGST.Calculate in FinanceSalary Calculator
CTC to monthly in-hand salary after PF, professional tax and income tax.Calculate in SalaryPercentage Calculator
Percentage of a number, what percent one number is of another, and percentage change.Calculate in MathAge Calculator
Exact age in years, months and days, plus your next birthday.Calculate in Date & TimeFD Calculator
Maturity value and interest earned on a cumulative fixed deposit.Calculate in FinancePPF Calculator
Maturity value of Public Provident Fund deposits over 15 years or more.Calculate in Finance
Browse by category
- Finance calculatorsLoans, EMIs, investments, deposits and tax on purchases.
- Salary calculatorsTurn a CTC offer into monthly take-home pay.
- Education calculatorsCGPA, percentages and attendance for students.
- Math calculatorsPercentages and everyday arithmetic.
- Unit convertersLength, weight and temperature conversions.
- Date and time calculatorsAge, date differences and working days.
- Health calculatorsBody mass index and healthy weight ranges.
- Everyday toolsPasswords, word counts and text utilities.
Featured tools
Converters and utilities that do not need a single rupee sign.
Length Converter
Kilometres, miles, feet, inches, metres and more.Convert in ConvertersPassword Generator
Strong random passwords generated privately in your browser.Open tool in ToolsWord Counter
Words, characters, sentences, paragraphs and reading time.Open tool in ToolsDate Difference Calculator
Days, weeks and working days between two dates.Calculate in Date & Time
Why CALQEVA
Your numbers stay on your device
Every calculation runs in your browser. Nothing you type into a calculator is uploaded, stored or linked to you, and there is no account to create.
The working is shown
Each calculator states the formula it uses, explains what the inputs mean and walks through an example, so you can check the answer rather than trust it.
Built to be fast
Pages are static, fonts are self-hosted and there is no tracking clutter, so calculators load quickly even on a slow connection.
Kept current
Tax slabs, GST rates and scheme limits are stored as versioned data and updated when the rules change, with the applicable year shown on the page.
Recently added
From the blog
All articles →- Finance
How to calculate EMI for a home loan
Understand the EMI formula, how interest and principal split inside each instalment, and what actually changes the total cost of a home loan.2 min read - Finance
Prepaying a loan: what actually saves the most
When you prepay a loan, you usually choose between a lower EMI and a shorter tenure. Here is how the two differ and when each one makes sense.1 min read - Finance
SIP or lump sum: how to think about it
The SIP versus lump sum question usually has an obvious answer once you know where the money is coming from. Here is the framework.1 min read - Finance
Compound interest, explained without the hype
How compound interest works, why frequency matters, and what the rule of 72 actually tells you, with worked examples.1 min read
Common questions
Are these calculators free to use?
Yes. Every calculator and tool on CALQEVA is free, with no sign-up, no usage limit and no paid tier. The site is supported by advertising.
Do you store the values I enter?
No. Calculations happen entirely in your browser using JavaScript. The numbers you type are never sent to our servers, saved or shared. If you copy a result link, the values travel in the link you choose to share, and nowhere else.
How accurate are the results?
Each calculator uses the standard published formula for its subject, and the formulas are covered by automated tests. Results can still differ slightly from a bank, employer or government figure because of rounding, fees or rules specific to your situation, so treat them as well-informed estimates.
Can I use CALQEVA outside India?
Yes. Financial calculators let you pick from several currencies, and general tools such as percentage, BMI and the unit converters work anywhere. Some calculators are India-specific by design, including PPF, GST and the salary calculator.
How often are new calculators added?
Regularly. New calculators are listed in the Recently added section on this page, and each one ships with its explanation, formula and examples rather than being published bare.
Find the calculator you need
Twenty-one calculators, converters and tools, each with its formula, a worked example and answers to the questions people actually ask.