CalCulator

CalCulator · Free Online Calculators

CalCulator

Free, fast, and private online calculators for percentage, BMI, EMI, mortgage, SIP, age, tip, discount, unit conversion, and more. No signup required.

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Popular calculators

Free tools with worked examples — see all 31 calculators.

%
Math & Percentages

Percentage Calculator

Calculate percentages instantly — find X% of a number, reverse percentages, percent change, increases, and dec…
BMI
Health & Fitness

BMI Calculator

Calculate your Body Mass Index (BMI) in seconds using kilograms & centimeters or pounds & inches. See your WHO…
EMI
Finance & Loans

EMI Calculator

Plan any loan with a bank-style EMI calculator. Enter amount, interest rate, and tenure to see monthly EMI, to…
Home
Finance & Loans

Mortgage Calculator

Estimate your monthly mortgage payment from home price, down payment, interest rate, and loan term — plus tota…
CI
Finance & Loans

Compound Interest Calculator

Project how savings and investments grow with compound interest. Add optional monthly contributions to model r…
Tip
Everyday Tools

Tip Calculator

Calculate tip and split the bill fairly. Enter bill total, tip percent, and number of people for instant per-p…
Off
Everyday Tools

Discount Calculator

See the real sale price and how much you save. Enter original price and discount percent for instant results.…
⇄
Converters

Unit Converter

Convert length, weight, temperature, volume, area, speed, and digital storage units instantly. Accurate consta…
$
Finance & Loans

Salary Calculator

Convert any pay period into yearly, monthly, weekly, daily, and hourly amounts so you can compare job offers f…
Age
Everyday Tools

Age Calculator

Find your exact age in years, months, and days from any date of birth. Instantly see total days lived and coun…
Cal
Health & Fitness

Calorie Calculator (BMR & TDEE)

Estimate your daily calorie needs with the Mifflin-St Jeor BMR formula and activity-based TDEE for maintenance…
SIP
Finance & Loans

SIP Calculator

Project your SIP maturity value from monthly investment, expected return rate, and tenure. See invested amount…

Guides & explainers

Long-form articles that go beyond the button — how EMI really works, when BMI misleads, and more.

8 min read

How EMI Is Calculated — and What Banks Leave Out

Understand equated monthly installments, the reducing-balance formula, and the fees that change your real borrowing cost.

 7 min read

Understanding BMI — Limits and Better Alternatives

When body mass index helps, when it misleads athletes and older adults, and what to measure instead.

 7 min read

Mortgage Payment Planning Beyond the Formula

Principal and interest are only part of homeownership cost. Build a realistic monthly budget before you buy.

 8 min read

Compound Interest for Savers — Realistic Expectations

How compounding grows savings, why return assumptions matter, and how SIP math differs from a fixed bank rate.

View all guides →

Why CalCulator?

CalCulator is built for people who need a correct answer in seconds — students checking percentages, shoppers verifying discounts, homebuyers estimating mortgage payments, and anyone converting units on the go.

Built for real everyday use

  • Private by design — your numbers stay on your device; we do not store calculator inputs on our servers.
  • Transparent math — every tool shows the formula, step-by-step examples, and common pitfalls.
  • Works everywhere — fast on mobile and desktop, no account or download required.
  • Maintained regularly — we review formulas against published standards (WHO BMI ranges, standard loan EMI, and similar references) and update pages when guidance changes.

Trust and limitations

Finance and health results are estimates for planning and learning — not medical, tax, or legal advice. For important decisions, confirm numbers with a qualified professional. See our About page for how we write and test calculators.