Calculator
Free Calculator Tools
Fast everyday calculators with instant results. Choose a tool, enter your details and generate your result instantly. Most processing happens locally in your browser.
Privacy: inputs are processed in your browser unless a feature explicitly needs your camera. Always verify important outputs before publishing or using them professionally.
Calculator Tools – Online Tools, Features and How to Use Them
Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss. This page brings together 8 free utilities in one place. Choose a tool from the tool list, provide the required information and run it to get an instant result. The interface is designed for desktop, tablet and mobile browsers.
How to use these Calculator Tools
- Open the tool you need from the list.
- Read the field labels and enter accurate information.
- Click Run Tool to process your input.
- Review the output carefully, then use Copy Result or select the text manually.
- Use Clear before starting a new calculation or task.
Tools and step-by-step instructions
Age Calculator: How to use Age Calculator
Choose the date of birth and the as-of date, then click Run Tool. The result shows the difference in years, months and days.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
EMI Calculator: How to use EMI Calculator
Enter the principal loan amount, annual interest rate and tenure in months. Click Run Tool to calculate estimated monthly EMI, total repayment and total interest using the reducing-balance formula.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
GST Calculator: How to use GST Calculator
Enter the amount and GST rate, then select whether the amount already includes GST. Click Run Tool to see taxable value, GST amount and final amount.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
Percentage Calculator: How to use Percentage Calculator
Enter the value and the total, then click Run Tool. The calculator returns the value as a percentage of the total.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
BMI Calculator: How to use BMI Calculator
Enter weight in kilograms and height in centimetres. Click Run Tool to calculate BMI and show a general adult category reference; this is not a diagnosis.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
Profit & Loss Calculator: How to use Profit & Loss Calculator
Enter cost price and selling price, then click Run Tool. The result shows profit or loss amount and its percentage relative to cost price.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
Loan Calculator: How to use Loan Calculator
Enter principal, annual interest rate and tenure in years. Click Run Tool to calculate simple interest and total repayment. This is not an EMI/reducing-balance calculation.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
Discount Calculator: How to use Discount Calculator
Enter the original price and discount percentage (0–100), then click Run Tool to calculate the discount amount and final price.
Helpful tip: Free online calculators help estimate age, loan payments, GST, percentages, BMI, discounts and profit or loss.
Frequently asked questions
Are these tools free?
Yes. The tools on this page are provided free to use. Some features, such as QR and barcode generation, load a small library from a CDN and need an internet connection.
Do I need to install an application?
No installation is required. Open this page in a modern web browser. QR camera scanning additionally needs HTTPS, camera permission and browser support.
Are my inputs uploaded to a server?
Most text, calculation and color operations run directly in your browser. Camera scanning uses your device camera after you grant permission. Avoid entering confidential or sensitive information into any online tool unless you have reviewed the site and its privacy practices.
Can I rely on every result without checking?
Use results as practical assistance and verify important technical, financial, legal, publishing or business decisions independently. Some tools perform simplified checks or estimates, as explained in their instructions.