Calculators
Quick calculators for everyday numbers — health, finance, school, and splitting a bill — all computed instantly in your browser.
BMI Calculator
Calculate your Body Mass Index from height and weight.
Percentage Calculator
Calculate percentages, percentage change, and percentage of a value.
Tip Calculator
Calculate tip amount and split the bill.
Age Calculator
Calculate exact age and days to your next birthday.
Loan & EMI Calculator
Calculate your monthly loan payment and total interest.
Discount Calculator
Calculate the sale price after a percentage discount.
GPA Calculator
Calculate your grade point average from grades and credits.
Sales Tax Calculator
Add or remove sales tax from a price.
Bill Splitter
Split a shared bill fairly and see who owes whom.
Guides & articles
How to Create a Freelance Invoice as a PDF, Free
What a freelance invoice should include, how to add sales tax correctly, and how to make a clean invoice PDF free in your browser. Not tax or legal advice.
Loan EMI Formula Explained, With a Worked Example
How the monthly payment formula works, why a longer term cuts the payment but raises total interest, and how to check your own numbers in a calculator.
Frequently asked questions
- Are the calculations accurate?
- Each calculator uses standard, well-documented formulas (e.g. amortization for loans, Flesch-style scoring for readability) — see each tool page for details.