About Calculator Sathi

Calculator Sathi is a free website of online calculators made for everyday Indian needs. Our goal is simple: give you the right answer to a money, study or date question in seconds, and explain how that answer was calculated.

What we do

We build calculators for loans (EMI), investments (SIP, PPF, FD, RD, NPS), taxes (GST), studies (percentage, CGPA, attendance), dates (age, date difference) and fun tools people love to share. Every page shows the formula, a worked example and answers to common questions.

How we keep results accurate

• We use standard formulas followed by banks, universities and government bodies.
• Rates and rules that change (such as scheme interest rates or tax slabs) are reviewed and updated regularly.
• Every tool is tested with known examples before it goes live.

Your privacy

Calculations run inside your browser. We do not ask you to sign up and we do not store the numbers you enter. Read our privacy policy for details.

Talk to us

Found a mistake or want a new calculator? Write to contact@calculatorsathi.com.