Calculators that show their working.
Every result comes with the formula behind it — because for a CA student the computation is the syllabus, not a shortcut around it. Check mock scores against passing criteria, split GST, amortise a loan, compound an investment.
CA Exam Marks & Passing Calculator
Enter your expected marks paper-by-paper and instantly see whether you clear ICAI's passing criteria — 40% per paper and 50% aggregate — plus which papers earn the 60-mark exemption.
GST calculatorGST Calculator (Inclusive & Exclusive)
Compute GST both ways: add GST to a base amount (exclusive) or extract GST from an MRP-style total (inclusive), across the 5%, 12%, 18% and 28% slabs, with the CGST/SGST split shown.
EMI calculatorEMI Calculator (Loan Instalment)
Work out the equated monthly instalment for any loan from principal, annual interest rate and tenure — with total interest payable, exactly as the annuity formula in CA Foundation's Time Value of Money chapter computes it.
CI calculatorCompound Interest Calculator
Compute compound interest and maturity value with yearly, half-yearly, quarterly or monthly compounding — the workhorse formula behind Time Value of Money questions in CA Foundation and investment maths across the course.
A number you cannot reproduce is a number you cannot use in an exam.
An ordinary calculator
- Returns a figure with no visible method
- Teaches nothing you can carry into the exam hall
- Leaves you unable to check whether the answer is sane
- Hides the assumption that produced the result
These calculators
- States the formula it applied, every time
- Shows the substitution so you can rehearse it by hand
- Names the assumption behind the figure
- Written against ICAI criteria, not a generic template
The calculator gives you the number. Kartavvya gives you the method.
Work a full problem step by step at your level, with every line of the computation explained the way it has to be written in the exam.
Work a problem free- Free to start
- Step-by-step working
- All 3 CA levels