Financial Calculators
22 live calculators for loans, investing, savings, tax, retirement and business — each one showing the formula it uses, the substituted values and an exportable report.
Featured Calculators
Loans
Investing
Savings
Tax
Planning
Business
Popular Calculators
Recently Added
About the Financial Suite
Money decisions deserve maths you can see. Every OneCalcApp financial tool prints the formula it uses, the assumptions behind it and a breakdown of principal, interest and tax, so the number is auditable rather than magical.
Loan tools use reducing-balance amortisation as RBI-regulated lenders do. Investment tools use annuity-due future values, matching how AMCs allot SIP units. Tax tools follow the Income Tax Act with FY 2025-26 slabs, the ₹75,000 standard deduction under the new regime and the post-July-2024 capital gains rates.
Calculations run entirely on your device — salary, loan and investment figures never leave the browser, and every result can be copied, printed or exported as a PDF report.
Frequently Asked Questions
Start with the most used tool
Work out an instalment in seconds, then explore the rest of the OneCalcApp platform.