PDFAITools
Every Calculator You Need — In One Place
From mortgages and 401(k) to TDEE, quadratic equations and voltage drop — 200+ free calculators covering finance, health, math, science, construction and more. No signup, instant results.
Frequently Asked Questions
Yes. Our GST calculator supports all current rates — 3%, 5%, 12%, 18% and 28% — and shows CGST/SGST breakdown. The income tax calculator is updated for FY 2024-25 with both Old and New Regime slabs including the revised ₹75,000 standard deduction under the New Regime.
It covers the most common deductions: standard deduction, HRA, 80C (up to ₹1.5L), 80D, and home loan interest. For complex situations involving capital gains, business income, or foreign income, consult a CA.
Use the standard SIP calculator for a fixed monthly investment. Use the Step-Up SIP calculator if you plan to increase your SIP amount each year (highly recommended — small annual increments dramatically increase your corpus). Use the ELSS calculator if you want the 80C tax benefit alongside your SIP returns.
Using the standard formula: EMI = P × r × (1+r)ⁿ / ((1+r)ⁿ − 1), where P is the principal, r is the monthly interest rate, and n is the number of months. Our calculator also shows a 12-month amortisation schedule.
All 58 calculators are completely free with no account required. They run entirely in your browser — no data is sent to our servers.