2026 Decision Utilities
Smart Calculators & Consumer Decision Tools
High-precision, independent calculators engineered for Indian households, gadget buyers, and retail investors. Completely free with zero signup required.
📢 For Bloggers, Journalists & Webmasters:
Every calculator on this page includes a 1-click responsive embed code for your own website or publication.
Every calculator on this page includes a 1-click responsive embed code for your own website or publication.
100% Free Embed
Energy Saver
1. BLDC Fan Electricity Savings & Payback Calculator
Calculate your annual bill reduction and payback months compared to an old 75W induction ceiling fan.
Annual Money Saved
₹4,906
Power Units Saved / Year
613 kWh
Payback Timeline
8.6 Months
Health & Clean Air
2. Air Purifier Room Sizer & CADR Smog Sizer
Calculate the exact Clean Air Delivery Rate (CADR) required for your room volume and ambient outdoor AQI.
Minimum Recommended CADR
250 m³/h
Air Changes Per Hour (ACH)
4.0 ACH
Recommended Class
Living Room / Master Bed
Sovereign Debt
3. RBI G-Sec vs Green Bond Post-Tax Yield Calculator
Calculate semi-annual coupon credits, tax liability by bracket, and net post-tax maturity yield.
Half-Yearly Payout
₹7,050
Effective Post-Tax Yield
4.85%
Sovereign Security
100% Risk Free
Student Utility
4. Student APAAR & DigiLocker Grievance Letter Generator
Generate a formal institutional letter for student name corrections, duplicate IDs, or missing ABC credits.
