Smart Calculators for
Energy, Power & Sustainability
Instantly compute battery bank capacity, carbon footprints, power factor correction, CCTV storage — and now any calculation you can describe in plain English, powered by AI. Built by a practicing electrical engineer with 34+ years of experience.
Precision Tools for Real Engineering Decisions
All formulas are based on established engineering standards. Results are instant, accurate, and ready to use in reports or procurement documents.
🧠 AI Universal Calculator
The only calculator you will ever need. Describe any calculation in plain English and get an instant step-by-step result. No forms, no formulas, no limits.
Try It Free — No Login Needed →Battery Capacity & Sizing Calculator
Compute VAH capacity, number of batteries, and AH requirements for solar, UPS, and off-grid power systems. Essential for every power backup project.
Open Calculator →Carbon Footprint Calculator
Estimate CO₂ equivalent emissions from energy consumption, transportation, and daily activities. Essential for sustainability reporting and ESG assessments.
Open Calculator →Power Factor Improvement Calculator
Find the exact KVAR capacitor rating needed to improve your power factor to the target value. Reduces energy waste and avoids utility penalties.
Open Calculator →CCTV Storage Calculator
Calculate the exact hard disk storage required for your CCTV system based on number of cameras, resolution, frame rate, and retention period.
Open Calculator →Built for Working Engineers & Energy Professionals
Trusted by thousands of professionals across India and worldwide.
🚧 More Calculators Coming Soon
We are continuously adding new tools for engineers, energy professionals, and businesses. Check back regularly or bookmark this page.
Built by a Practicing Electrical Engineer — 34+ Years of Experience
Every calculator on EfficiencyEval is designed by an experienced electrical engineer using established industry standards and real-world engineering judgment. Free forever — no ads, no signup, no hidden costs.
Smart Calculators for Energy, Power & Sustainability Engineers
Instantly compute battery bank capacity, carbon footprints, and power factor correction — built by engineers, for engineers. No signup, no cost, no guesswork.
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WHAT WE OFFER
Precision tools for real engineering decisions
EfficiencyEval provides free, browser-based calculators for energy systems, electrical engineering, and sustainability assessments. All formulas are based on established engineering standards. Results are instant, accurate, and ready to use in reports or procurement documents.
FEATURED CALCULATORS
Battery Capacity & Sizing
Compute VAH capacity, number of batteries, and AH requirements for solar, UPS, and off-grid power systems.
Carbon Footprint Calculator
Estimate CO₂ equivalent emissions from your energy consumption, transportation, and daily activities. Essential for sustainability reporting and ESG assessments.
Power Factor Correction Calculator
Find the exact KVAR capacitor rating needed to improve your power factor to the target value. Reduces energy waste and avoids utility penalties.
WHO USES THIS
Built for working engineers and energy professionals
- Electrical and Mechanical Engineers
- Solar & renewable energy system designers
- Energy auditors and consultants
- Facility managers and building owners
- Students, researchers, and academics
- Procurement officers and project teams
More calculators coming soon
We are continuously adding new tools — load flow analysis, HVAC efficiency, lighting design calculators, and more. Check back regularly or bookmark this page.