Motor Efficiency Calculator

Motor Efficiency Calculator helps engineers, maintenance teams, electricians, and motor buyers assess electric motor performance and operating costs. Analyze IEC and NEMA motor efficiency in one app, identify estimated efficiency classes, and compare potential annual energy costs and savings. IEC AND NEMA IN ONE APP • Switch between IEC and NEMA calculation modes. • Use IEC 60034-30-1 and NEMA MG 1 efficiency references for motor-class comparisons. • Enter power in kW or hp, plus motor voltage, current, efficiency, and power factor as applicable. • Configure frequency (50/60 Hz), pole count, and relevant NEMA motor phase and enclosure settings. PRACTICAL ENGINEERING RESULTS • View calculated input power, output power, motor efficiency, and power factor. • See the estimated efficiency class and an accompanying confidence indicator. • Compare IE1, IE2, IE3, and IE4 reference efficiencies. • Estimate annual energy consumption (kWh) and electricity cost using your own cost per kWh and operating hours per year. • Compare yearly operating costs and potential savings across efficiency classes. • Share results directly from the calculation screen. UPDATED EFFICIENCY ANALYSIS The calculator includes updated 2026 reference data for IEC and NEMA efficiency analysis. The revised calculations were tested using data from more than 200 motors. It is designed to support engineering assessment and informed motor selection, maintenance, and replacement decisions. OFFLINE CALCULATIONS After subscription activation, the core motor-calculation tools can be used without an internet connection. An internet connection may be needed for subscription purchase, restoration, verification, or management. No ads. No affiliate links. No separate app account or login is required. IMPORTANT ENGINEERING DISCLAIMER Motor Efficiency Calculator provides engineering estimates, not certified motor test results or a determination of regulatory compliance. Results depend on the values entered and the applicable motor configuration. Verify results with measured data, applicable standards, and qualified engineering judgment before making equipment or financial decisions. SUBSCRIPTION INFORMATION Motor Efficiency Calculator is a subscription-only app. There is no free tier and no free trial. A subscription provides full access to the app and its calculation tools. Monthly and Annual auto-renewable subscriptions provide the same full access; only the billing period differs. Subscriptions are purchased through Apple In-App Purchase. Localized subscription prices and renewal terms are shown before purchase. Payment is charged to your Apple Account at purchase confirmation. Subscriptions renew automatically unless canceled through your Apple account before renewal. You can manage your subscription in the app under Settings > Manage Subscription, which opens Apple's subscription-management interface. SUBSCRIPTION VERIFICATION App Store subscriptions may be securely verified with Apple through a developer-operated verification service to confirm active subscription access and help restore access after reinstalling the app. This verification is used to determine subscription entitlement. Motor inputs and calculation results are processed on your device for the core calculator functions. Terms of Use: https://sunnyengineer.com/terms.html Privacy Policy: https://sunnyengineer.com/sunengineering_privacy_policy.html