250+ iOS apps curated and reviewed
The best energy calculator apps on iPhone average 4.4★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (74) | No | No | Jul 2026 |
| 2 |  | Free | 3.0★ (2) | No | No | May 2026 |
| 3 |  | Free | 4.4★ (65) | Yes | No | May 2026 |
| 4 |  | Free | 4.9★ (7) | No | Yes | May 2026 |
| 5 |  | Free | 4.6★ (4.8K) | Yes | No | Jul 2026 |
| 6 |  | Free | 4.6★ (570) | Yes | Yes | Jul 2026 |
| 7 |  | Free | 4.6★ (4.6K) | Yes | Yes | Jul 2026 |
| 8 |  | $2.99 | — | No | No | May 2026 |
Calculate the annual cost and energy consumption of your electrical devices. Determine how long it will take for energy-saving appliances to become profitable. This tool helps you understand your energy usage and make informed decisions.
This app helps veterinarians and students calculate the estimated energy density of dog or cat food based on its proximate analysis. It provides various energy estimations and nutrient contributions, aiding in dietary calculations for pets.
Easily calculate the energy consumption and operating costs of electrical devices. Track daily, monthly, and yearly usage, analyze costs, and estimate carbon emissions to optimize power usage and save money.
Calculate the kinetic energy of an object using its mass and velocity. A pro version offers additional calculations for mass and velocity based on kinetic energy.
This app offers a comprehensive suite of over 40 calculators and unit converters for various needs, including finance, health, construction, and everyday math. It features standard, scientific, and specialized calculators for tasks like loan amortization, currency conversion, and material estimation.
This comprehensive tool offers over 60 calculators and 16 converters for electrical engineering, wiring, and circuit analysis. It supports engineers, electricians, students, and hobbyists with calculations ranging from basic Ohm's Law to complex RLC circuits and power conversions.
This app offers a comprehensive suite of 10 powerful calculators and 10 financial worksheets, designed to handle everything from basic arithmetic to complex scientific and financial calculations. It includes features like unit conversion, currency exchange, graphing, and statistical analysis, making it a versatile tool for students and professionals.
This comprehensive calculator app offers a wide range of tools for everyday calculations, from basic arithmetic and scientific functions to unit and currency conversions. It includes specialized calculators for loans, health, fuel costs, GPA, and more, all within a clean and user-friendly interface.
This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.
Calculate household electricity usage and costs for various appliances. Track consumption by hour, day, month, or year to identify high-usage devices and save on electricity bills.
This app offers both basic and scientific calculation modes with over 30 scientific operations. It allows for customization of the app's appearance and includes features for note-taking, drawing, and viewing calculation history. It supports high accuracy calculations and nested parentheses.
This tool assists businesses in assessing energy usage and cost reduction through equipment improvements or new system investments. It calculates potential annual savings and CO2 emission reductions, benchmarks sites against best practices, and generates a personalized PDF report.