Circuit Calculator3.01 - App Store

Circuit Calculator - The Essential Tool for Circuit Solutions:

Solve circuit problems effortlessly! Circuit Calculator is the go-to app for students, engineers, and electronics enthusiasts. Quickly build, simulate, and solve linear AC and DC circuits - ideal for study, verification, or practical use.
Build, Solve & Review Results:

. Create schematics by dragging, rotating, and snapping components
. Tap solve to compute steady-state voltages and currents
. Follow DC current flow with real-time animations
. Zoom and pan around to review results directly on the schematic
. Tap detailed analysis to also compute power values
Perfect for Learning & Quick Verification:

Whether you're checking your homework or confirming a design, Circuit Calculator supports both rectangular and polar notation - just like textbook problems. It focuses on steady-state behaviour in linear circuits, making it ideal for academic and professional use.
Other Key Features:

. Interactive user guide
. Pre-built example circuits
. Supports DC and sinusoidal AC circuits
. Computes Thévenin and Norton equivalents
. Save to iCloud for access across devices
. Export/share circuits or PDF snapshots
. Import circuits from others
. Undo/redo and copy/paste support
Available Components:

. Independent Ideal Current Sources
. Independent Ideal Voltage Sources
. Current-Controlled Current Sources
. Current-Controlled Voltage Sources
. Voltage-Controlled Current Sources
. Voltage-Controlled Voltage Sources
. Resistors, Capacitors & Inductors
. Mutually Coupled Inductors (AC only)
. Impedances (AC only)
. Diodes (DC only)
Learn More & See It in Action!

Want to see Circuit Calculator in action? Visit our website or check out our YouTube channel for tutorials!

Version History Improved bold accessibility font support for customer alerts and improved high resolution zooming. 3.01 06/15/2025 • Complete user interface overhaul for a faster, smoother experience
• Add connectors instantly with a two-finger tap
• Export and share your saved circuits with ease
• Learn faster with new interactive tutorials
• Explore pre-built example circuits to get started quickly
• Navigate effortlessly using the new zoom slider 3.0 06/06/2025 Minor compatibility updates for iOS 15 2.92 10/02/2021 Fix for unclear display if device running in dark mode. 2.91 02/21/2021 Minor improvements. 2.90 11/11/2020 Minor improvements to user guide. 2.89 04/20/2019 Fixed a bug which under certain circumstances caused the app to crash in the Thévenin Equivalent Circuit calculation. 2.87 12/31/2017 Some amendments to user guide and other minor performance improvements. 2.86 12/28/2017 Some minor performance improvements to the quick start user guide. Added dynamic font support to component selector. 2.85 10/24/2017 Amendments to the quick start user guide. 2.84 10/09/2017 Added diode component for DC analysis. Added SI unit prefixes to DC component and results labels. Various other minor improvements. Please contact nwd.apps@gmail.com to report any issues or if you have any questions on using the app. 2.83 07/19/2017 Adjusted maximum level on iPhone for a double tap zoom. Please contact me at nwd.apps@gmail.com to report any issues or if you have any questions on using the app. 2.82 01/26/2017 Fixed a bug where editing a capacitor for a DC circuit showed the unit selector in Henrys not Farads. Please contact me at nwd.apps@gmail.com to report any issues or if you have any questions on using the app. 2.81 12/13/2016 Added animation for current flow in dc circuits. This feature can be enabled or disabled in the app settings. Various minor improvements in performance. Please contact me at nwd@nwd-apps.co.uk to report any issues or if you have any questions. 2.8 11/23/2016 Fixed a bug where loading previously saved files from the local device might crash the app if the user was not logged into iCloud. Please contact me at nwd@nwd-apps.co.uk to report any issues or if you have any questions. 2.7 11/02/2016 Fixed alignment of toolbar icons in vertical stack view. Please contact me at nwd@nwd-apps.co.uk to report any issues or if you have any questions. 2.6 10/29/2016 Thanks for using Circuit Calculator! This version includes the following updates:

・Added save to camera roll and airdrop share options.
・Added new file/network activity indicators.
・Minor amendments to user guide content.
・Various other minor fixes and improvements.

Please contact me at nwd@nwd-apps.co.uk to suggest potential improvements or report any issues. 2.5 10/24/2016 Fixed bug where saving a file to iCloud sometimes caused the app to crash. 2.3 10/11/2016 Added iCloud support so you can now access saved circuits across all of your devices.

Added some quick access shortcuts to the home page icon for force touch enabled devices.

Added a link via the toolbar action button to a set of tutorial videos.

Fixed an issue with resistor and connecting wires not showing properly on some devices.

Fixed keyboard scrolling on iPad in component editor, settings and file ops view controllers.

Fixed an issue where the the component data in mutual coupled inductors was not stored properly.

Various other minor improvements. 2.2 10/09/2016 Added a double tap gesture to the toolbar to toggle between a single toolbar which can be swiped left or right or all three toolbars in a vertical stack. Improvement to word wrapping on component labels. 2.1 09/06/2016 There are now two extra toolbars which replace the menu button in the previous version. Capacitors and inductors are now available components in DC analysis mode. AC power calculations have been added to the detailed analysis results. Long labels for component values, currents and voltage word wrap to the next line. A new copy and paste function has been added. A long press on the background no longer shows node labels as this now has it's own toolbar button. The circuit schematic can now be printed via the action button on the toolbar. Detailed analysis results can also be printed via a print button on the results page. Units have been added to the component value, voltage and current labels on the circuit schematic. New alert messages adjust their text size based on the user's system preferences and the content becomes scrollable if necessary. You can now zoom and scroll on the preview image in the load / save screen. There is a now radians or degrees option available via the settings page for the complex argument values used in the app. New image assets added for iPhone 6 Plus higher resolution display. Various other enhancements to performance. 2.0 08/30/2016 Fixed problem with node labels not displaying with new iOS 9 system font. 1.52 09/26/2015 Added new function to the main menu to find the Thevenin/Norton equivalent circuit voltage/current/impedance. 1.5 09/08/2015 Added a new menu item to the user guide linking to YouTube. This YouTube channel has videos on how to use the app. 1.4 06/01/2015 Some bug fixes and improvements to auto layout. Improvements to user guide. 1.3 05/15/2015