What is the iPhone Measure App? Is It accurate?


The Measure app uses the camera on your iPhone and some fancy technology called augmented reality, or AR for short. Augmented reality just means that it adds digital stuff to the real world you see through your camera. In this case, it helps you measure things.

Key Takeaways

  1. Augmented Reality: The iPhone Measure app uses ARKit to combine visual and motion data for measuring objects through the camera.
  2. Simple Operation: Open the app, point the camera, place markers, and view the virtual ruler for measurements.
  3. Accuracy Considerations: The app provides quick estimates with potential variances of 2% to 20%, suitable for rough measurements.

How Does the iPhone Measure App Work?

apple measure app
Not actual image: Artificial illustration

The Measure app on your iPhone uses some pretty smart stuff from Apple called ARKit. Think of ARKit as the brain behind the scenes.

Here’s what it does: it keeps an eye on how your phone moves, looks at what the camera sees, and then figures out the size of things based on all this information.

When you point your iPhone camera at something, the app starts looking for important bits like edges, corners, and different textures.

These are like clues that help the app understand what it’s looking at. As you move your phone around, it keeps track of these clues in every frame, kind of like connecting the dots.

This fancy process is called visual-inertial odometry. It sounds complicated, but it’s just a way of saying that the app uses both what it sees (visual) and how it feels the phone moving trhough sensors (inertial) to create a 3D map of the space around you. This map helps the app measure objects easily.

How to Use the iPhone Measure App

Using the Measure app is super easy. Here’s how you do it:

  1. Open the Measure App: Just tap on the app to get started.
  2. Point Your Camera: Aim your iPhone camera at the thing you want to measure. It could be a table, a picture on the wall, or even the space in your room.
  3. Place the Markers: Tap on your screen to drop a marker at the starting point. Then, drag your finger to place another marker at the endpoint.
  4. See the Virtual Ruler: The app will show a virtual ruler on your screen, giving you the estimated distance between the two points.
  5. Take a Photo: If you want to save the measurement, you can snap a photo. The picture will show the object along with its measurement, so you can refer back to it later.

Is the iPhone Measure App Accurate?

The Measure app on your iPhone is pretty good at what it does, but its accuracy can depend on a couple of things.

  1. Phone Calibration: If your phone is well-calibrated (which means it’s set up correctly), the app will be more accurate.
  2. Environment: The place where you’re using the app also matters. Good lighting and clear, defined edges help the app do a better job.

When you measure the same thing multiple times, you might get slightly different results each time. This can be a bit frustrating.

The app’s measurements can be inaccurate by anywhere from 2% to 20%. So, sometimes it can be pretty close to the real size, and other times it might be a bit more off.

But for quick estimates, like seeing if a piece of furniture will fit in a spot or checking the size of a room, the Measure app is fantastic.


The iPhone Measure app is like a nifty little helper that uses AR (augmented reality) to guess the sizes of things around you. It’s great for quick and easy measurements.

However, it’s not always spot-on and you shouldn’t use it for super precise tasks. So, whether you’re figuring out if a new piece of furniture will fit or just curious about the size of something, the iPhone Measure app is there to give you a quick estimate.

Note: Any verdict given by us on any of the companies, or specs of a device is subjective. Our preferences can be different from yours, so be sure to conduct your own research to make a decision that is good for you.

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Frequently Asked Questions (FAQs)

Can I measure irregular shapes with the iPhone Measure app?
Yes, you can measure irregular shapes using the iPhone Measure app. While the app is optimized for straight lines and defined edges, you can place multiple markers along the perimeter of an irregular shape to get an overall measurement. This method can give you a rough estimate of the dimensions or area of irregular objects.
Does the iPhone Measure app work in low-light conditions?
The iPhone Measure app works best in well-lit environments. In low-light conditions, the app may struggle to accurately identify edges and textures, leading to less precise measurements. To improve accuracy in darker settings, try using additional lighting or wait for better lighting conditions.
Can I measure objects vertically with the iPhone Measure app?
Absolutely, the iPhone Measure app can measure vertical objects such as walls, doors, and even people. Simply point your camera at the vertical surface, place markers at the desired points, and view the measurement on the screen. This feature is particularly useful for tasks like checking the height of ceilings or measuring furniture against wall space.

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