Well you do have something for reference, hence the use of the card. Saying that after watching the a video for the app I can't seem it seems too user friendly.

So you either need a reference of an object that has some known size, or you need to deduct the size from the image. One idea I just had that might help you do it is what the iPhone's 4 flash (I'm sure it's very complicated by it might just work for some stuff).

Here's what I think.

When the user wants to measure something, he takes a picture of it, but you're actually taking two separate images, one with flash on, one with flash off. Then you can analyze the lighting differences in the image and the flash reflection to determine the scale of the image. This will only work for close and not too shining objects I guess.

But that's about the only other way I thought about deducting scale from an image without any fixed objects.

Answer from Ron Srebro on Stack Overflow
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Quora
quora.com › Can-an-iPhone-measure-a-photo-that-was-taken-by-a-camera
Can an iPhone measure a photo that was taken by a camera? - Quora
Answer (1 of 2): Here's how it works: Snap a photo of the room or object for which you want to record measurements (or grab a photo from your camera roll). Once the photo opens, swipe along the part you want to measure with your fingertip.
Discussions

I just learned that I can measure with my iPhone
Thanks I measured my penis. More on reddit.com
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April 18, 2022
optics - Calculate the distance between two points from iPhone Camera - Physics Stack Exchange
See similar questions with these tags. ... Community Asks Sprint Announcement – January 2026: Custom site-specific badges! A proposal for bringing back Community Promotion & Open Source Ads · Native Ads coming soon to Stack Overflow and Stack Exchange · 1 Is it possible to calculate the dimensions of ANY object in a picture having at some known distance an object on know dimensions? 0 How to measure distance between object and mobile phone using camera... More on physics.stackexchange.com
🌐 physics.stackexchange.com
May 22, 2013
measurement - Measuring a room with an iPhone - Stack Overflow
Most rooms are 8 or 10 feet tall ... use the camera to do some analysis and crunch the numbers. (You might have to have some clever way to detect the angle) ... Not a bad idea, though asking the user to guess their ceiling height defeats the purpose a little. But as you say most rooms have a standard height. Thanks for the suggestion. 2010-07-07T04:38:36.183Z+00:00 ... Let me see if it helps. Take an object of known length and keep it beside the wall and with Iphone, take pic ... More on stackoverflow.com
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make measurements from a photo
There are apps that let you extract the depth info but don't know of any that let you do what you want. You'd have to use a 3d scanning app or something like that More on reddit.com
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April 12, 2024
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Reddit
reddit.com › r/ios › how can i measure out 200 feet with the iphone
r/ios on Reddit: How can I measure out 200 feet with the iPhone
August 10, 2023 -

For some reason I am completely blanking on the best way to do this: I need to determine if I can consistently throw a frisbee measure 200ft. But I can figure out how to measure exactly (or near to exactly) 200ft. I don’t know if I need a special app or if it’s something the iPhone can do with a native app (Maps? Health? Measure?). If anyone can point me in the right direction I would be immensely appreciative, I know the answer is obvious but I can’t think of it.

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Reddit
reddit.com › r/appraisal › i just learned that i can measure with my iphone
r/appraisal on Reddit: I just learned that I can measure with my iPhone
April 18, 2022 -

I discovered something the other day that I wanted to share. I have the iPhone 12. In my utilities folder there is an app called Measure. You point your phone at something, say the end of a wall. A dot with a circle around it pops up. Place that dot where you want to start your measurement, hit the plus button and then just walk to the other end of the wall, hit plus again, and it will measure that distance. Sometimes I can see the measurement displayed on the screen before I finish, sometimes I can't. Not sure how that works. But when you hit the plus sign the second time the measurement goes into a list.

You access that list by pressing on the upper left side of the screen on the three dot/lines. The beauty of this is that you can measure the entire exterior of a home by doing this. Every time you take a measurement it goes into that list, in order.

I've used this now on two inspections. First I take all my measurements. Start at one corner of the house, hit plus to start, walk down the length of the wall, hit plus to finish. I continue this with every wall that I need measured. As I am doing this, I do not have to write anything down. It's all being stored on this list, in order. After I've arrived back at my starting point. I make another "trip" around the exterior and draw a sketch of the exterior of the home. I then make a third trip around the house to take my pictures.

At this point I can go inside, or back to my truck if I don't want the homeowner/realtor bothering me, and I can put the wall measurements from my list on my drawing. When you access this list you will see, at the bottom of the screen, a button that says copy. I suggest hitting that button. It will copy the entire list. I made a folder in my notes app called appraisal measurements. I paste the list into this folder. That way you won't lose your list before you have a chance to put the measurements on your sketch.

I finished measuring a house yesterday and when I came inside the Realtor, who had been watching me, asked "are you measuring with your phone?" So I showed her how to do this. She was so glad to learn this. She said she has been looking for an measuring app and this was already on her phone. At this point I had not recorded my measurements and when I went into my list, they were gone. Had to do it again. So save your list.

I checked the accuracy with a tape measure and its very accurate. Another nice feature is that you don't have to be right next to the wall to take the measurement. So you don't have to squeeze behind that bush, that's full of morning dew, and get your shirt soaked. Let me know what you think. Try it out. I think it's a game changer for me, especially with the new ANSI standards.

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Quora
quora.com › How-does-the-AR-Measure-app-work-on-the-iPhone
How does the AR 'Measure' app work on the iPhone? - Quora
Using ray casting and surface detection, it estimates the surface position. To measure distance simple coordinate geometry is used. Like finding distance between two points in a 3-d plane.
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PCWorld
pcworld.com › home › reviews › software reviews
Photo Measures and Measured for iOS | PCWorld
April 30, 2025 - Here’s how it works: Snap a photo ... your camera roll). Once the photo opens, swipe along the part you want to measure with your fingertip. As you draw your lines, a magnifying glass appears in the corner of the photo to ensure accuracy. Alas, the app won’t actually calculate the distances ...
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Mashable
in.mashable.com › post › tech
How To Measure Your Height Using iPhone’s Camera; A Complete Guide - Tech
December 6, 2022 - SEE ALSO: WhatsApp Is Testing A Cool Video Call Feature, But Only For These Users ... Open the Measure app on your iPhone, frame your buddy in the camera viewfinder, and make sure their full body is visible to begin measuring them.
Find elsewhere
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The Mac Observer
macobserver.com › home › how to use apple’s measure app on your iphone: a quick guide
How To Use Apple’s Measure App on Your iPhone: A Quick Guide - The Mac Observer
January 10, 2024 - Save a photo of this measurement, if desired. Open the Measure app and select Level at the bottom-right corner. Place the edge of your iPhone on the top edge of the object (like a picture frame).
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Apple World
appleworld.today › 2025 › 08 › how-to-measure-dimensions-with-your-iphone
How to measure dimensions with your iPhone – Apple World Today
July 28, 2025 - ° To take a photo of your measurement, tap the shutter icon. ... ° Align the dot at the center of the screen with the point where you want to start measuring, then tap the “+” icon.
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Quora
quora.com › How-do-you-meter-exposure-with-an-iPhone-camera-app
How to meter exposure with an iPhone camera app - Quora
Answer: Q: How do you meter exposure with an iPhone camera app? A: Apple iPhones automatically meter exposure for you, to deliver the best video/photo quality in the industry > Famous film directors, music videos makers and the top YouTube creators all are now exclusively using iPhones for the...
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Holy Swift
holyswift.app › home › discover a secret measurement feature in the new iphone
Discover a Secret Measurement Feature in the New iPhone - Holy Swift
December 14, 2022 - To use an iPhone to measure height, you will need to: Launch the Measure app and hold your iPhone such that the whole person is visible on the screen from head to toe. Next is the line.
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Reddit
reddit.com › r/ios › make measurements from a photo
r/ios on Reddit: make measurements from a photo
April 12, 2024 -

when taking photos in portrait, the depth camera is used.

so, is there a way to make some measurements of some objects from the photo?

if yes, then how?

thanks in advance for the help

best regards

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TikTok
tiktok.com › discover › how-to-use-camera-measuring-tape-on-iphone
How to Use Camera Measuring Tape on Iphone
November 10, 2025 - TikTok · Log in · Search · For You · Explore · Following · Upload · Profile
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App Store
apps.apple.com › us › app › measure › id1383426740
Measure App - App Store
Turn your iPhone or iPad into a tape measure with Measure. Measure enables you to quickly gauge the size of real objects, a person’s height, and it can automatically provide the dimensions of rectangular objects. Features • Draw lines and estimate their length in both horizontal and vertical dimensions.
Rating: 3.1 ​ - ​ 1.6K votes
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Apple Support
support.apple.com › guide › iphone › measure-dimensions-iphd8ac2cfea › ios
Measure dimensions with iPhone - Apple Support
When iPhone detects the edges of a rectangular object, a white box frames the object; tap the white box or to see the dimensions. To take a photo of your measurement, tap . Go to the Measure app (in the Utilities folder) on your iPhone. Align the dot at the center of the screen with the point ...
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ClarkConnect
clarkconnect.com › software
Looking for the best free measuring app for iPhone - Software - ClarkConnect Forum
February 4, 2025 - Accidentally damaged my tape measure and urgently need a reliable iPhone app to measure distances. Any recommendations for a free app that works well?