Archelle
A converter for architects and architecture students. Lengths, areas and volumes, from plan to reality or between two scales.
iPhone and iPad · French, English, Korean · Free
App Store release in preparation
How to use Archelle
- Choose length, area or volume.
- Select the conversion direction and your plan’s scale.
- Enter a measurement and select the input and output units.
- Read the result, reverse the conversion, or copy and share the value.
Useful guidance
Why do area and volume factors differ?
At 1:100, length is multiplied by 100, area by 100² and volume by 100³. For example, 1 cm² on the plan represents 1 m² in reality.
How do I use a custom scale?
Tap the scale, scroll to Custom scale, enter the number after 1: and choose Apply. For a 2× enlargement, use 1:0.5.
What does ≈ mean?
The calculation or display is approximate. Results show up to 12 significant digits; reversing uses the full calculation value.
Can I measure a plan using the screen?
The dimension line is a visual reference. Use a suitable ruler and check the document’s intended print size: resizing changes its scale.
Contact support
To report a problem, include your device model, iOS version, measurement type, units and scales. Do not send a confidential document.
Privacy
Last updated: October 9, 2026.
Publisher
Archelle is published by Libra International - FZCO.
Calculations and measurements
Conversions are calculated on your device. Archelle does not send measurements to a server or save them between sessions. You can clear the measurement using the clear button.
No collection or tracking
Archelle has no user accounts, advertising, in-app purchases or analytics tools. It does not collect personal data or request access to your contacts, photos or location.
Copying and sharing
When you choose Copy or Share, the result is sent to the clipboard or the app you select. The system may sync the clipboard with your other devices. Recipient apps apply their own privacy policies.
Retention and deletion
Archelle does not retain a measurement history or personal data on a server. No deletion request to the publisher is needed for calculations. Results you have copied or shared must be deleted in the recipient apps.
This policy concerns the Archelle app. If you contact support, your message is used to reply to you. Visiting this website may create technical logs at the hosting provider; no analytics tools or forms are added to these pages.