About AnchorChainCalculator
Rather than following generic and unspecific advice how much chain or rope to pay out when at anchor, use this app to calculate the right amount of chain or rope needed for the anchor to have the best possible grip -...
Rather than following generic and unspecific advice how much chain or rope to pay out when at anchor, use this app to calculate the right amount of chain or rope needed for the anchor to have the best possible grip - safety tailored for your vessel! This app has been developed by a sailor living at anchor. It is based on physics rather than rules. Only too often does anchoring advice boil down to: Use a scope (i.e. ratio of chain length to water depth) of 3:1 in calm weather, and increase this to 5:1 or 7:1 as the wind picks up. This advice is independent of your vessel’s characteristics, independent of water depth, swell, or even the wind strength. So, is a scope of 7:1 still good enough for the storm tonight? Is the snubber or bridle you are using good enough to keep you safe at anchor? The Anchor Chain Calculator allows you to calculate the minimally required anchor chain and/or rope length based on a number of vessel characteristics and sea / weather conditions. It tells you what load the anchor will have to bear, and when you are using a snubber, bridle or rope, how much of the swell it absorbs, and how much it reduces the anchor load. When anchoring in shallow water it is particularly important to include these dynamic and elastic effects caused by strong swell and gusts. The app can work with a chain-only scenario as well as with an arbitrary mix of rope and chain. So, despite its name, it can also deal with a rope without any chain at all. ;) You can also restrict the chain or rope length, if you have to - perhaps because of nearby neighbours or obstacles - and get information how this restriction affects the anchor load and the angle at which the chain pulls at the anchor. The app has two modes of working: Basic Mode and Expert Mode. With Basic Mode you will be able to use the app right away, whilst Expert Mode allows you to enter more technical details of your boat if you know them. You can use either metric units (metres, daN / kp, and mm for chain thickness) or imperial units (feet, lbs, and inch for chain thickness). You can store different vessel configurations by name and so can easily switch, e.g., between different snubber, bridle, rope or vessel setups (e.g., a snubber for the lunch stop, another snubber for normal usage, and a third longer and even more elastic snubber for really bad weather). These setups can be locked to prevent accidental overwriting. This app is also great for playing through all kinds of "what if?” scenarios. It will help you to plan ahead and be better prepared. The perfect addition to an anchor alarm / anchor watch for safer anchoring!
Version History Corrected bug in mixed mode chain and rope when swell energy is zero 2.2.8 04/04/2024 Improved offline help 2.2.7 12/17/2023 Quickly see what happens to your anchor setup when you increase the wind strength in steps of 5 kn 2.2.6 08/29/2023 Seabed slope can now be provided as angle or as gradient. Made chain and rope view interfaces more consistent with each other. 2.2.4 08/21/2023 More robust calculation. Added low wind warning. 2.2.3 08/16/2023 Updated offline help 2.2.2 03/28/2023 updated offline help 2.2.1 02/13/2023 Updates and improvements for offline help 2.2.0 01/23/2023 improved offline help 2.1.5 11/12/2022 Added offline help for Spanish 2.1.0 10/30/2022 Fixed bug that led to rare crash at start-up 2..0.6 10/12/2022 minor bug fix for lbf/lbs view 2.0.5 09/07/2022 bug fix 2.0.4 08/25/2022 bug fix 2.0.2 08/16/2022 Improvements and small bug fixes 2.0.1 07/25/2022 Major update which can now calculate an arbitrary mix of rope and chain! More accurate model for snubber. 2.0.0 07/17/2022 Updated French and Danish online help 1.7.1 11/29/2021 Different vessel configurations can now be stored by name. Snubber can be non-linear. 1.7.0 11/12/2021 Small bug fixes and support for breaking load of snubber added 1.5.0 09/07/2021 Added localisation of offline help for Danish and Norwegian 1.4.0 07/21/2021 Provided localisation for English, German and French behind Info Buttons to allow for offline help. iPad Landscape mode is now supported. 1.3.0 06/09/2021 Made it more convenient to edit custom field for Snubber Quality 1.2.0 03/08/2021 Minor bug fixes 1.1.1 02/26/2021 Added 'custom' option for Snubber Quality to store values customised in Expert mode 1.1.0 02/25/2021 Made more efficient use of screen size for larger devices. 1.0.3 01/28/2021
Previous Versions
Here you can find the changelog of AnchorChainCalculator since it was posted on our website on 2024-03-26 14:33:46.
The latest version is 2.2.8 and it was updated on 2026-06-27 21:51:33. See below the changes in each version.
AnchorChainCalculator version 2.2.8
Updated At: 2026-06-09
Changes: Version History Corrected bug in mixed mode chain and rope when swell energy is zero 2.2.8 04/04/2024 Improved offline help 2.2.7 12/17/2023 Quickly see what happens to your anchor setup when you increase the wind strength in steps of 5 kn 2.2.6 08/29/2023 Seabed slope can now be provided as angle or as gradient. Made chain and rope view interfaces more consistent with each other. 2.2.4 08/21/2023 More robust calculation. Added low wind warning. 2.2.3 08/16/2023 Updated offline help 2.2.2 03/28/2023 updated offline help 2.2.1 02/13/2023 Updates and improvements for offline help 2.2.0 01/23/2023 improved offline help 2.1.5 11/12/2022 Added offline help for Spanish 2.1.0 10/30/2022 Fixed bug that led to rare crash at start-up 2..0.6 10/12/2022 minor bug fix for lbf/lbs view 2.0.5 09/07/2022 bug fix 2.0.4 08/25/2022 bug fix 2.0.2 08/16/2022 Improvements and small bug fixes 2.0.1 07/25/2022 Major update which can now calculate an arbitrary mix of rope and chain! More accurate model for snubber. 2.0.0 07/17/2022 Updated French and Danish online help 1.7.1 11/29/2021 Different vessel configurations can now be stored by name. Snubber can be non-linear. 1.7.0 11/12/2021 Small bug fixes and support for breaking load of snubber added 1.5.0 09/07/2021 Added localisation of offline help for Danish and Norwegian 1.4.0 07/21/2021 Provided localisation for English, German and French behind Info Buttons to allow for offline help. iPad Landscape mode is now supported. 1.3.0 06/09/2021 Made it more convenient to edit custom field for Snubber Quality 1.2.0 03/08/2021 Minor bug fixes 1.1.1 02/26/2021 Added 'custom' option for Snubber Quality to store values customised in Expert mode 1.1.0 02/25/2021 Made more efficient use of screen size for larger devices. 1.0.3 01/28/2021
AnchorChainCalculator version 2.2.8
Updated At: 2024-04-04
Changes: Apr 4, 2024
Version 2.2.8
Corrected bug in mixed mode chain and rope when swell energy is zero
AnchorChainCalculator version 2.2.8
Updated At: 2024-04-04
Changes: Corrected bug in mixed mode chain and rope when swell energy is zero
AnchorChainCalculator version 2.2.7
Updated At: 2023-12-17
Changes: Dec 17, 2023
Version 2.2.7
Improved offline help
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