# PlasterCalculator > PlasterCalculator (iPhone/iPad app by Steve McCulloch.) - Source: https://appshunter.io/ios/app/plastercalculator/id1559735679 (this page in markdown: same URL + `.md`) - Developer: [Steve McCulloch](https://appshunter.io/developer/1559735681) - Category: Productivity, Utilities - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 17.6 · 8 MB - Languages: American English - Released: 2021-04-11 - Data updated: 2026-08-31 - User reviews in markdown: https://appshunter.io/ios/app/plastercalculator/id1559735679/reviews.md ## What is PlasterCalculator? Need a plaster mold to create your ceramic masterpiece? Do you need a simple plaster form suitable for a one-off project? Are you creating plaster slabs for drying wet clay or for a dampbox container? Plaster Calculator can help! It's easy to eye-ball the plaster/water ratio for a one-off or non-critical piece using the island method, such as for the bottom of a wetbox. However, when making multi-part molds or a series of identical molds, the proper ratio is critical to ensure consistency across molds and in the resulting ceramic piece. Plaster Calculator can help you determine the amount of plaster and water for your mix, ensuring consistent results using many of the common plaster types available, including #1 Pottery Plaster, Hydrostone, Ultracal, and several others. Key Features: Calculate the volume of your plaster need based on the dimensions of the most common forms in centimeters, inches, or feet. Forms include square/rectangle (cuboid), cylinder, sphere/half-sphere, pyramid (3 and 4 sided), and cone, as-well-as allowing you to enter an already known volume amount. Additionally, can calculate the volume of a void space within the plaster mold, such as when making a mold from an existing object, the void volume amount will be removed from the main volume. Save your mix calculation for later referral. Allows measurement of plaster and water in pounds/ounces or grams, the default can be changed in the Settings. Calculates a typical volume reduction of 30% (as recommended by some sources). This value can be changed between 0 (for no adjustment) and 45%, the default value can be changed in the Settings. Provides plaster weight variations -/+5 points from the standard consistency for the plaster. For example, the standard consistency of #1 Pottery Plaster is 70, variations are provided from 65 to 75 supplying the plaster amount needed for that consistency. Allows changing of the plaster type prior to saving mix, default plaster type can be changed in the Settings. Allows optional donation to developer - please do :) Please add a review :) Version 3.0 Changes =============== Revamped interface to use buttons for volume calculation type instead of swiping. Removed interface color options, now only system light and dark modes available. Removed animations on several UI elements. Ensure compatibility with iOS/iPad 26. The minimum iOS/iPad version is now 17.6. Various bug fixes, performance and interface improvements. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Donation | $0.99 | one-time | ## Version history (last 5 releases) ### 3.1.0 — 2026-08-20 Add Settings option for plaster and water amounts to show tenths decimal place in the amount when applicable, default is now not to show. Few minor bug fixes, interface and formatting improvements. Please rate Plaster Calculator and consider donating in the About screen :) ### 3.0.1 — 2026-08-18 Revamped interface to use buttons for volume calculation type instead of swiping. Removed interface color options, now only system light and dark modes available. Removed animations on several UI elements. Ensure compatibility with iOS/iPad 26. The minimum iOS/iPad version is now 17.6. Various bug fixes, performance and interface improvements. ### 2.0.0 — 2023-01-15 Updated to improve compatibility with iOS 16 and latest iPad sizes. Removed full interface color options, only color accents available now. Added support for multiple plaster types. Various bug fixes and interface improvements. ### 1.2.1 — 2021-05-07 Metric unit now using grams instead of kilograms. Enlarge text size of displayed ratio. Changed default percent reduction from 20 to 30%. Increased top percent adjustment value from 35 to 45.% Corrected calculation of plaster amount to use (had been less than 1% too low). Additional minor bug fixes and enhancements. ### 1.2.0 — 2021-04-18 Improved iPad layout. Polished rougher edges of appearance. Added ability to donate to developer using in-app purchase. Added additional information when viewing result of a saved mix. ## Apps similar to PlasterCalculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Unit Conversion +](https://appshunter.io/ios/app/unit-conversion-plus/id6742060456) | — | Free | Productivity | | [apprAIz](https://appshunter.io/ios/app/appraiz/id6741251326) | 4.4 (7) | Free | Productivity | | [Potfolio: Ceramic Research](https://appshunter.io/ios/app/potfolio-ceramic-research/id1528857080) | 5.0 (4) | Free | Productivity | | [Brick and Plaster Calculator](https://appshunter.io/ios/app/brick-and-plaster-calculator/id1359584645) | — | $2.99 | Productivity | | [Constropedia Brick Calculator](https://appshunter.io/ios/app/constropedia-brick-calculator/id6443644509) | 5.0 (2) | Free | Productivity | | [Blazed: Kiln Logs](https://appshunter.io/ios/app/blazed-kiln-logs/id1595514944) | 4.2 (5) | Free | Productivity | ## More apps by Steve McCulloch - [Ceramake](https://appshunter.io/ios/app/ceramake/id6776782051) All apps by Steve McCulloch: https://appshunter.io/developer/1559735681 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*