--- title: "Construction Calculator by KLM Labs: features and prices" description: "Construction Calculator by KLM Labs does feet, inches and fractions exactly on iPhone and iPad, with stairs, roof and concrete tools. See what it costs." canonical: https://klmlabs.app/construction-calculator/ updated: 2026-11-07 --- # Construction Calculator by KLM Labs Feet, inches and fractions, done exactly, on iPhone and iPad. On the App Store as “Fraction Feet Inch Calculator”, app id 6816445977: https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977 ## At a glance Checked against the App Store on November 6, 2026. | Fact | Value | Source | |---|---|---| | Developer | KLM Labs (Listed on the App Store as Mayank Kumar Grover.) | [the App Store page](https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977); [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | | Runs on | iPhone and iPad | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | | Needs | iOS 17.0 or later | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | | Version | 1.1.1, released October 30, 2026 | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | | Price | Free to download, with in-app purchases. Every feature, the calculator included, needs the free trial or a purchase: Yearly US$9.99 a year with a 7-day free trial for eligible new subscribers, or Lifetime US$19.99 paid once (US prices). | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us); App Store Connect (the developer account) | | Languages | English and Spanish | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | | Size | 13.7 MB | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | | App Store category | Utilities | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | | Account | No account or sign-up | [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us) | ## Who it's for Carpenters, builders and DIYers on site, tape in hand. ## What it does - Add, subtract, multiply and divide feet, inches and fractions exactly, like 5' 7-3/8". (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - Multiply lengths for square feet, cubic feet and cubic yards. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - Every length also shows in total inches, decimal feet and metric (cm, mm or m). (Source: the app's source code (private).) - Answers to the nearest 1/16", or any step from 1/2" to 1/64". (Source: the app's source code (private).) - The history keeps every answer: tap one to reuse it, or copy and share it. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - 11 tools, from stairs, roof pitch and rafters to concrete, board feet and miters. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - The stairs tool works out risers, treads, run and stringer, and shares the layout as a PDF. (Source: the app's source code (private).) - Works offline once your trial or purchase is active. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) ## What it doesn't do - No camera or laser measuring: you type the measurements in. (Source: a search of the app's source code (private).) - No saved projects, jobs or estimates. (Source: a search of the app's source code (private).) - Only the stairs tool makes a PDF, and only on US Letter (no A4). (Source: the app's source code (private).) - No hips or valleys between roofs of different pitches. (Source: the app's source code (private).) - No Android or web version. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) ## Plans and prices Free to download, with in-app purchases. Every feature, the calculator included, needs the free trial or a purchase. | Plan | US price | Terms | Source | |---|---:|---|---| | Yearly | US$9.99 | a year, 7-day free trial for eligible new subscribers | App Store Connect (the developer account) | | Lifetime | US$19.99 | paid once, with Family Sharing | App Store Connect (the developer account) | The Yearly plan renews at its price each year until you cancel, and you can cancel any time in your Apple Account settings. Lifetime is one payment; nothing renews. Prices are in US dollars for the US App Store; the app shows your local price before you buy. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us); the app's source code (private).) ## Your data - No account or sign-up (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - Your history and settings stay on your device, with no cloud sync (Source: the app's source code (private).) - The app sends usage analytics and crash reports to PostHog, with screen recordings: what you type into tool fields is hidden, but the calculator's display and results show (Source: the app's source code (private).) - The App Store privacy label lists Purchases, Location, User Content, Identifiers, Usage Data and Diagnostics as data linked to you; none is used to track you (Source: [the App Store page](https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977).) The app's full privacy policy is at https://klm-labs.github.io/construction-calc/privacy/, and its terms at https://klm-labs.github.io/construction-calc/terms/. ## Get it on the App Store - Feet, inches and fractions, done exactly - Stairs, roof pitch, rafters and concrete - No ads and no sign-up Download Construction Calculator on the App Store: https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977 Free to download, with in-app purchases. Every feature, the calculator included, needs the free trial or a purchase: Yearly US$9.99 a year with a 7-day free trial for eligible new subscribers, or Lifetime US$19.99 paid once (US prices). iPhone and iPad, iOS 17.0 or later. All the facts: https://klmlabs.app/construction-calculator/ ## Free charts to print - [Fraction to decimal chart: inches, millimeters and feet](https://klmlabs.app/construction-calculator/fraction-decimal-inch-chart/): A fraction to decimal chart for every 64th of an inch, with millimeters and decimal feet, plus inches to decimal feet. Free printable PDF, US Letter. - [Roof pitch chart: degrees, slope and rafter length](https://klmlabs.app/construction-calculator/roof-pitch-chart/): A roof pitch chart from 1/12 to 24/12: the angle in degrees, slope percent, plumb and seat cuts, and rafter length per foot of run. Free printable PDF. - [Stair rise and run code: 7-3/4" risers, 10" treads](https://klmlabs.app/construction-calculator/stair-rise-and-run/): The 2021 IRC limits for stair risers (7-3/4" max) and treads (10" min), the 7-11 rule, and worked stair layouts for rises from 2' to 10'. Free PDF. - [How to calculate board feet](https://klmlabs.app/construction-calculator/board-feet/): A board foot is 144 cubic inches of lumber, 12" × 12" × 1". How to calculate board feet from nominal sizes, with a printable chart for 1x4 to 6x6. - [How many bags of concrete in a yard?](https://klmlabs.app/construction-calculator/concrete-bags-per-yard/): About 45 bags of 80 lb concrete make a cubic yard, 60 of 60 lb, 90 of 40 lb. A slab chart in yards and bags with 10% waste, as a free printable PDF. - [How to calculate square footage from inches and fractions](https://klmlabs.app/construction-calculator/square-feet-from-feet-and-inches/): Multiply length × width in inches and divide by 144 for square feet. Worked examples with feet, inches and fractions, done exactly, and a printable chart. - [Crown molding angles chart: miter and bevel settings](https://klmlabs.app/construction-calculator/crown-molding-angles/): Miter and bevel settings for 52/38 and 45/45 crown molding cut flat on a compound miter saw, for wall corners from 60° to 150°. Free printable chart. All 7 of them: https://klmlabs.app/construction-calculator/guides/ [Construction calculator apps for iPhone compared](https://klmlabs.app/construction-calculator/alternatives/): Construction Calculator by KLM Labs beside five popular feet-inch-fraction calculator apps: price, free use, where each runs and what you can share. ## More apps from KLM Labs - [Flip Clock by KLM Labs](https://klmlabs.app/flip-clock/): Flip Clock by KLM Labs is a flip clock app for iPhone and iPad: a big bedside or desk clock in your colors, with alarms that ring even on Silent. - [Invoice Maker by KLM Labs](https://klmlabs.app/invoice-maker/): Facts about Invoice Maker by KLM Labs, the offline invoice and estimate app for iPhone and iPad: who it's for, what it does and doesn't, and its prices. Every KLM Labs app and free page: https://klmlabs.app/ ## Sources 1. [Fraction Feet Inch Calculator on the App Store (US)](https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977) 2. [Apple's public app lookup for app id 6816445977 (version, size, devices, languages)](https://itunes.apple.com/lookup?id=6816445977&country=us) 3. [Construction Calculator privacy policy](https://klm-labs.github.io/construction-calc/privacy/) 4. [Construction Calculator terms of use](https://klm-labs.github.io/construction-calc/terms/) Last updated November 7, 2026.