# MeisterCalc: construction calculator app

> MeisterCalc (Meister Calc) is a construction calculator app for builders, carpenters, framers, concreters and DIY builders, on Android. It has 16 calculators, each with a live diagram, works metric-first with feet, inches and sixteenths in Settings, and calculates offline on site. The website also has a free online construction calculator. Made by Meru Apps.

The blog at https://meistercalc.com/blog works each site calculation by hand: the formula, a worked example with real numbers, and the same calculation in the app. Building rules quoted in the guides are summaries; the local building code and the engineer's drawings decide.

## When the app helps

- An exact number is needed on site: stair risers and going, stairwell opening, baluster gaps, roof pitch and rafter length, fall over a run, concrete to order, gravel, soil or asphalt in tonnes, studs in a wall and their marks, decking lineal metres, a square corner, reduced levels from a dumpy level.
- Results in millimetres or in feet, inches and sixteenths, where a conversion slip costs material. The app's Feet & Inches calculator adds and subtracts feet, inches and fractions; multiplying and dividing them is on the website's free construction calculator.
- No phone signal on site: every calculator works offline.

## Price and platform

- Free to download from Google Play. Concrete, Stairs and Check Square are free to use.
- The other 13 calculators unlock with a one-time purchase (a lifetime unlock, no subscription required) or with a weekly subscription (3-day free trial). Google Play shows the price in the user's currency.
- Runs on Android 7.0 or later.
- Google Play: https://play.google.com/store/apps/details?id=com.meistercalc.meistercalc

## Calculators and their main guides

Each app calculator has a page in the app section (https://meistercalc.com/features). Seven of the jobs also have a free web calculator at their own address, with the calculator at the top of the page.

- Stairs (free): [web calculator](https://meistercalc.com/stair-calculator) with an NCC 2025 check, [in the app](https://meistercalc.com/features/stair-calculator); guides: [2R + G formula](https://meistercalc.com/blog/stair-formula-2r-g), [stairwell opening](https://meistercalc.com/blog/stairwell-opening-size), [laying out a stair stringer](https://meistercalc.com/blog/mark-out-stair-stringer)
- [Baluster Spacing](https://meistercalc.com/features/baluster-spacing-calculator): baluster count, gap, on-centres and a marking table; guide: [baluster gap rules in Australia](https://meistercalc.com/blog/balustrade-gap-australia)
- Check Square (free): [web diagonal calculator](https://meistercalc.com/diagonal-calculator), [in the app](https://meistercalc.com/features/check-square-calculator); guide: [checking a frame is square](https://meistercalc.com/blog/how-to-check-if-a-frame-is-square)
- Pitch: [web roof pitch calculator](https://meistercalc.com/roof-pitch-calculator) and [web fall calculator](https://meistercalc.com/fall-calculator), [in the app](https://meistercalc.com/features/pitch-calculator); guide: [roof pitch in degrees](https://meistercalc.com/blog/how-to-calculate-roof-pitch)
- [Raked Walls](https://meistercalc.com/features/raked-wall-calculator): raked walls from a pitch or from two heights, with stud marks and lengths
- [Triangles](https://meistercalc.com/features/triangle-calculator): any right triangle from two values; guide: [Pythagoras in construction](https://meistercalc.com/blog/pythagoras-in-construction)
- Concrete (free): [web calculator](https://meistercalc.com/concrete-calculator), [in the app](https://meistercalc.com/features/concrete-calculator); guide: [concrete for a slab](https://meistercalc.com/blog/how-much-concrete-do-i-need)
- [Gravel](https://meistercalc.com/features/gravel-calculator), [Soil](https://meistercalc.com/features/soil-calculator) and [Asphalt](https://meistercalc.com/features/asphalt-calculator): cubic metres to tonnes; guides: [cubic metres to tonnes](https://meistercalc.com/blog/cubic-metres-to-tonnes), [mulch for a garden bed](https://meistercalc.com/blog/how-much-mulch-do-i-need), [topsoil before laying turf](https://meistercalc.com/blog/how-much-topsoil-for-turf), [sand for a sandpit](https://meistercalc.com/blog/how-much-sand-for-a-sandpit)
- [Stud Counter](https://meistercalc.com/features/stud-calculator): studs in a wall; guide: [stud wall framing](https://meistercalc.com/blog/wall-framing-calculations)
- [Running Measurements](https://meistercalc.com/features/running-measurements-calculator): stud marks along a plate; joist spacing in [Australia](https://meistercalc.com/blog/joist-spacing-australia), [New Zealand](https://meistercalc.com/blog/joist-spacing-nz) and [the UK](https://meistercalc.com/blog/joist-spacing-uk)
- [Equal Spacings](https://meistercalc.com/features/equal-spacing-calculator): divide a length into equal gaps; guide: [dividing a length evenly](https://meistercalc.com/blog/how-to-divide-a-length-into-equal-spaces)
- Decking: [web calculator](https://meistercalc.com/decking-calculator), [in the app](https://meistercalc.com/features/decking-calculator); guide: [how many decking boards](https://meistercalc.com/blog/how-many-decking-boards)
- [Dumpy Level](https://meistercalc.com/features/dumpy-level-calculator): height of instrument and reduced levels; guide: [using a dumpy level](https://meistercalc.com/blog/how-to-use-a-dumpy-level)
- Feet & Inches: [web calculator](https://meistercalc.com/feet-and-inches-calculator), [in the app](https://meistercalc.com/features/feet-and-inches-calculator); guide: [mm to feet and inches](https://meistercalc.com/blog/mm-to-feet-and-inches)

## Free calculators on the website

- [All free construction calculators](https://meistercalc.com/calculators): the list of every free calculator on this site, grouped by job (everyday, concrete and masonry, roof and slope, stairs, India), each with its purpose
- [Construction calculator](https://meistercalc.com/construction-calculator): the all-in-one page. Add, subtract, multiply and divide feet, inches and fractions (to 1/16" or 1/32") or mm, cm and m, with the answer in feet-inches, decimal feet, inches, mm and m; tabs for area, concrete and bags, roof pitch, stairs, right triangles and conversions
- [Concrete calculator](https://meistercalc.com/concrete-calculator): slabs, footings and post holes in m³ or cubic yards, with bag counts, an optional cost from the user's own price, and rebar for a slab (bars both ways, cover, laps, stock bars)
- [Block and brick calculator](https://meistercalc.com/blog/block-calculator): concrete blocks (CMU, cinder block) and bricks for a wall, less doors and windows, plus 5%, with mortar bags from the makers' published yields
- [Brick calculator for India](https://meistercalc.com/blog/brick-calculator-india): bricks for a 9-inch or 4½-inch wall in feet or mm (IS 1077 modular 190 × 90 × 90 mm, non-modular and traditional sizes), less doors and windows, plus 5%, with cement bags and sand in cft for 1:6, 1:5 or 1:4 mortar
- [Concrete mix calculator (India)](https://meistercalc.com/blog/concrete-mix-calculator-india): cement in 50 kg bags, sand and aggregate in m³, cft and brass for M20 (1 : 1.5 : 3), M15 and M10 nominal mix from the wet volume × 1.54, with IS 456 Table 9 water
- [Stair calculator](https://meistercalc.com/stair-calculator): risers, treads, stringer length and stairwell opening, in mm or feet and inches, with an NCC 2025 check for Australian houses
- [Fall calculator](https://meistercalc.com/fall-calculator): slope or fall as %, degrees, 1 in X and rise over run, and the fall over any length
- [Roof pitch calculator](https://meistercalc.com/roof-pitch-calculator): X in 12, degrees and rafter length
- [Decking calculator](https://meistercalc.com/decking-calculator): boards across, lineal metres and the order with 10% extra, from the deck size, board width and gap, in mm or feet and inches
- [Feet and inches calculator](https://meistercalc.com/feet-and-inches-calculator): add and subtract feet and inches, convert to mm, cm or m
- [Diagonal calculator](https://meistercalc.com/diagonal-calculator): the diagonal a square frame should measure, and from two measured diagonals, how far out it is and which corners to push
- [CFT, brass and m³ converter](https://meistercalc.com/for/india#how-do-i-convert-cft-brass-and-cubic-metres): cubic feet, brass and cubic metres (1 brass = 100 cft = 2.832 m³)

The long guides behind the calculators stay on the blog, for example [Stair maths: risers, treads, stringer, opening](https://meistercalc.com/blog/stair-calculator) and [Concrete in m³ or yards: slabs, footings, bags](https://meistercalc.com/blog/concrete-calculator-m3).

## By trade and country

- [Building codes by country](https://meistercalc.com/building-codes): stair, barrier, roof pitch, footing and deck numbers from Australia's NCC 2025, the New Zealand Building Code (D1/AS1, E2/AS1, NZS 3604), England's Approved Document K and the US IRC, each with its clause and an official source
Each page groups the calculators one trade or country uses, with free web calculators on the page, worked examples in that trade's or country's units, common mistakes and the building rules, linked to the official source.

- [Construction calculators by trade and country](https://meistercalc.com/for): the hub, with one 2700 mm stair worked to each country's limits
- Trades: [carpenters](https://meistercalc.com/for/carpenters), [stair builders](https://meistercalc.com/for/stair-builders), [deck builders](https://meistercalc.com/for/deck-builders), [concreters](https://meistercalc.com/for/concreters), [roofers](https://meistercalc.com/for/roofers), [DIY builders](https://meistercalc.com/for/diy)
- Countries: [Australia](https://meistercalc.com/for/australia) (NCC, AS 1684), [New Zealand](https://meistercalc.com/for/new-zealand) (D1/AS1, F4/AS1, NZS 3604), [United Kingdom](https://meistercalc.com/for/uk) (Approved Documents), [United States](https://meistercalc.com/for/us) (IRC, feet and inches), [India](https://meistercalc.com/for/india) (feet and mm, cft and brass, 50 kg cement bags, IS 456 and IS 1077, NBC 2016 stair limits, with a cft, brass and m³ converter)
- Australia guides: [stair requirements under NCC 2025](https://meistercalc.com/blog/stair-rules-australia), [which NCC edition applies in each state](https://meistercalc.com/blog/ncc-2025-adoption-by-state), [noggin spacing in walls, floors and decks](https://meistercalc.com/blog/noggin-spacing), [Cert III Carpentry (CPC30220, CPC30326) maths, unit by unit](https://meistercalc.com/blog/cert-iii-carpentry-maths)

## Comparisons

Facts about other products come from their own store listings and websites, dated on each page; each page says where the other product is the better pick. MeisterCalc is made by the publisher of these pages.

- [All comparisons](https://meistercalc.com/compare)
- [Feature table](https://meistercalc.com/compare#feature-table): MeisterCalc, Chippy Tools, The Chippy Calc, Quick Chippy Plus, Construction Master Pro and Construction Calculator A1 on 17 features (Android, offline, units, plan types, diagrams, building-code checks, calculators), each cell yes, no, partly or unverified with its source, checked 6 November 2026
- Apps: [Chippy Tools](https://meistercalc.com/compare/chippy-tools), [RedX Stairs and Stairs-X](https://meistercalc.com/compare/redx-stairs-and-stairs-x), [Construction Master Pro vs Construction Master 5](https://meistercalc.com/compare/construction-master-pro-vs-construction-master-5), [Construction Calculator A1](https://meistercalc.com/compare/construction-calculator-a1), [Construction Master Pro alternatives](https://meistercalc.com/blog/construction-master-pro-alternatives), [best construction calculator apps for Android](https://meistercalc.com/blog/best-construction-calculator-apps-android)
- Web calculators: [Blocklayer](https://meistercalc.com/compare/blocklayer), [Omni Calculator](https://meistercalc.com/compare/omni-calculator), [Calculator.net and myCarpentry stair calculators](https://meistercalc.com/compare/online-stair-calculators)

## Name

- MeisterCalc is written as one word, from the German Meister (master craftsman) + calc. Said "MY-ster-calc".
- Is MeisterCalc the same as MasterCalc? No. MeisterCalc (meistercalc.com) is a construction calculator app for builders: stairs, roof pitch, concrete, framing. MasterCalc is a separate website with finance calculators.

## More

- [All guides](https://meistercalc.com/blog) (Atom feed: https://meistercalc.com/blog/feed.xml)
- [Can you trust ChatGPT for construction maths?](https://meistercalc.com/blog/can-you-trust-chatgpt-for-construction-maths): where chatbots go wrong on site maths, with sources, and how to check their answers
- [About MeisterCalc and how the guides are checked](https://meistercalc.com/about)
- [Support](https://meistercalc.com/support)
- [Privacy policy](https://meistercalc.com/privacy)