Blok: Construction Calculator

The Swiss army knife of the jobsite — the app tradespeople were waiting for. 76 pro calcs, client quote PDF in 30 seconds, all your projects organized. Offline.

The Swiss army knife of the jobsite: the app tradespeople and DIYers were waiting for. 76 pro calculations across 10 modules, client quote PDF mode, Project mode for your jobsites. All in one app, 100% offline, in 6 languages.

Designed in France for masons, roofers, tilers, electricians, plumbers, plasterers and serious DIYers tired of stray sheets and calculations scribbled on the back of a cement bag.

GET IT RIGHT, FIRST TIME

Enter your dimensions, get the exact result in seconds. All formulas are based on industry-standard professional norms (DTU, NF, NF C 15-100, with equivalents to IBC, BS, DIN). No more headaches with roof truss trig, soil bulking, or cable voltage drop. Blok does it for you.

YOUR JOBSITES, FINALLY ORGANIZED

The Project mode groups all calculations from a jobsite in one place: roof estimating, concrete dosing, paint surface, cable length. You find every number in two taps and compare two variants in three.

SEND YOUR QUOTE WITHOUT LEAVING THE JOBSITE

Turn your calculations into a real professional client quote:

• Header with your logo, company name, registration number and VAT. • Sequential numbering compliant with legal requirements (FR/DE/ES/IT/PT/UK). • Line items: unit price (excl. VAT), subtotal, VAT, total, notes and conditions. • Export PDF sendable by email, WhatsApp or AirDrop in one tap.

THE 10 PRO MODULES

MASONRY: Concrete dosing, cement bags, slab, blocks, mortar, screed, strip footing, formed wall, stairs.

PLASTERING: Drywall, screws, joint tape, rails and studs, thermal R-value, U-value of multilayer walls.

TILING: Tiles per sqm, glue, grout, baseboards, floating floor, vinyl flooring, diagonal layout.

PAINTING: Wall surface (with openings), ceiling, quantity, primer, wood varnish.

ROOFING: Slope, rafter length, 2 or 4 pitched roof area, tiles, battens, frame, gutters and downspouts.

ELECTRICAL: Ohm's law, single and three-phase power, cable section, voltage drop, sockets per circuit per electrical code.

PLUMBING: Water heater volume, pipe diameter, PVC drain slope, radiator power, boiler, head loss.

EARTHWORKS: Excavation volume, soil bulking, material tonnage, number of truckloads, drainage slope.

GEOMETRY: Areas, volumes, Pythagoras and 3-4-5 squaring, trigonometry, rule of three.

CONVERSIONS: Length, area, volume, mass, temperature, pressure, energy.

OFFLINE AND PRIVATE BY DESIGN

Everything works without an internet connection: Blok runs in a basement just as well as in the middle of nowhere. Your calculations, projects and quotes never leave your iPhone. No account to create, no cloud, no third-party tracker. Available in French, English, Spanish, German, Italian and Portuguese.

DISCLAIMER

Results provided by Blok are indicative. They do not replace industry standards (DTU, NF, EN, DIN, IBC, BS) nor the advice of a structural engineering firm. The user remains responsible for implementation.

Blok offers optional in-app purchases to unlock all features. Any subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period, and can be managed at any time from your Apple account.

Terms of Use: https://blok.devolim.fr/en/legal/terms.html Privacy: https://blok.devolim.fr/en/legal/privacy.html Support: contact.blok@devolim.fr

Blok is published by DEVOLIM (BAUGEY MATHEO), a French sole trader. SIREN 948 000 757, Bordeaux RCS.