Handwerker Toolbox

The Tradesman's Toolbox is the Swiss Army knife for the construction site—a calculator with strips, over 120 specialized formulas, photo dimensioning with laser integration, and practical tools. Completely offline, no registration, no ads.

STRIP CALCULATOR
Each line remains visible and editable—like a strip of paper. Subtotals, blank lines, VAT/discount, custom line labels. Work with multiple strips simultaneously. Tap values ​​to change, swipe to delete (with undo).

SPECIALIZED CALCULATOR—14 TRADES, 120+ FORMULAS
Electrician, plumber/heating engineer, carpenter/joiner, roofer, refrigeration/heat pump, PV/energy system, bricklayer, painter, drywall installer, tiler, and more. Each formula features live calculation, a check mode (traffic light indicator with cross-check), and the option to send to strips.

Interactive drawings: Installation circuit diagrams, stair side profile, tile layout plan, wall elevation at installation height, sheet metal development (profile + cut), freehand sheet metal drawing.

SAT Finder: Azimuth, elevation, and LNB skew for satellite dishes with live compass.

PHOTO DIMENSIONING: Take or upload a photo and dimension it directly: lengths, chains, rectangles, trapezoids, angles, circles, freehand drawing, text, and counterpoints. Custom scale (yellow/black bar) → all other dimensions are calculated automatically. Area and perimeter are calculated from entered dimensions.

Laser distance meter: Connect Bosch GLM and Leica DISTO via Bluetooth — measure, and the value is displayed directly in the measurement field. Remote shutter release in the app.

Send dimensions directly to the strip, mix calculation, or material quantity.

TOOLS

• Inclinometer & Spirit Level — Scale + Bubble Level, Direction Indicator

• Slope Calculator — % ↔ ° ↔ mm/m ↔ Height/Length, Guideline Values

• Right Angle Checker — 3-4-5 Method with Verdict

• Material Quantity — L×W×Thickness, Bags/Tons per Material

• Mixing Ratio — 1:3, 1:2:4, by Total Quantity, Component, or Area

• Cutting Optimizer — Rod/Tube/Sheet, Bin Packing, SVG Visualization

• Converter — 12 Categories (Length, Area, Volume, Mass, Energy, etc.)

• Tables & Knowledge — Copper Pipe, Inch Thread, Cable/Fuse, Wood Densities, Core Hole + 10 Detailed Trade Fact Sheets with Full-Text Search

CONSUMPTION & HOUSEHOLD BOOK
Meter Readings (Electricity, Water), Deliveries (Oil, Pellets, Wood Chips, etc.) Record firewood consumption and costs (chimney sweep, heating service). Bar charts for each category. Printable consumption overview with difference calculation and total costs.

NOTES & PROJECTS
Notes with photos, voice input, GPS location — send via WhatsApp or share. Projects as site folders with photos and dimensions. Printable site report (PDF via print function).

TIME TRIAL
Date, site, activity, start-to, break. Daily and weekly totals, filter by site. Printable list.

CUSTOM FORMULA KEYS
6 freely assignable keys with a custom formula parser (e.g., x*1.2 for a 20% markup).

SETTINGS

• Light/Dark Mode (remembers your choice)

• 5 Color Palettes (Earth, Forest, Steel, Brick, Slate)

• 6 Surface Textures (Wood, Leather, Parchment, etc.)

• Key Size, Line Spacing, Font, Decimal Places
• Save & Load Backup

100% OFFLINE — NO REGISTRATION — NO ADS
All data remains on your device. No tracking, no account, no hidden costs.

Note: Calculations are based on rules of thumb and guidelines and do not replace professional planning, structural analysis, or standards testing. Manufacturer specifications and applicable standards are always binding.

Reliable. Down-to-earth.