DIY Concrete Calculator
Estimate slabs, patios, walkways, post holes, bags, and costs.
ZeroHour Systems / Android apps
Useful tools, ready when the work is.
Explore practical estimating and field-calculation apps from ZeroHour Systems, each available directly through Google Play.
Purpose-built toolsDirect Google Play links
Browse the collection
Choose the right app for the job.
Search by name or task, or narrow the list by app type and collection.
Browse all appsAndroid · Google Play
DIY Calculators
Focused estimates for home and yard projects.
View on Google Play
DIY Mulch Gravel Soil Calc
Estimate mulch, gravel, soil, sand, and compost for DIY yard projects.
Paver Patio Calculator
Estimate pavers, base, sand, edging, and costs for DIY patios.
DIY Flooring Calculator
Estimate flooring packages, waste, and costs for DIY rooms.
DIY Paint & Drywall Calculator
Estimate paint, primer, and drywall sheets for one DIY room.
DIY Roofing Calculator
Estimate shingles, squares, underlayment, ridge cap, and drip edge.
Deck & Fence Calculator
Estimate fence, deck board, and post-hole materials before you shop.
Field And Trade Tools
Quick calculations for work in the field.
Construction Measure Calc
Fast feet-inch field math with saved calculations and shareable reports.
Electrical Field Calculator
Voltage drop, Ohm's law, and watts-to-amps field estimates.
Plumbing Pipe Calculator
Pipe volume, drain slope, tank volume, and GPM estimates.
HVAC Field Calculator
BTU, CFM, and tonnage estimates for HVAC field checks.
Contractor Bundles
Broader estimating toolsets for mixed jobs.
Landscape Contractor Bundle
Estimate outdoor materials, pavers, drainage, fencing, and reports offline.
Concrete Masonry Calculator
Estimate block, brick, concrete, pavers, and field measurements offline.
Outdoor Construction Bundle
Estimate concrete, pavers, asphalt, fence, masonry, and measurements.
Interior Finish Calculator
Estimate interior rooms, flooring, paint, drywall, and measurements.
Exterior Contractor Bundle
Estimate roofing, siding, gutters, fence posts, and field measurements.
General Contractor Field
Estimate concrete, pavers, roofing, paint, flooring, and site materials.
No apps match those filters.
Try a different search or clear the filters to browse the full collection.
Custom work
Discuss a project Need a tool built for your workflow?
Tell us about the problem and the setting where it needs to work.