Free tools
Construction calculators that show their work
Eleven deterministic planning tools. No sign-up, no email wall, no hidden math — every formula, assumption, limitation, worked example, and FAQ is printed on the page. These are planning aids, not quotes.
Deck Material Calculator
Joists, decking, fasteners, footings, and concrete bags for a rectangular deck.
Open calculatorPaint Estimator
Finish and primer gallons from wall area, coats, and coverage.
Open calculatorDrywall Calculator
Sheets, mud, tape, and screws from wall and ceiling area.
Open calculatorRoofing Calculator
Squares, bundles, underlayment, and nails from roof area and pitch.
Open calculatorConcrete Volume Calculator
Cubic yards and bag counts for slabs and pads.
Open calculatorFlooring Calculator
Square footage with waste, box counts, and underlayment.
Open calculatorSiding Calculator
Squares to order from wall area, openings, and waste.
Open calculatorFence Material Calculator
Posts, pickets, rails, and post concrete for a straight run.
Open calculatorMarkup Calculator
Price from cost and markup — and the margin that markup really produces.
Open calculatorMargin Calculator
Gross profit, margin %, and equivalent markup from cost and price.
Open calculatorContractor Time-Cost Calculator
The weekly hours estimating, scheduling, and job-cost admin really take.
Open calculator
Certified benchmark · 2026-08-21
In 520 certified profile-mode generations across 26 supported Instant assemblies on Windows (profile/AOT) and an Android API 36 emulator, supported jobs became editable estimates in a median of 0.028 seconds (rounded); the measured 95th percentile was 48.008 milliseconds (approximately 0.048 seconds), with 0 generative-AI provider calls.
- median, supported jobs
- 0.028 sec
- certified generations
- 520
- supported assemblies
- 26
- failures · 0 AI provider calls
- 0
Certified supported jobs only. Editable output; contractor pricing and field verification remain in control. Full methodology and results
See it run on your own jobs
The private Drevanto beta is the real, editable product — not a website demo. Apply, and we will follow up by email.