Free construction tools

Construction calculators

Quantity, cost, and conversion calculators built on standard estimating conventions. Every tool prints its formula under the results so you can check the math, and none of them ask for an email.

Quantities & materials

Concrete Calculator

Slabs, footings, and columns in cubic yards, with bag counts for small pours.

Run Concrete

Rebar Calculator

Bar counts from grid spacing, plus weight and tons by bar size.

Run Rebar

Board Foot Calculator

Lumber board feet and cost, with nominal sizes and the hardwood quarter system.

Run Board Foot

Stud Calculator

Studs, plates, and sheathing for wall framing at 16 or 24 inch spacing.

Run Stud Count

Decking Calculator

Deck boards, joists, and fasteners from deck dimensions and layout.

Run Decking

Paint Calculator

Gallons from wall area, coats, and coverage, with door and window deductions.

Run Paint

Gravel Calculator

Cubic yards and tons for paths and driveways, by material density.

Run Gravel

Asphalt Calculator

Hot-mix tonnage from area and depth, with driveway build-up guidance.

Run Asphalt

Costs & pricing

Markup & Margin Calculator

Turn direct cost into a bid with overhead and profit, and see the real margin.

Run Markup & Margin

Cost per Sq Ft Calculator

Construction cost per square foot for quick project-level comparisons.

Run Cost per Sq Ft

Concrete Estimator

Price a slab pour: yards with waste, ready-mix dollars, and pump costs.

Run Concrete Cost

House Cost Calculator

Planning-level build cost range by size and quality tier, from public data.

Run House Cost

Bid strategy

Core

Bid Pipeline Velocity

Revenue per day from bids out, hit ratio, contract value, and cycle time.

Run Bid Velocity

What-If

Bid Price-Cut Simulator

What a price cut does to margin, and the hit ratio it takes to break even.

Run Price-Cut Sim

Diagnostic

Bid Go/No-Go Scorer

Score a pursuit on eight weighted criteria before you spend estimating hours.

Run Go/No-Go

Conversions & geometry

Unit Converter

Convert between sf, sy, cy, board feet, and roofing squares.

Run Unit Converter

Roof Pitch Calculator

Pitch to slope factor and true roof area from the footprint.

Run Roof Pitch

Calculators price one line. Ruh prices the whole bid.

AI takeoff reads your plan set, counts every trade, and drafts a priced estimate on your own price book.

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Looking for definitions instead? The construction glossary covers the terms these tools use, and the estimating guides walk through the full method.

Figures on this page are illustrative. Construction estimates depend on project-specific conditions, source documents, market pricing, and professional judgment. Ruh's AI assists the estimator and does not replace professional review: your team reviews, validates, and approves every estimate, bid, and pricing decision.