Estimate exactly how much material to buy before you spend a dollar. This free hub packs seven contractor-grade tools, a deck material calculator, board foot calculator, roof pitch calculator, plus instant concrete, gravel and mulch estimators and a printable construction estimate template. Every result shows its working, so you can trust the math on site.
✓ 100% Free, No Sign-up✓ Trade-Standard Formulas✓ Step-by-Step Working✓ Mobile Friendly
Deck Material Calculator
How many deck boards, joists, screws, and the total deck cost, for your project.
Enter Your Project Details
5.5″ = standard 5/4×6 deck board
Materials You Need
Total Deck Boards
58 boards
Deck area240 sq ft
Board rows26
Boards per row2
Linear feet of decking696 lf
Joists required (16″ OC)16
Deck screws (≈350/100 sq ft)840
Estimated board cost$493.00
🧮 Show the working
Boards run parallel to the deck's long edge. Diagonal or herringbone layouts: raise waste to 15, 20%. Verify joist spans against local building code and species span tables.
Board Foot Calculator
Convert lumber dimensions and quantity into board feet and total cost.
Enter Your Lumber Details
Lumber Volume & Cost
Total Board Feet
80 bd ft
Board feet per piece8 bd ft
Pieces10
Total lumber cost$260.00
🧮 Show the working
Uses the rough-lumber convention: thickness and width in inches, length in feet. One board foot = 144 cubic inches (1″ × 12″ × 12″). Hardwoods are typically sold by the board foot.
Roof Pitch Calculator
Instant roof pitch, slope angle, rafter length and shingle bundles from simple measurements.
Enter Your Roof Details
6 = a "6:12" pitch
Roof Geometry & Materials
Roof Area
859 sq ft
Pitch6:12
Slope angle26.57°
Slope factor1.118
Rafter length (one slope)14.5 ft
Roofing squares (100 sq ft)8.57
Shingle bundles (3/square + waste)29
🧮 Show the working
Assumes a symmetrical gable roof. Valley, hip and dormer cuts typically push waste toward 15%. One roofing square = 100 sq ft; standard architectural shingles ship 3 bundles per square.
Concrete Calculator
Cubic yards and bag counts for slabs, footings, pads and walkways.
Enter Your Slab Details
4″ slab · 6″ driveway · 8″+ footing
Concrete You Need
Concrete Volume (with waste)
1.30 yd³
Volume (exact)1.23 yd³
80-lb bags (0.6 ft³ yield)59 bags
60-lb bags (0.45 ft³ yield)78 bags
Est. ready-mix cost$182.00
🧮 Show the working
Rule of thumb: projects under ~1 yd³ suit bagged mix; larger pours are usually cheaper per yard as ready-mix. Yields used: 80-lb = 0.6 ft³, 60-lb = 0.45 ft³.
Gravel Calculator
How many cubic yards and tons of gravel, crushed stone or river rock you need.
Enter Your Area Details
Driveway: 3, 6″ · Paths: 2, 3″
Gravel You Need
Total Weight Needed
2.85 tons
Volume (with compaction)2.04 yd³
Volume (exact)1.85 yd³
Estimated material cost$156.85
🧮 Show the working
Densities are typical compacted values from supplier tables; exact weight varies with moisture and gradation. Compare bulk $/ton vs bag pricing before ordering.
Mulch Calculator
Cubic yards or bags of mulch for beds, trees and paths, with bulk-vs-bag cost compare.
Enter Your Bed Details
2, 3″ flower beds · 3, 4″ paths & slopes
Mulch You Need
Mulch Volume
1.48 yd³
Bags required (2 cu ft)20 bags
Coverage reminder1 yd³ ≈ 27 cu ft
Bag price total$90.00
Bulk price total$51.80
🧮 Show the working
Keep mulch 3, 6 inches away from trunks and siding to prevent rot and pests. Organic mulch settles ~10% in the first season; top up accordingly.
Construction Estimate Template
Build a printable line-item project estimate in seconds, add rows, apply contingency & tax, print to PDF.
Project Estimate Sheet
Line Item
Qty
Unit
Unit Cost ($)
Line Total
$450.50
$236.00
$68.00
$2,280.00
Materials & labor subtotal$3,034.50
Contingency$303.45
Tax$0.00
Grand total$3,337.95
Grand Total In Words
three thousand three hundred thirty-eight dollars
This template produces an estimate, not a contract. State scope, exclusions, payment terms and validity period on the final document you send clients.
What Is the Construction & Landscaping Calculator Hub?
The Construction & Landscaping Calculator Hub is a free collection of single-purpose material estimator tools built for contractors, builders, landscapers and DIY homeowners. Each tool answers the one question that decides whether a project stays on budget: “how much do I need?” Instead of a single generic calculator, every material gets its own trade-accurate logic, board coverage and gap allowance for decking, board feet for lumber, slope factors for roofing, bag yields for concrete, densities for gravel, and bag counts for mulch, because the wrong assumption on any one of them wastes real money.
Quick answer, how does a construction material calculator work?
It multiplies your project dimensions using trade-standard formulas, e.g., Deck boards = width ÷ (board width + gap) × boards per row × (1 + waste), to convert feet, inches and prices into exact quantities of boards, yards, tons or bags, before you buy.
Bid faster: Contractors can ballpark a deck, slab or landscape job on a phone at the client's property, then confirm with a supplier quote.
Order once: The right waste factor (10, 15% lumber, 10% gravel compaction, 5, 10% concrete) prevents both costly shortages and over-ordering.
Compare like-for-like: Price a project in bagged mulch vs bulk yards, or 80-lb vs ready-mix concrete, with the cost rows built into each tool.
Budget hardwood accurately: The board foot calculator converts any rough-sawn hardwood dimension to the unit yards actually charge by.
Quote professionally: Drop your quantities into the construction estimate template, add contingency and tax, and print a client-ready PDF.
Standard Reference Values (Bookmark These)
Roof Pitch, Angle & Slope Factor Chart
Pitch
Angle
Slope Factor
1,000 ft² footprint → roof area
3:12
14.04°
1.031
1,031 sq ft
4:12
18.43°
1.054
1,054 sq ft
5:12
22.62°
1.083
1,083 sq ft
6:12
26.57°
1.118
1,118 sq ft
8:12
33.69°
1.202
1,202 sq ft
10:12
39.81°
1.302
1,302 sq ft
12:12
45.00°
1.414
1,414 sq ft
Board Feet in Common Lumber Sizes (per piece)
Nominal → Actual size
8 ft
10 ft
12 ft
16 ft
1×4 (¾″×3½″)
1.75
2.19
2.63
3.50
1×6 (¾″×5½″)
2.75
3.44
4.13
5.50
2×4 (1½″×3½″)
3.50
4.38
5.25
7.00
2×6 (1½″×5½″)
5.50
6.88
8.25
11.00
2×8 (1½″×7¼″)
7.25
9.06
10.88
14.50
2×10 (1½″×9¼″)
9.25
11.56
13.88
18.50
Coverage Cheat-Sheet
Material
Rule of thumb
Notes
Decking (5.5″ + ¼″ gap)
2.1 linear ft per sq ft
Add 10, 15% waste
Concrete
45 × 80-lb bags per yd³
4″ slab covers 81 ft² per yd³
Gravel (crushed stone)
1.4 tons per yd³
3″ depth: 1 yd³ ≈ 108 ft²
Mulch
13.5 × 2-ft³ bags per yd³
3″ depth: 1 yd³ ≈ 108 ft²
Shingles
3 bundles per square (100 ft²)
+10% waste, hips/valleys
Deck screws
350 per 100 sq ft
2 screws × joist crossing
Why You Can Trust These Numbers (Our Method)
📐 Trade-Standard Formulas
Every calculator implements the deterministic formulas used in professional takeoffs, coverage math, industry bag yields (80-lb = 0.6 ft³), slope factors and supplier density tables, never black-box guesses.
🧾 Transparent Working
Each result expands to show every intermediate step, matching PraxisCalc's "solved example" approach across all our financial tools, so you can verify the math against your own tape measure.
✅ Human Review & Updates
Default values (prices, densities, yields) are reviewed and refreshed periodically. Last editorial review: July 17, 2026. Found a stale number? Tell us via the contact page.
Editorial note: Our estimates are planning figures for budgeting and purchasing guidance. Structural decisions, joist spans, footing depths, roof framing, must be confirmed against your local building code and, where required, a licensed professional. See our full disclaimer.
Frequently Asked Questions
How much decking do I need?
Divide the deck width by the effective coverage of one board, board width plus gap, converted to feet, to get rows, multiply by boards per row, then add 10, 15% waste. Our deck material calculator does all four steps for you; a 20×12 ft deck with 5.5″ boards and 12 ft board lengths takes 26 rows, about 58 boards (696 linear feet purchased) with 10% waste.
How many deck boards do I need per square foot?
With standard 5.5-inch boards and a 1/4-inch gap, each linear foot of board covers about 0.479 sq ft, so plan on roughly 2.1 linear feet of installed decking per square foot of deck area. Purchased footage runs higher once board-format scrap (rounding each row up to a full board) and 10, 15% waste are included.
What is a board foot?
A board foot is a lumber volume unit equal to 144 cubic inches, a board 1″ thick × 12″ wide × 1 ft long. The formula is Thickness(in) × Width(in) × Length(ft) ÷ 12. Hardwood is priced per board foot at the yard, making this the essential unit when budgeting oak, maple or walnut.
How do you calculate roof pitch and convert footprint to roof area?
Pitch is rise over a 12-inch run (6:12 = 6 inches of rise per foot). Multiply your flat footprint area by the slope factor √(1 + (pitch÷12)²): for a 6:12 roof the factor is 1.118, so a 1,000 sq ft footprint needs shingles for 1,118 sq ft.
How much concrete do I need for a 10×10 slab?
A 10 ft × 10 ft × 4 in slab is 1.23 cubic yards, about 56 × 80-lb bags or 74 × 60-lb bags, before adding 5, 10% for waste. At more than ~1 yd³, ready-mix delivery is usually cheaper and far faster.
How much gravel do I need, and how many tons is that?
Volume = L × W × Depth(in) ÷ 12 ÷ 27 yards. Crushed stone weighs about 1.4 tons per cubic yard (pea gravel 1.35, river rock 1.5), so multiply yards by the density, then add ~10% for compaction.
How many bags of mulch make a cubic yard?
13.5 standard 2-cu-ft bags (or nine 3-cu-ft bags) equal one cubic yard, because a yard is 27 cubic feet. At typical prices, bulk mulch beats bags once you pass roughly 1.5, 2 yards.
What waste percentage should contractors add?
Industry norms: 10, 15% for decking and lumber (more for diagonal layouts), 10% for shingles, 5, 10% for concrete, 10% for gravel (compaction) and ~5% for bulk mulch. Steep or complex projects sit at the top of each range.
Are these calculators free to use on site?
Yes, every PraxisCalc tool is 100% free, runs entirely in your browser (your measurements never leave your device), requires no sign-up, and each one shows its full step-by-step working.
Can I print the construction estimate template as a client quote?
Yes. Fill in line items, set contingency and tax, then press Print / Save as PDF. The print stylesheet strips navigation and other tools so the estimate sheet prints clean, then add your scope, exclusions and payment terms before sending.