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Construction Unit Converter

Instantly convert between every unit you'll use on a jobsite. Length, area, volume, weight, concrete, roofing, lumber, and more.

Length Conversions

Convert between inches, feet, yards, miles, millimeters, centimeters, and meters.

Enter any value — all units update instantly

Inches (in)

Feet (ft)

Yards (yd)

Miles (mi)

Millimeters (mm)

Centimeters (cm)

Meters (m)

Quick Reference

From	To	Multiply By
Inches	Feet	÷ 12
Feet	Yards	÷ 3
Feet	Meters	× 0.3048
Inches	Millimeters	× 25.4
Yards	Meters	× 0.9144
Miles	Feet	× 5,280

Area Conversions

Convert between square inches, square feet, square yards, square meters, and acres.

Enter any value — all units update instantly

Square Inches (in²)

in²

Square Feet (ft²)

ft²

Square Yards (yd²)

yd²

Square Meters (m²)

m²

Acres

acres

Roofing Squares (1 square = 100 ft²)

squares

Quick Reference

From	To	Multiply By
Sq Feet	Sq Yards	÷ 9
Sq Feet	Sq Meters	× 0.0929
Sq Feet	Acres	÷ 43,560
Sq Yards	Sq Meters	× 0.8361
Sq Feet	Roofing Squares	÷ 100

Volume Conversions

Convert between cubic inches, cubic feet, cubic yards, gallons, liters, and cubic meters.

Enter any value — all units update instantly

Cubic Inches (in³)

in³

Cubic Feet (ft³)

ft³

Cubic Yards (yd³)

yd³

Gallons (US)

gal

Liters (L)

Cubic Meters (m³)

m³

Quick Reference

From	To	Multiply By
Cubic Yards	Cubic Feet	× 27
Cubic Feet	Gallons	× 7.481
Gallons	Liters	× 3.785
Cubic Yards	Cubic Meters	× 0.7646
Cubic Feet	Cubic Inches	× 1,728

Weight Conversions

Convert between ounces, pounds, tons, kilograms, and metric tons.

Enter any value — all units update instantly

Ounces (oz)

Pounds (lbs)

lbs

US Tons (short tons)

tons

Kilograms (kg)

Metric Tons (tonnes)

tonnes

Common Material Weights

Material	Weight per Cubic Yard	Weight per Cubic Foot
Concrete	4,050 lbs	150 lbs
Gravel (dry)	2,700 lbs	100 lbs
Sand (dry)	2,700 lbs	100 lbs
Topsoil	2,200 lbs	81 lbs
Mulch	400-800 lbs	15-30 lbs
Asphalt (hot mix)	3,915 lbs	145 lbs
Water	1,685 lbs	62.4 lbs

Concrete Conversions

Convert between cubic yards, cubic feet, bags (80lb & 60lb), wheelbarrow loads, and mixer batches.

Enter any value — all units update instantly

Cubic Yards

yd³

Cubic Feet

ft³

80 lb Bags (0.6 ft³ each)

bags

60 lb Bags (0.45 ft³ each)

bags

Wheelbarrow Loads (~3 ft³ each)

loads

Weight (lbs @ 150 lbs/ft³)

lbs

Quick Reference

Unit	Equivalent
1 Cubic Yard	27 cubic feet
1 Cubic Yard	45 × 80lb bags
1 Cubic Yard	60 × 60lb bags
1 Cubic Yard	~4,050 lbs
1 Cubic Yard	9 wheelbarrow loads
1 Cubic Foot	~150 lbs

Roofing Conversions

Convert between roofing squares, square feet, shingle bundles, and rolls.

Enter any value — all units update instantly

Roofing Squares (1 square = 100 ft²)

squares

Square Feet

ft²

Shingle Bundles (3 per square)

bundles

Underlayment Rolls (4 ft × 250 ft = 1,000 ft²)

rolls

Starter Strip (LF = perimeter)

Ridge Cap Bundles (25 LF per bundle)

bundles

Pitch Multipliers

Pitch	Multiplier	Degrees
3:12	1.031	14.0°
4:12	1.054	18.4°
5:12	1.083	22.6°
6:12	1.118	26.6°
8:12	1.202	33.7°
10:12	1.302	39.8°
12:12	1.414	45.0°

Lumber Conversions

Board feet, linear feet, nominal vs actual dimensions, and sheet goods.

Board Foot Converter

Nominal Thickness (in)

Nominal Width (in)

Length (ft)

Quantity (pieces)

pcs

Results

Board Feet5.33

Linear Feet8

Actual Size1.5" × 3.5"

Sq Ft Coverage2.33

Nominal vs Actual Lumber Sizes

Nominal	Actual	BF per Foot
2 × 4	1.5" × 3.5"	0.667
2 × 6	1.5" × 5.5"	1.0
2 × 8	1.5" × 7.25"	1.333
2 × 10	1.5" × 9.25"	1.667
2 × 12	1.5" × 11.25"	2.0
4 × 4	3.5" × 3.5"	1.333
6 × 6	5.5" × 5.5"	3.0

Temperature Conversions

Convert between Fahrenheit and Celsius. Important for concrete curing, adhesive application, and paint conditions.

Fahrenheit

°F

Celsius

°C

Construction Temperature Thresholds

Threshold	°F	°C	Relevance
Freezing	32°F	0°C	No concrete pouring, no exterior paint
Cold weather concrete	40°F	4°C	Requires heated enclosures or blankets
Min paint application	50°F	10°C	Latex paint minimum temperature
Ideal concrete curing	50–75°F	10–24°C	Best strength development range
Hot weather concrete	90°F+	32°C+	Requires retarder, shade, cold water
Adhesive/sealant max	95°F	35°C	Most adhesives lose bond above this

Pressure & Concrete Strength

Convert between PSI, kPa, MPa, and common concrete mix strengths.

Enter any value — all units update instantly

PSI (lbs per square inch)

PSI

kPa (kiloPascals)

kPa

MPa (megaPascals)

MPa

Bar

bar

Common Concrete Mix Strengths

Application	PSI	MPa
Residential footings	2,500 PSI	17.2 MPa
Standard slabs & driveways	3,000 PSI	20.7 MPa
Garage floors & sidewalks	3,500 PSI	24.1 MPa
Commercial floors	4,000 PSI	27.6 MPa
Structural columns	5,000 PSI	34.5 MPa
High-strength structural	6,000+ PSI	41.4+ MPa

Slope & Grade Conversions

Convert between rise:run ratios, percent grade, and degrees. Essential for grading, drainage, ramps, and roofing.

Enter rise and run — or any output to reverse-calculate

Rise (in or ft)

rise

Run (in or ft, same unit as rise)

run

Percent Grade (%)

Degrees (°)

Ratio (X:12)

:12

Common Slopes in Construction

Application	Slope	% Grade	Degrees
Flat roof (minimum)	1/4" per ft	2.08%	1.2°
Drainage grading	1" per ft	8.33%	4.8°
ADA ramp (max)	1:12	8.33%	4.8°
Driveway (typical)	1–8%	1–8%	0.6–4.6°
Low-slope roof	3:12	25%	14.0°
Standard roof	6:12	50%	26.6°
Steep roof	12:12	100%	45.0°

Why Every Contractor Needs a Unit Converter

Unit conversions are one of the most common sources of costly mistakes on construction projects. A simple error — confusing cubic feet with cubic yards, or square feet with roofing squares — can mean ordering 9× too much or too little material.

Common Conversion Mistakes

Cubic feet vs. cubic yards: 1 cubic yard = 27 cubic feet. Ordering "27" cubic yards when you meant cubic feet means 27× too much concrete.
Roofing squares vs. square feet: 1 square = 100 sq ft. A 20-square roof is 2,000 sq ft, not 20 sq ft.
Board feet vs. linear feet: Board footage accounts for width and thickness. A 2×12 at 8 feet is 16 board feet, not 8.
Tons vs. cubic yards: Gravel is sold by the ton but measured by the cubic yard. You need to know the material density to convert.

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