How many cubic feet are in a cubic yard?+
There are exactly 27 cubic feet in one cubic yard. One cubic yard is a cube that measures 3 feet × 3 feet × 3 feet, which equals 27 cubic feet. To convert cubic feet to cubic yards, divide by 27. To convert cubic yards to cubic feet, multiply by 27. This is the most important unit conversion in concrete work because volume calculations produce cubic feet when dimensions are in feet, while ready-mix orders in the United States are placed in cubic yards.
How do I convert inches to feet for a concrete calculation?+
To convert inches to feet, divide by 12. Common concrete thickness conversions include 3.5 inches = 0.292 ft, 4 inches = 0.333 ft, 6 inches = 0.5 ft, and 8 inches = 0.667 ft. This conversion is needed when calculating slab, wall, or footing volume by hand with the formula length × width × thickness ÷ 27. ConcreteCalc Pro calculators accept thickness in inches and convert automatically, but if you are doing the calculation manually, dividing thickness by 12 before multiplying is the step most likely to cause an ordering error.
How do I convert cubic yards to cubic meters?+
To convert cubic yards to cubic meters, multiply by 0.7646. To convert cubic meters to cubic yards, multiply by 1.308. For example, 2.5 cubic yards × 0.7646 = 1.91 cubic meters. This conversion is needed when working with international suppliers, metric project drawings, or ready-mix prices quoted in different units. ConcreteCalc Pro calculators display results in both cubic yards and cubic meters, which makes it easier to compare imperial and metric estimates without switching tools.
How many kilograms is an 80 lb bag of concrete?+
An 80 lb bag of concrete weighs approximately 36.3 kilograms because 80 × 0.4536 = 36.3 kg. Other common conversions are 40 lb = 18.1 kg, 60 lb = 27.2 kg, and 90 lb = 40.8 kg. Standard metric bag sizes are 20 kg, which is about 44 lb, and 25 kg, which is about 55 lb. When ordering from international suppliers or comparing with metric products, use the Weight tab in the converter to convert any bag size instantly.
What is the minimum temperature to pour concrete?+
The minimum safe temperature for pouring concrete is 40°F, which is 4.4°C. Below this temperature, the hydration reaction that hardens concrete slows significantly, and below 32°F the water in the mix can freeze before the concrete sets, causing permanent damage. When air temperatures are between 40°F and 50°F, cold-weather concreting measures are required, including warm mix water, insulated forms, and a longer curing period. Do not pour concrete when temperatures are expected to drop below freezing within 24 hours without active heat and insulation.
How do I convert a concrete volume from cubic feet to bags?+
To convert cubic feet to bags, first convert cubic feet to cubic yards by dividing by 27, then divide by the yield per bag. For 80 lb bags, the working yield is about 0.022 yd³ each, so the formula is bags = (cubic feet ÷ 27) ÷ 0.022. For example, 10 cubic feet becomes 0.370 yd³, and 0.370 ÷ 0.022 is about 17 bags when you include practical ordering overage. The concrete bag calculator is faster if you want counts for all bag sizes at once.
What is the difference between a short ton and a metric ton for concrete?+
A short ton, which is used in the United States, equals 2,000 pounds or about 907 kilograms. A metric ton, also called a tonne, equals 1,000 kilograms or about 2,205 pounds. Concrete weighs roughly 150 lb per cubic foot, which is about 2,400 kg per cubic meter, so one cubic yard of concrete weighs around 4,050 lb. That is about 2 short tons or 1.84 metric tons. This matters when estimating structural loads, comparing aggregate prices, or checking truck payload capacity.
How do I convert square feet to square meters for concrete formwork?+
To convert square feet to square meters, multiply by 0.0929. To convert square meters to square feet, multiply by 10.764. For example, 200 square feet of formwork equals 200 × 0.0929 = 18.6 square meters. This conversion is useful when ordering plywood or form panels in metric sizes, or when comparing formwork costs with international contractors. The Area tab in the converter above lets you switch between square feet, square yards, square inches, and square meters instantly.