A: Fits.ovh exists because the gap between nominal and actual dimensions causes real problems on job sites. A contractor ordering a "2x4" expects 2" x 4", a plumber needs to know if a pipe fits through a hole, and a DIYer measuring twice still gets it wrong. This site is built for contractors, plumbers, carpenters, blacksmiths, apprentices, and anyone who works with materials where what you call something isn't what you measure. If you've ever lost time on a job, wasted materials, or second-guessed yourself on dimensions, this site is for you.

A: In the early 1900s, lumber was sold "green" and rough-cut at exactly 2x4. However, modern lumber is kiln-dried (which causes shrinkage) and planed smooth on all four sides (S4S) to make it easy to handle. This processing brings it down to the standard 1.5" x 3.5".

A: No. Plumbing sizes refer to the nominal inside diameter. The Outside Diameter (OD) is always larger to account for wall thickness. For example, a 1/2" PVC pipe has an OD of 0.840", meaning you need at least a 7/8" hole for it to fit.

A: Lumber weight depends on species and moisture. Standard Douglas Fir weighs approx. 1.28 lbs per linear foot for a 2x4. If you are using Pressure Treated wood, it can be 30-50% heavier due to the chemical saturation. Use our Project Calculator to estimate your total load.

A: Both have the same Outside Diameter (OD), so they use the same fittings. However, Type L has thicker walls and is used for residential water lines, while Type M is thinner and typically used for heating systems. Type L is rated for higher pressure.

A: Both have the same OD, but Schedule 80 has thicker walls (smaller ID) and is rated for higher pressure. Schedule 40 (white) is standard for residential plumbing. Schedule 80 (gray) is used in industrial and high-pressure applications.

A: No. The chemicals used to treat wood (like ACQ) are highly corrosive to standard steel. You must use Hot-Dipped Galvanized or Stainless Steel fasteners. Using regular screws will cause premature failure and black staining.

A: Modern plywood is slightly thinner than its nominal name due to manufacturing tolerances and sanding. A nominal 3/4" sheet is actually 23/32" (about 0.72"). This is important when planning dados, rabbets, or tight-fitting joints.

A: Check your vehicle's GVWR (Gross Vehicle Weight Rating) on the door jamb sticker. Subtract the vehicle's curb weight and passenger weight to find your cargo capacity. As a rule of thumb, standard half-ton pickups cap at 1,500-2,000 lbs of payload.

A: Drill 1/8" to 1/4" larger than the pipe's Outside Diameter (OD) for clearance. For example, 1/2" copper (OD: 0.625") needs a 3/4" hole. If the pipe needs to move for thermal expansion, add more clearance and use a grommet.

A: Calculate the total surface area of your lumber (all four sides). Most paints cover 350-400 sq ft per gallon. For rough or porous wood, expect lower coverage. Use our Surface Area Calculator on each material's detail page.