Size Charts
Reference size charts for the workshop, job site, garage, and home: drill bits, screws, wire, rebar, plywood, tires, beds, and propane tanks. Every number is taken from the published standard or cross-checked across sources, and each chart comes with a converter or calculator.
Hardware & tools
Electrical
Construction
Automotive
Home & outdoor
Sports & outdoor
Quick answers
The questions people look up most often, answered from the same data as the full charts.
What size is a queen bed?
A queen mattress is 60 × 80 inches. A king is 76 × 80, and a California king trades width for length at 72 × 84.
See the bed size chart
How thick is 3/4 plywood really?
3/4" plywood is actually 23/32" thick. Plywood is sold by a nominal size, and the actual panel is slightly thinner, which matters when you cut dadoes or stack layers.
See the plywood thickness chart
What diameter is 12 gauge wire?
Solid 12 AWG copper is 0.0808 inches (2.05 mm) across. Every 6 gauge numbers the diameter roughly halves, and a smaller number means a thicker wire.
See the wire gauge chart
What drill bit do I use for a 1/4-20 tap?
A #7 drill (0.201", 5.11 mm). For metric coarse threads the rule is diameter minus pitch, so an M6 × 1 tap takes a 5 mm drill.
See the tap drill chart
What size is #4 rebar?
From #3 to #8 the bar number is the diameter in eighths of an inch, so #4 is 0.5" in diameter (metric size 13) and weighs 0.668 lb per foot.
See the rebar size chart
How many gallons are in a 20 lb propane tank?
About 4.8 gallons. The "20 lb" is the weight of propane it holds, and propane weighs about 4.2 lb per gallon.
See the propane tank size chart
What does 225/65R17 mean?
225 mm wide, with a sidewall 65% as tall as the width (5.8"), on a 17" wheel. That makes the tire about 28.5" tall overall.
See the tire size chart
How to use a size chart
Start with what you can measure. If you have a bolt, a drill bit, or a wire in hand, measure its diameter with calipers and find the closest row. If you're shopping, start from the name on the label and read across to the real dimensions before you buy.
Check which system you're in. Many charts mix inch, metric, and numbered sizes, and a size that looks close in one system can be wrong in another. Every chart here shows inches and millimeters side by side, and most include a converter so you don't have to do the math by hand.
When a measurement falls between two rows, decide which direction is safe. For a clearance hole that a bolt slides through, go to the next larger size. For a tap drill, use the size the chart lists: a bigger hole leaves shallower threads that strip more easily.
About these charts
Where does the data in these size charts come from?
Each chart is built from the standard that defines it, such as ASME B94.11M for drill bits, ASTM B258 for wire gauge, ISO 261 for metric threads, and ASTM A615 for rebar, and cross-checked against at least one other published table. Where there is no single standard (mattress sizes, propane tank dimensions), the chart says so and shows the range sources give. Every page lists its sources.
Why are nominal sizes different from actual sizes?
Many building products are named by a traditional or nominal size and then made slightly smaller, like 3/4-inch plywood that measures 23/32 inch. Other names are codes rather than measurements: rebar numbers from #3 to #8 count eighths of an inch, and wire gauge numbers get smaller as the wire gets thicker. Each chart shows both the name and the real dimension.
Can I print these charts?
Yes. Use your browser's print command; the menus and calculators are hidden so only the charts print.