What size do I need?
Fast size calculators for real purchases and projects
Start with TV dimensions today. Next up: drill bits, anchors, generators, air conditioners, rugs, and other everyday sizing decisions where a quick chart or calculator saves a second trip to the store.
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Quick answers for common sizing questions
Use these guides when you need the right bit, pilot hole, anchor, screen size, or project size before you start drilling, mounting, shopping, or measuring.
What Size Drill Bit for Screws?
Find common pilot-hole drill bit sizes for wood screws, including #6, #8, #10, and #12 screws.
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What Size Drill Bit for a #6 Screw?
Pilot-hole sizes for #6 wood screws in hardwood and softwood, plus countersink guidance.
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What Size Drill Bit for a #8 Screw?
Pilot-hole sizes for #8 wood screws in hardwood and softwood, including tapered-bit sizes.
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What Size Drill Bit for a #10 Screw?
Pilot-hole sizes for #10 wood screws in hardwood and softwood, plus countersink size.
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What Size Drill Bit for a #12 Screw?
Pilot-hole sizes for #12 wood screws in hardwood and softwood, with tapered-bit alternatives.
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What Size Drill Bit for Wall Anchors?
Quick wall anchor drill bit sizes for common screw ranges, plus when to size up or check the package first.
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What Size Drill Bit for a Drywall Anchor?
Common drywall anchor drill bit sizes and how to choose the right hole for plastic, self-drilling, and toggle anchors.
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What Size Drill Bit for a Concrete Anchor?
Concrete anchor drill bit sizing rules for wedge anchors, sleeve anchors, and masonry fasteners.
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What Size Hole for a Toggle Bolt?
Quick toggle bolt hole sizing guidance for drywall and hollow walls.
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What Size Drill Bit for a Masonry Screw?
Pilot bit sizing guidance for concrete and masonry screws, including why brand-specific bits matter.
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What Size Pilot Hole for a Wood Screw?
A quick wood screw pilot-hole chart for common #6, #8, #10, and #12 screws.
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What Size Tap Drill Bit?
Common tap drill sizes for UNC threads such as #8-32, #10-24, 1/4-20, and 5/16-18.
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What Size Drill Bit for a 1/4-20 Tap?
Use a #7 drill bit for a 1/4-20 tap, plus notes on material, thread depth, and common mistakes.
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What Size Drill Bit for a 10-24 Tap?
Use a #25 drill bit for a #10-24 tap, with quick decimal and metric equivalents.
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What Size Drill Bit for an 8-32 Tap?
Use a #29 drill bit for an #8-32 tap, with decimal size and practical tapping tips.
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What Size Drill Bit for a 5/16-18 Tap?
Use an F drill bit for a 5/16-18 tap, with decimal and metric equivalents.
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What Size Drill Bit for a 3/8-16 Tap?
Use a 5/16 inch drill bit for a 3/8-16 tap, with quick tapping guidance.
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What Size Drill Bit for a 1/2-13 Tap?
Use a 27/64 inch drill bit for a 1/2-13 tap, with decimal and metric equivalents.
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What Size Generator Do I Need?
A practical generator sizing guide for backup power, running watts, starting watts, and safe next steps.
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How to use these guides
1. Start with the exact size
Check the quick answer first, then confirm it against the chart for your material or thread type.
2. Check the situation
Hardwood, softwood, drywall, concrete, and metal all change how forgiving the size can be.
3. Measure once more
If the package or manufacturer gives a different size, use that number first.