Material Summary
- Hangers—
- Fasteners—
- Fastener type—
- Hangers cost—
- Fasteners cost—
- Estimated total—
Joist Hanger Size Chart
| Joist | Hanger | Typical fasteners per hanger |
|---|---|---|
| 2×6 | U26 | 6 |
| 2×8 | U28 | 8 |
| 2×10 | U210 | 10 |
| 2×12 | U212 | 12 |
| I-joist / LVL | Engineered hanger | 10 – 14 |
Match the hanger to the exact joist depth and material; engineered lumber needs engineered hangers.
Hanger Nail / Screw Guide
| Use | Fastener |
|---|---|
| Interior, into header | 10d x 1.5 in joist hanger nails |
| Into joist face | 10d x 1.5 in (do not use roofing nails) |
| Deck / exterior | Hot-dip galvanized or stainless, or structural screws |
| Heavy / engineered | Manufacturer structural screws (e.g. SD/SDS) |
How Many Joist Hangers and Fasteners Do I Need?
You need one hanger for every joist end that lands on a ledger or beam, and a specific number of fasteners for every hanger. Count the joists from your framing width and spacing, multiply by one or two depending on whether the joists are hung at one end or both, and that is your hanger count. Then multiply hangers by the fasteners each one takes, roughly six for a 2×6 up to twelve or more for a 2×12 or engineered joist. This calculator does both, so you do not get home with eighteen hangers and no nails.
Joist Hanger Sizing
The hanger must match the joist depth and the lumber type. A 2×10 takes a 2×10 hanger, not a 2×8 with the joist sticking up, and I-joists and LVL require engineered hangers designed for their thin webs or solid sections. Spacing of 12, 16, or 24 inches on center sets how many joists, and therefore hangers, you need across a given width. Always size to the actual member, since a hanger that is too shallow or too deep will not develop its rated capacity.
Hanger Nails and Screws
The single most common mistake is fastening. Hangers are rated only when every hole is filled with the correct fastener, typically 10d by 1.5 inch joist hanger nails or the manufacturer structural screws, never short roofing nails or drywall screws. Outdoors, use hot-dip galvanized or stainless to match treated lumber. Heavy loads and engineered lumber usually call for structural screws like SDS, which this calculator flags so you buy the right box and enough of them.
Frequently Asked Questions
How many hangers do I need? One per joist end that bears on a ledger or beam; double it if both ends are hung.
How many nails per hanger? Fill every hole, about 6 for a 2×6 up to 12 or more for a 2×12.
Face-mount vs top-flange? Face-mount nails to the beam face and is most common; top-flange hooks over the top.
Can I use any nails? No, use rated joist hanger nails or structural screws, corrosion resistant outdoors.