Short answer: open Studmark on your phone, type the wall length, pick 16" OC (or whatever you're framing at), and tap Print Layout Template. You get a dimensioned strip with every stud position marked from the wall start. Cut it out, lay it on your bottom plate, transfer the marks. No re-measuring, no mental math, no walking a tape down the wall twice.
Stud calculators output a number. "You need 9 studs." Great. Where do they go? Most tools shrug. Studmark is built around the printable strip because that's the one piece of paper that actually saves time on the jobsite.
What a stud spacing template actually is
A stud spacing template is a paper strip, printed to scale (or with clearly labeled distances), that shows where every stud falls along a wall. First stud at 0". Next at 16". Next at 32". And so on, until the end stud at the wall length.
The template replaces the ritual of pulling a tape, hooking it on one end of the bottom plate, and walking it the full length of the wall while marking every interval with a square. On an 8-foot wall that's fine. On a 24-foot exterior with 18 studs, it's where mistakes happen. A slipped tape, a misread number, a stud landing 14-3/4" off instead of 16".
A printed template lets you transfer marks from paper to plate in one pass. It also doubles as a check: if your template says stud #7 should be at 96", and your plate mark lands at 95-1/2", you know something drifted before you cut a single board.
The catch is most stud calculators don't produce one. They produce a stud count. Studmark produces both, and the template is the whole reason the tool exists.
How do I calculate stud spacing at 16 inches on center?
Type your wall length into the input. Feet and inches, or decimal feet, whichever is faster. Studmark accepts "12 ft 6 in" or "12.5 ft" without arguing about format. Pick 16" on the spacing selector. It's the default, since that's the residential framing standard in the US.
The math: first stud at 0", another stud every 16", and an end stud at the wall length if it doesn't already land on a 16" mark. For an 8-foot wall (96"), that's studs at 0", 16", 32", 48", 64", 80", and 96". Seven studs. For a 12-foot wall (144"), it's 0" through 144" in 16" steps plus the end stud. Ten studs. The number updates in under 100 milliseconds as you change inputs, so you can sweep through wall lengths to compare framing options without reloading anything.
The diagram updates with the count. Vertical lines for each stud, dimension labels between them, scaled to whatever fits on your phone screen. If your stud count goes past 30 (a long exterior wall, say), labels print at every fifth stud so the diagram stays readable instead of turning into one long blur.
What is 16 inch on center stud spacing?
"On center" means the distance from the center of one stud to the center of the next. 16" OC means stud centerlines fall every 16 inches along the wall, which works out to 14-1/2" of clear bay between 1-1/2"-wide studs. It's the dominant residential standard in the US for load-bearing walls. It lines up cleanly with 4-foot and 8-foot sheet goods (drywall, OSB, plywood), and it carries typical residential roof and floor loads with standard 2x4 framing.
24" OC is the other common spacing. It's used for non-load-bearing partitions, some advanced framing assemblies, and 2x6 exterior walls where the larger stud size compensates. 12" OC is overbuilt for most residential use but shows up in tall walls, heavily loaded headers, or where finish materials need extra backing. 19.2" OC is the oddball: five studs per 8-foot bay, used in some engineered floor systems.
Studmark presets all four (12, 16, 19.2, 24) and lets you punch in a custom number if you're working metric (600mm spacing comes out to 23.62") or to a non-standard layout. Out-of-range values get a friendly warning instead of an error. The calculation still runs, because somebody framing a fence panel doesn't need a tool yelling at them.
How many studs do I need for a 12-foot wall?
At 16" OC: ten studs (positions at 0, 16, 32, 48, 64, 80, 96, 112, 128, 144 inches). At 24" OC: seven studs. At 12" OC: thirteen studs. Studmark prints the exact stud count above the diagram in big text. Large enough to read at arm's length when your phone's sitting on the deck and your hands are full.
The count alone doesn't tell you how much lumber to order. You also need plate boards. Studmark calculates linear feet of plate stock, plus the number of 8-footers and 16-footers required, for both top and bottom plates. There's a toggle for single versus double top plate. Single for interior partitions in some cases, double for most load-bearing situations. Switching between them updates the plate count instantly so you can see the lumber delta before you call the yard.
Then there's waste. A 0%, 5%, 10%, or 15% adjustment, with 10% as the default. Tradespeople know studs warp, plates split, and somebody always cuts one too short. The waste-adjusted count shows up next to the base count, so you're never guessing whether the number on screen is "what the wall needs" or "what to put on the order."
How do I print the template on my phone?
This is the part that's usually broken. The most-recommended free framing calculator online, Blocklayer, renders at about 0.4x viewport on mobile. You can use it on a desktop at the office, but on a phone at the jobsite it's a pinch-zoom nightmare. Other tools either skip print entirely or generate a PDF that mangles its own dimensions.
Studmark prints through CSS @media print and the browser's native print dialog. On iOS Safari that means tapping "Print Layout Template" pops the share sheet. You can save to PDF, AirPrint to a wireless printer, or send to a paper printer back at the shop before you head out. On Android Chrome it's the same flow with Google's print dialog. No jsPDF, no plugins, no library that breaks every time Safari ships a release.
The output is a horizontal dimensioned strip showing every stud position with distance from wall start, the wall total length at the top, the spacing setting, a scale bar, and stud position numbers along the bottom. Walls with more than 20 studs wrap cleanly across multiple rows so nothing gets truncated. Print on standard 8.5x11, cut along the strip line, and you've got a layout guide that fits in a tool belt.
Why most stud calculators stop one step short
Ten competitor tools were reviewed before Studmark was built. The printable layout strip showed up in none of them. The number gets calculated everywhere. The diagram shows up in a few. Cost estimates and IRC-compliance flags show up in the more polished ones. Nobody ships the strip.
That's the gap Studmark fills. Free, ad-supported, no signup, no app install, no account. The whole tool runs in the browser. Type a wall length, get a stud count and a printable template, walk back to the plate, and start marking.
Try Studmark. Built for one wall at a time, designed for the phone in your nail apron.