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This is two builds in one footprint: a pair of deep, comfortable benches with backrests, and — when you pull four pins and rotate the backs flat — a full picnic table. The mechanism is honest hardware: each backrest pivots on a 1/2" bolt through the back legs, and a second removable bolt acts as the locking pin in one of two positions, tabletop or backrest.
The source builders are candid about the trade-off, and it's worth repeating: this design is a better BENCH than it is a picnic table. The wide seat that makes the bench luxurious also makes climbing into table mode less graceful than a purpose-built picnic table. If you'll live in table mode, build the dedicated picnic table instead; if you want great benches that host the occasional cookout, this is the one.
The craft note that matters: the pin holes are drilled IN PLACE, with a level clamped across the rotated tabletop, then again at your preferred backrest angle. That's the right method — drilling them from measurements would trust the drawing over your actual assembly, and the pins only slide sweetly when the holes were drilled through the real thing. Four leg assemblies are built two-left, two-right; the plan warns it matters, and it does.
| Item | Qty |
|---|---|
| 2x6, 8 ftSeats, tabletop boards, and tabletop supports. | 7 each |
| 2x4, 8 ftLegs and back supports. | 5 each |
| Exterior deck screws, #9 x 2-1/2", star drive | 80 each |
| Bolts, 1/2" x 4", with washers and nutsFour pivots, four pins. Galvanized or stainless — these get pulled and re-seated for years. | 8 each |
| Exterior wood glue | 8 oz |
| Exterior finish | 1 quart |
Overall cost: $$. Lumber prices vary by region, species, and season, so we give a band rather than a figure we would only be pretending to know.
| Part | Qty | T × W × L |
|---|---|---|
| Back legsBoth ends 10° off square, parallel, long point to short point. These carry the pivot and pin holes. | 4 | 1 1/2" × 3 1/2" × 28 7/8" |
| Seat supportsShort point to short point, both ends 10° off square, NOT parallel. | 4 | 1 1/2" × 3 1/2" × 27" |
| Front legsBoth ends 10° off square, parallel, long point to short point. | 4 | 1 1/2" × 3 1/2" × 16 3/4" |
| Seat and tabletop boards2x6Three per bench seat, three per tabletop half. | 12 | 1 1/2" × 5 1/2" × 47 7/8" |
| Tabletop supports2x6 | 4 | 1 1/2" × 5 1/2" × 17" |
| Bottom back supports | 2 | 1 1/2" × 3 1/2" × 41" |
Buy 17 boards at 8 ft.
12 boards
5 boards
Assumes 8 ft stock, a 1/8" saw kerf, and buying each part at its own width. Change the board size or kerf on the full board plan →
Cut list makes TWO benches that convert to ONE picnic table. Before lumber: the source builders found this most comfortable as a bench — the wide seat is great to sit on and slightly awkward to swing legs over in table mode. Mostly-table users should build a conventional picnic table; mostly-bench users are in exactly the right place.
Drill a 1/2" hole centered near the top of all four back legs. Drill straight — these are the axles the whole transformation swings on. A drill press is nice; careful freehand with a speed square sighted from two directions works.
Lay a front leg over a back leg's bottom, edges flush, and trace the front leg's top edge — that line locates the seat support. Glue and screw the seat support across both legs with 2-1/2" screws.
Build two with the support on the RIGHT and two on the LEFT. The plan bolds this because someone always builds four identical: each bench needs one of each hand.
Mark the seat boards 2" from each end (the overhang past the legs), then screw three boards per bench to a left and a right leg assembly, 1/4" gaps, glue and 2-1/2" screws. Square each bench by matching diagonals before the final screws.
Screw three tabletop boards across a pair of 17" 2x6 tabletop supports, same 1/4" gaps and 2" end overhangs as the seats. Drill a 1/2" hole in each support's lower end to match the back legs' pivot holes — each half will bolt between its bench's back legs.
Line up each tabletop half's support holes with the back legs' pivot holes, thread the 4" bolts through with washers, and snug the nuts — snug, not crushed; this joint rotates.
Rotate the top flat, clamp it, and lay the level across perpendicular to the boards. Level? Drill a second 1/2" hole through leg and support together and drop in a pin bolt. Both sides. Those in-place holes are why the tabletop will sit flat forever.
Pull the pins and rotate each top up into a backrest. SIT IN THE BENCH and adjust the angle until it's genuinely comfortable — this is a decision your back makes, not the plan. Clamp, drill the third hole through leg and support, and pin it.
Converting is now a ten-second job: pull two pins per bench, rotate, re-pin.
Screw the 41" bottom back support across the back legs, 6" up from the leg bases, two screws per end — it keeps the legs from splaying under load.
Sand hard (hands grip these edges every conversion), finish exterior-grade, and label the pin holes discreetly if houseguests will be doing the converting. Building longer? The source shows an 8-foot version: full-length boards, a third center leg assembly, and an added back brace.
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