Con calc: planks, furniture and the real cost of Construction

Enter your Construction level or look up your character, set a target, and the table shows how many of each piece of furniture you need, the planks that takes and the cost at today's plank prices. Pick the target first, then compare oak, teak and mahogany rows. In this skill the plank type sets the price per xp far more than the furniture does.

XP needed13,034,4310 to 13,034,431 xp

Levels to gain98Level 1 to 99

Cheapest per xp−5.6 gp/xpCrude wooden chair

Most xp each57 xpCrude wooden chair

Action	Level	XP each	Actions	Profit each	GP/XP	Total
Crude wooden chairCheapestChairs and benches · Assumes no nails bend; extra nails may be needed.	1	57	228,675	−322	−5.6	−73.6M
Wooden bookcaseStorage · Assumes no nails bend; extra nails may be needed.	4	115	113,343	−644	−5.6	−73M
Wooden chairChairs and benches · Assumes no nails bend; extra nails may be needed.	8	87	149,822	−483	−5.6	−72.4M
Wooden larderStorage · Assumes no nails bend; extra nails may be needed.	9	228	57,169	−1,288	−5.6	−73.6M
Wooden benchChairs and benches · Assumes no nails bend; extra nails may be needed.	10	115	113,343	−644	−5.6	−73M
Rocking chairChairs and benches · Assumes no nails bend; extra nails may be needed.	14	87	149,822	−483	−5.6	−72.4M
Oak chairChairs and benches	19	120	108,621	−1,008	−8.4	−109M
Oak benchChairs and benches	22	240	54,311	−2,016	−8.4	−109M
Oak dining tableTables	22	240	54,311	−2,016	−8.4	−109M
Oak armchairChairs and benches	26	180	72,414	−1,512	−8.4	−109M
Oak drawersStorage	27	120	108,621	−1,008	−8.4	−109M
Oak staircaseDoors and other · Built in a staircase space.	27	680	19,169	−7,200	−10.6	−138M
Oak bookcaseStorage	29	180	72,414	−1,512	−8.4	−109M
Carved oak benchChairs and benches	31	240	54,311	−2,016	−8.4	−109M
Carved oak tableTables	31	360	36,207	−3,024	−8.4	−109M
Oak kitchen tableTables	32	180	72,414	−1,512	−8.4	−109M
Oak workbenchDoors and other	32	300	43,449	−2,520	−8.4	−109M
Oak larderStorage · Built in the kitchen larder space.	33	480	27,156	−4,032	−8.4	−109M
Oak prize chestDoors and other	34	240	54,311	−2,016	−8.4	−109M
Teak armchairChairs and benches	35	180	72,414	−1,634	−9.1	−118M
Teak dining benchChairs and benches	38	360	36,207	−3,268	−9.1	−118M
Teak tableTables	38	360	36,207	−3,268	−9.1	−118M
Oak wardrobeStorage	39	180	72,414	−1,512	−8.4	−109M
Mahogany bookcaseStorage	40	420	31,035	−5,616	−13.4	−174M
Oak lecternDoors and other	40	60	217,241	−504	−8.4	−109M
Teak larderStorage	43	750	17,380	−7,334	−9.8	−127M
Carved teak benchChairs and benches	44	360	36,207	−3,268	−9.1	−118M
Teak prize chestDoors and other	44	660	19,750	−139K	−211	−2.75B
Carved teak tableTables	45	600	21,725	−6,498	−10.8	−141M
Mahogany armchairChairs and benches	50	280	46,552	−3,744	−13.4	−174M
Teak drawersStorage	51	180	72,414	−1,634	−9.1	−118M
Mahogany benchChairs and benches	52	560	23,276	−7,488	−13.4	−174M
Mahogany tableTables · Built in the dining room table space.	52	840	15,518	−11,232	−13.4	−174M
Teak kitchen tableTables	52	270	48,276	−2,451	−9.1	−118M
Mahogany prize chestDoors and other	54	860	15,157	−144K	−167	−2.18B
Teak eagle lecternDoors and other	57	180	72,414	−1,634	−9.1	−118M
Gilded benchChairs and benches	61	1,760	7,406	−552K	−313	−4.09B
Teak wardrobeStorage	63	270	48,276	−2,451	−9.1	−118M
Teak garden benchChairs and benches · Built in the superior garden seating space.	66	540	24,138	−4,902	−9.1	−118M
Mahogany eagle lecternDoors and other	67	580	22,474	−140K	−241	−3.14B
Opulent tableTables	72	3,100	4,205	−1.22M	−395	−5.15B
Oak dungeon doorDoors and other · Built at a dungeon door space.	74	600	21,725	−5,040	−8.4	−109M
Mahogany wardrobeStorage	75	420	31,035	−5,616	−13.4	−174M
Gnome benchChairs and benches · Built in the superior garden seating space.	77	840	15,518	−11,232	−13.4	−174M
Steel-plated dungeon doorDoors and other · Built at a dungeon door space.	84	800	16,294	−10,440	−13.1	−170M
Gilded wardrobeStorage	87	720	18,104	−142K	−197	−2.56B
Marble dungeon doorDoors and other · Built at a dungeon door space.	94	2,000	6,518	−1.34M	−668	−8.71B

Profit each is the value of what you make minus the materials, at current Grand Exchange mid prices and before the 2% GE tax. Negative numbers are a cost. Greyed rows need a higher level than you have.

What the construction calculator works out

Each row is one build: an oak larder, a mahogany table, a gnome bench. Cost is the planks (and any nails, cloth, steel bars or marble) at current prices, and since the furniture is removed again for the next build, nothing comes back. Every row is a cost, so gp per xp is the column to sort by. The bonus selector covers the carpenter's outfit, which adds 2.5% xp for the full set.

Construction is a members skill, so the members toggle has no effect on this table.

The standard fast route

Levels	Build	XP each	Planks each	Planks for the stretch
33 to 52	Oak larder	480	8 oak	1,760
52 to 77	Mahogany table	840	6 mahogany	9,660
77 to 99	Gnome bench	840	6 mahogany	82,566
66 to 74	Teak garden bench (cheaper)	540	6 teak	Alternative to tables
74 to 99	Oak dungeon door (cheaper)	600	10 oak	Alternative to benches

Plank counts assume you start at the beginning of each band and use the listed build all the way. The tool gives the exact total from your real xp.

Mahogany is the fastest wood and the most expensive per xp. Teak garden benches and oak dungeon doors cost noticeably less per xp at the price of some speed, which is why many players switch to them once the mahogany bill starts to hurt. Mahogany plank prices move with demand, so check the calculator again before you buy for a big goal rather than relying on last week's figure.

Mounted mythical capes

A mythical cape mounted in the quest hall's guild trophy space gives 370 xp for three teak planks. Removing it hands the cape back, so you can build it again and again and the planks are the only cost. It is slower than tables or benches but one of the cheapest options per xp in the skill. The build itself is level 47, but the cape comes from Dragon Slayer II, which needs 50 Construction to start, so in practice it opens at 50.

Servants and plank supply

How you get planks into your house decides your real xp per hour. A demon butler (50 Construction) fetches planks from the bank fastest, and a regular butler from 40 is the next best. Servants ask for wages after every eight trips; a servant's money bag (58) pays them for you. Plank Make on the Lunar spellbook (86 Magic, Dream Mentor) turns logs into planks without the sawmill and trains Magic too. The sawmill operator charges a fee per plank, so compare log and plank prices before converting your own.

Cheap and AFK: Mahogany Homes

Mahogany Homes contracts give less xp per hour but cost far less per xp, because each contract pays a bonus on top of the furniture and uses few planks. Expert contracts (70) give the best rates, and contract points buy the carpenter's outfit and a plank sack. The Mahogany Homes calculator works out contracts and planks for a goal.

Levels worth reaching

50 gets the demon butler and, with Dragon Slayer II, the mythical cape method. 72 builds the marble portal nexus, the first tier that packs several house teleports into one frame. It needs marble blocks, as do the fancy and ornate rejuvenation pools at 85 and 90. Beyond that, most players train towards the house upgrades they want for bossing, such as a better pool and a jewellery box. The full plan with early quests is in the Construction training guide.

Questions players ask

How many mahogany planks do I need for 99 Construction?

Using mahogany tables from 52 to 77 and gnome benches from 77 to 99 takes about 92,226 mahogany planks, since both builds use six planks for 840 xp. Add oak planks for the larders before 52. The calculator gives your exact total and the price at today's plank prices.

What is the cheapest way to train Construction?

Mahogany Homes contracts and mounted mythical capes are the cheapest per xp. Among standard builds, oak larders, teak garden benches and oak dungeon doors cost less than mahogany. Sort the calculator by gp per xp to see today's ranking, since plank prices move.

Does the carpenter's outfit help?

The full carpenter's outfit adds 2.5% xp, so you need about 2.5% fewer planks for the same goal. It comes from Mahogany Homes contract points. It saves money but not much time, so it pays off most for players who train through contracts anyway.

How many oak larders from 33 to 52 Construction?

Oak larders give 480 xp each, so 220 larders take you from the start of level 33 to 52. That is 1,760 oak planks. You need a kitchen in your house to build them.

Is the con calc accurate with a servant?

Yes for planks and cost: the servant changes your speed, not the xp or planks per build. Servant wages are separate from plank costs, so add them on top if you use a butler for a long goal.

By OSRS Math Team · 16 Oct 2026