How Much Wood Stain Do I Need?
Quick Answer
Most wood stains cover 8-14 m² per litre per coat
Based on: smooth, sanded timber. A dining table needs about half a litre for two coats; 10 m² of softwood needs about 2.25 litres. Rough or porous surfaces take more.
Coverage Per Litre by Finish Type
| Finish | m² per litre (per coat) | Note |
|---|---|---|
| Gel stain | 14-20 | Wiped on as a thin surface film |
| Water-based stain | 10-14 | Recoat in ~2 hours |
| Oil-based stain | 8-12 | Recoat in 6-8 hours |
| Hard wax oil | ~24 | Very thin coats |
| Linseed oil | ~18 | Multiple coats typical |
| Danish oil | ~14 | Usually 3 coats |
| Tung oil | ~12 | Slow curing |
| Polyurethane varnish (water-based) | ~14 | Usually 3 coats |
| Polyurethane varnish (oil-based) | ~12 | Usually 3 coats |
| Floor varnish | ~11 | Floors need 3-4 coats |
| Yacht varnish | ~10 | Exterior, flexible film |
| Wood preserver | ~5-6 | Applied liberally, 2-3 coats |
Typical figures for smooth, sanded timber. The spread rate printed on your tin always takes priority: enter it in the calculator’s override field for the most accurate quantity.
Worked Example: a Dining Table
- Table top 1,800 × 900mm = 1.62 m²
- Edges, legs and rails add roughly another 0.9 m², call it 2.5 m² in total
- First coat at a typical oil-based rate of 10 m²/L: 2.5 ÷ 10 = 0.25 litres
- Second coat uses about 20% less (the first coat has sealed the surface): 0.2 litres
- Total: about 0.45 litres, so half a litre covers a table comfortably
Worked Example: 10 m² of Softwood
Softwood such as pine soaks up more stain, dropping coverage by around 20% to roughly 8 m²/L. For 10 m² of cladding or panelling: first coat 1.25 litres, second coat about 1 litre, so 2.25 litres in total. Buy 2.5 litres.
Tips for Estimating
- Two coats is standard. The first penetrates, the second evens the colour. Very porous softwood may need a third; dense hardwood sometimes needs only one
- Surface matters: rough-sawn, unsealed or end-grain timber drinks stain; sealed or planed hardwood covers furthest
- MDF stains unevenly: seal it first, then use a gel stain
- Drying between coats: water-based ~2 hours, oil-based 6-8 hours, gel 8-24 hours; allow longer in cold or humid conditions
- Varnish and oil quantities follow the same area maths with their own rates: use the varnish coverage calculator or the oil finish calculator
What About Wood Preserver?
Preservers are applied more liberally than decorative stains. Leading UK products quote around 5-6 m² per litre and recommend 2-3 coats, so each coat on 10 m² of fence or shed takes just under 2 litres, about 4-6 litres for a full treatment. Treat end grain generously; it is where rot starts. If you already know your tin’s spread rate, the wood stain calculator works from any rate you enter, with waste allowance and cost built in.