What Janka hardness actually means
The Janka hardness test measures the force needed to press a small steel ball halfway into a piece of wood. The result — the Janka rating — tells you how well a species resists denting and surface wear. The higher the number, the harder and more dent-resistant the timber.
It is the standard way to compare flooring species, and it is genuinely useful: a floor in a busy hallway with kids, pets and chairs will show dents faster in a soft timber than a hard one. But hardness is only one part of the picture.
Why hardness isn't everything
- Dents vs scratches are different. A high Janka number resists denting from dropped objects and heavy point loads. Visible scratches, though, come mostly from the finish on top of the wood — a good modern topcoat protects a softer species well.
- Grain hides wear. A busy, open grain disguises fine scratches and dings far better than a smooth, plain face, so a slightly softer species can look better for longer.
- Stability matters too. How much a species swells and shrinks with humidity affects gapping and cupping — a concern hardness alone doesn't capture.
- Very hard can mean harder to work. Dense species are tougher to sand, nail and stain evenly.
So read Janka as a guide to dent resistance, then weigh it against colour, grain, stability, stainability and budget rather than chasing the biggest number.
Janka ratings for common species
Approximate, rounded Janka values for popular flooring timbers. Treat them as a comparison guide — published figures vary a little by source and by individual board.
| Species | Janka (approx.) | Character |
|---|---|---|
| American walnut | ~1010 | Soft, deep brown, refined |
| Teak | ~1155 | Oily, golden, very stable |
| Red oak | ~1290 | Warm, open grain, stains well |
| Ash | ~1320 | Pale, oak-like grain |
| White oak / European oak | ~1360 | Cool tone, tight grain, water-resistant |
| Hard maple | ~1450 | Very pale, smooth, dense |
| Hickory | ~1820 | Hardest common temperate species, rustic |
| Merbau | ~1925 | Dense tropical, reddish-brown |
For context, many Australian hardwoods such as spotted gum, blackbutt and ironbark sit at or above the merbau end of this scale, while softwoods like pine fall well below walnut.
How to choose a species
A good choice balances six things rather than optimising any single one:
- Hardness for the traffic. Busy households, pets and entryways favour harder species (oak and up). Quiet rooms can carry a softer, more characterful timber like walnut.
- Colour & grain. Decide the look first — pale and minimal (maple, ash, white oak), warm and traditional (red oak), dark and refined (walnut), or rustic and busy (hickory). Grain also hides wear.
- Dimensional stability. Some species move more with humidity. Quarter-sawn boards and naturally stable species (oak, teak) gap and cup less in changeable climates.
- Can it be stained? If you want a specific colour, choose an open-grained species that takes stain evenly (oak, ash) rather than a blotch-prone one (maple).
- Budget. Widely grown species (oak) cost less than slow-growing or imported ones (walnut, tropicals). Width and grade affect price as much as species.
- Sustainability. Look for credible certification (such as FSC or PEFC) and favour locally grown timber where you can — it cuts transport impact and usually means better availability of matching boards.
Red oak vs white oak
This is the single most-asked species question, because oak dominates hardwood flooring and the two types look similar at a glance but behave differently.
Colour & grain
Red oak is warmer, with pink-to-russet undertones and a strong, open, wavy grain that reads as busy and traditional. White oak is cooler, with grey-brown to olive undertones and a tighter, straighter grain. White oak's calmer face is why it dominates current modern, Scandinavian and wire-brushed looks; red oak's busier grain suits classic interiors and hides wear well.
Water resistance
White oak's pores are plugged with a substance called tyloses, making it closed-grained and more water-resistant — historically the reason it was used for barrels and boats. Red oak is open-pored and absorbs moisture more readily. For kitchens and damp-prone rooms, white oak has the edge, though finish quality matters more than species either way.
Graining & staining
Both stain well, but they shift differently: red oak's pink base can fight cool grey stains and tends to read warmer, while white oak's neutral base takes greys, whites and natural tones more truly — another reason it suits contemporary palettes. White oak is also slightly harder (~1360 vs ~1290 Janka). Red oak is frequently more affordable and more widely stocked.
Quick rule: want a warm, traditional, budget-friendly floor that hides wear? Red oak. Want a cool, modern look, grey or natural stains, and a touch more water resistance? White oak.
Maple, walnut, ash & hickory
Hard maple (~1450 Janka)
Very pale, almost creamy, with a fine smooth grain and few markings — a clean, contemporary look. It is hard and durable, but its density and tight grain make it prone to blotching when stained; it is usually left natural or finished with a tinted coat rather than a penetrating stain. Best where you want light and minimal.
American walnut (~1010 Janka)
The premium dark hardwood — rich chocolate-brown with a smooth, elegant grain. It is genuinely softer than oak, so it dents more easily and suits lower-traffic, formal spaces. Its natural depth of colour means it rarely needs staining. Often the most expensive mainstream species.
Ash (~1320 Janka)
Pale and blond like maple but with an open, oak-like grain, so it takes stain far more evenly than maple. Hard, springy and a good-value alternative to oak when you want a light floor that can still be coloured. Availability varies by region.
Hickory (~1820 Janka)
The hardest common temperate species — excellent for high-traffic homes and active families. It has a dramatic, rustic grain with strong colour variation between pale sapwood and darker heartwood, which hides wear superbly but is a bold visual choice. Its hardness makes it harder to sand and finish.
Species around the world
Hardwood flooring is a global craft, and every region has its own favourites shaped by what grows locally:
- North America — red and white oak above all, with maple, walnut, ash, hickory and cherry.
- Europe — European oak is the default, alongside ash and beech; reclaimed and engineered oak are especially popular.
- Australia — dense native eucalypts dominate: blackbutt, spotted gum, jarrah, brushbox and Tasmanian oak, prized for hardness and warm tones.
- New Zealand — native rimu and matai feature in older and restored homes, with oak common in new builds.
- South-East Asia — teak and merbau lead: oily, dense, stable tropical hardwoods well suited to humid climates.
Wherever you are, the same principles apply — match hardness to traffic, grain and colour to taste, and finish to species. A locally grown timber is usually easier to source, match and repair than an imported one.
Finishing considerations by species
Species doesn't just change how a floor looks — it changes how it should be finished.
High-tannin species (oak, chestnut)
Oak is rich in tannins, which can react with moisture in a water-based finish and pull a yellow or pinkish cast into the first coat. A suitable primer or sealer manages this, locking down the tannins so the topcoats stay clear and the colour stays true. Choosing a finish →
Oily tropical species (teak, merbau)
These timbers carry natural oils that can stop a finish bonding, causing slow drying or adhesion failure. The fix is the right preparation: wipe the surface to remove surface oils just before coating, and use a product and primer rated for oily species. Penetrating stains struggle on these woods because the oil resists absorption.
Dense species (hickory, maple, eucalypts)
Hard, dense timbers burnish if sanded too aggressively or with too-coarse a grit, which can stop stain and finish penetrating evenly. Finish the sanding sequence with finer abrasives to leave an even, open surface, and test stain on an offcut first — dense, tight-grained species are the most likely to blotch.
Whatever the species, the durability you actually feel underfoot comes from the topcoat. A quality finish protects a softer timber well, and the wrong prep can let down the hardest one. Oil vs polyurethane →
Frequently asked questions
What is the Janka hardness scale?
The Janka hardness test measures the force needed to embed a small steel ball halfway into a piece of wood. The result, the Janka rating, indicates how resistant a species is to denting and wear: the higher the number, the harder and more dent-resistant the timber. It is the standard way to compare flooring species, but it only measures surface hardness, not overall suitability.
Is red oak or white oak better for flooring?
Neither is simply better — they suit different goals. White oak is slightly harder (around 1360 Janka vs about 1290 for red oak), has a cooler grey-brown tone, a tighter closed grain and better water resistance, which is why it suits wire-brushed and modern looks. Red oak is a touch softer, warmer and pinker with a stronger open grain that hides wear and takes stain readily. Red oak is often more affordable; white oak is the current design favourite.
What is the hardest wood for floors?
Among common flooring timbers, dense tropical and eucalyptus species are hardest — merbau is around 1925 Janka and many Australian hardwoods such as spotted gum and ironbark rate even higher. Among mainstream temperate species, hickory (about 1820) is the hardest, well above oak and maple. Extremely hard exotics exist but are specialty products.
Does a harder wood floor scratch less?
Harder wood resists denting from impacts and point loads better, but scratch resistance comes mostly from the finish, not the timber. A well-applied modern topcoat protects the surface regardless of species, and a busy grain pattern hides fine scratches better than a smooth one. Hardness helps with dents; finish and grain matter more for visible scratches.
What is the most popular hardwood flooring species?
Oak is by far the most popular hardwood flooring species worldwide. In North America red and white oak dominate; across Europe European oak is the default choice. Oak is popular because it is widely available, moderately priced, hard enough for everyday traffic, dimensionally stable, and takes stain and finish predictably.
Can any wood species be stained?
Almost any species can be stained, but they do not all take stain equally. Open-grained woods like oak and ash absorb stain readily and evenly, while dense, tight-grained species like maple can blotch and often need a conditioner or a tinted finish instead. Very oily tropical species resist penetrating stains. When colour change matters, choose a species known to stain well or test on an offcut first.