Porotherm calculator
Porotherm is Wienerberger's tongue-and-groove hollow clay masonry range, widely used in Hungarian housing. Load-bearing Porotherm 30, 38 and 44 units all need 16 bricks per m², but Porotherm 25 N+F needs only 10.7 pcs. The Porotherm table below and free calculator give you quantities, pallets and estimated costs in minutes.
The calculator opens with Porotherm 30 N+F data prefilled:
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| Type | Dimensions (mm) | pcs/m² | pcs/pallet | Unit weight | Use |
|---|---|---|---|---|---|
| Porotherm 30 N+F | 300×250×238 | 16 | 80 | ~13.4 kg (Classic) / 12 kg (neo) | Load-bearing wall |
| Porotherm 38 N+F | 380×250×238 | 16 | 60 | ~17 kg | Load-bearing wall |
| Porotherm 44 X-therm | 440×250×238 | 16 | 50 | ~19.4 kg | Load-bearing wall, improved insulation |
| Porotherm 25 N+F | 250×375×238 | 10,7 | 60 | ~16.7 kg (Classic) / 15 kg (neo) | Main wall, internal load-bearing wall |
| Porotherm 10 N+F | 100×500×238 | 8 | 96 (ground: 100) | ~9.8 kg (Classic) / 8.3 kg (neo) | Partition wall |
The first dimension is wall thickness (thickness × length × height). Classic Porotherm 44 N+F was discontinued and replaced by 44 X-therm. Sources: Wienerberger data sheets and 2026 price list; check the actual product sheet before ordering. More masonry products: brick dimension table.
Common mistake: Porotherm 25 N+F is not 16 pcs/m²!
Using the familiar 16 pcs/m² figure for Porotherm 25 N+F would cause about 50% over-ordering . The 25 unit is not 250 mm, but 375 mm long: one unit including mortar joints covers 0.375 × 0.25 = 0.09375 m², so per m²: 1 / 0.09375 ≈ 10.7 pcs are needed. A 60-unit pallet therefore covers about 5.6 m², not 3.75.
What does N+F (tongue and groove) mean?
N+F means tongue and groove (tongue and groove): grooves and ribs on the vertical sides interlock during laying. The vertical joints need no mortar, which is applied only to the horizontal bed, making construction faster and reducing mortar use compared with traditional solid or block bricks. Ground Profi/Rapid products also use thin-bed mortar or adhesive foam in the horizontal joint.
Example: Porotherm 30 for one wall
Take a 10 m long, 2.8 m high Porotherm 30 N+F wall with a 150×120 cm window:
- Wall area: 10 × 2.8 = 28 m²
- Window deduction: 28 − 1.8 = 26.2 m² net area
- Brick requirement: 26.2 × 16 = 419.2 pcs
- With 10% reserve (breakage, cutting): 462 pcs
- Pallet requirement (80/pallet): 6 pallets
With several walls, doors and windows, manual calculations become complex. The Calculator handles walls, deducts openings and calculates pallets and net/gross costs. For a whole-house estimate, see: how many bricks does a house need?
Porotherm questions
How many Porotherm 30 units for 1 m²?
According to manufacturer data 16 pcs/m². The unit is 250 mm long and 238 mm high, covering 250×250 mm of wall with the bed joint: 4×4 units make 1 m². A pallet of 80 units covers 5 m².
What's the difference between Porotherm 30 and 38?
Both are load-bearing units requiring 16 pcs/m². The 38 N+F makes a 38 cm rather than 30 cm wall, weighs about 17 kg (30 Classic about 13.4 kg), and has 60 rather than 80 units per pallet. The thicker wall insulates better but takes more floor space.
How many Porotherm bricks on a pallet?
By type: 30 N+F: 80, 38 N+F: 60, 44 X-therm: 50, 25 N+F: 60, 10 N+F: 96 (ground Profi/Rapid: 100). Details: how many bricks per pallet?
What does X-therm mean in Porotherm 44?
X-therm is Wienerberger's enhanced-insulation generation. The manufacturer states that its ribbed cavity layout improves insulation by up to 50% over traditional hollow clay units, so 44 X-therm walls may meet energy requirements without extra external insulation. Classic 44 N+F was discontinued and replaced by 44 X-therm.
Related guides
Want to plan the wall layout too?
The 3D wall and room planner position walls, doors and windows, then calculate quantities using the same dimensions. You can also edit your plan on a separate page in a larger view.