Langue
Unités
Formules de Construction — Référence Complète
Référence rapide de toutes les formules utilisées par les 8 calculateurs de ce site.
Hazen-Williams — Pipe / Tuyaux / Rohre
Q = 0.2785 × C × d^2.63 × S^0.54
PVC: C=150 · Copper/Cuivre/Kupfer Type L: C=130 · PEX: C=140
PVC: C=150 · Copper/Cuivre/Kupfer Type L: C=130 · PEX: C=140
Concrete / Béton / Beton
V (cu ft) = length × width × depth
Bags 60lb = V ÷ 0.45 · Bags 80lb = V ÷ 0.60
1 cu yd = 27 cu ft = 0.765 m³ · Add 8–10% waste
Bags 60lb = V ÷ 0.45 · Bags 80lb = V ÷ 0.60
1 cu yd = 27 cu ft = 0.765 m³ · Add 8–10% waste
Electrical / Électrique / Elektrik (NEC 125%)
Single phase: I = P ÷ V · Three phase: I = P ÷ (V × √3)
Breaker = I × 1.25 → next standard: 15, 20, 30, 40, 50A
12 AWG ≈ 4mm² · 10 AWG ≈ 6mm² · 8 AWG ≈ 10mm²
Breaker = I × 1.25 → next standard: 15, 20, 30, 40, 50A
12 AWG ≈ 4mm² · 10 AWG ≈ 6mm² · 8 AWG ≈ 10mm²
Roof Pitch / Pente / Dachneigung
Degrees = arctan(rise ÷ run)
Rafter factor = √(1 + (rise/run)²)
6:12 = 26.6° · Factor = 1.118 · True area = plan area × factor
Rafter factor = √(1 + (rise/run)²)
6:12 = 26.6° · Factor = 1.118 · True area = plan area × factor
| Pitch | ° | % | Factor |
|---|---|---|---|
| 4:12 | 18.4° | 33% | 1.054 |
| 6:12 | 26.6° | 50% | 1.118 |
| 8:12 | 33.7° | 67% | 1.202 |
| 12:12 | 45.0° | 100% | 1.414 |
Tiles / Carrelage / Fliesen
Total tiles = (area ÷ tile area) × (1 + waste)
Straight: 10% · Diagonal: 15% · Herringbone: 20%
Grout: 2–4 kg/m²
Straight: 10% · Diagonal: 15% · Herringbone: 20%
Grout: 2–4 kg/m²
Paint / Peinture / Farbe
Wall area = 2 × (L + W) × height − doors − windows
Coverage: 10–12 m²/L smooth · 6–8 m²/L textured
Coverage: 10–12 m²/L smooth · 6–8 m²/L textured
Studs / Montants / Ständer
Count = ceil(length ÷ spacing) + 1
16" OC = load-bearing · 24" OC = partitions
16" OC = load-bearing · 24" OC = partitions