🔧 Quick Engineering Tools

Fast-access calculators and conversion tools for everyday structural engineering tasks.

⇄ Unit Converter

Convert between length, force, moment, pressure, mass and more.

📋 Common Conversions Quick Reference

Frequently used engineering conversion factors at a glance.

From	To	Factor	Notes
1 kN	0.1019 tf	÷ 9.80665	Force
1 kN/m²	0.1020 tf/m²	÷ 9.80665	Pressure
1 MPa	10.197 kgf/cm²	÷ 0.0980665	Stress
1 kip	4.448 kN	× 4.448	Force
1 kip·ft	1.356 kN·m	× 1.356	Moment
1 psi	6.895 kPa	× 6.895	Pressure
1 ksi	6.895 MPa	× 6.895	Stress
1 ft	304.8 mm	× 304.8	Length
1 in	25.4 mm	× 25.4	Length
1 m	3.281 ft	× 3.281	Length
1 in⁴	416,231 mm⁴	× 416,231	2nd Moment
1 in³	16,387 mm³	× 16,387	Section Modulus
1 t	1,000 kg	× 1,000	Mass
1 short ton	0.9072 t	× 0.9072	Mass

⚖️ Weight Calculator

Calculate self-weight of steel sections, plates, concrete members and rebar.

Section Type

Designation

Length (m)

—

Section area looked up from SteelSections database. Density = 7,850 kg/m³.

Length (m)

Width (m)

Thickness (mm)

—

Length (m)

Width (m)

Depth (m)

—

Reinforced concrete density = 2,400 kg/m³.

Diameter (mm)

Length per bar (m)

Count

—

Using density = 7,850 kg/m³ and circular cross-section.

📐 Section Properties Calculator

Compute A, I_xx, Z_xx, r_xx for common cross-section shapes. All dimensions in mm.

b — Width (mm)

d — Depth (mm)

d — Diameter (mm)

B — Width (mm)

D — Depth (mm)

t — Thickness (mm)

D — Outer Dia (mm)

t — Thickness (mm)

bf — Flange width (mm)

tf — Flange thk (mm)

hw — Web height (mm)

tw — Web thk (mm)

bf — Flange width (mm)

tf — Flange thk (mm)

hw — Web height (mm)

tw — Web thk (mm)

b — Horizontal leg (mm)

d — Vertical leg (mm)

t — Thickness (mm)

📊 Load Combinations

Generate ULS and SLS design combinations per Eurocode EN 1990 or ACI 318.

G_k — Dead / Permanent (kN/m or kN/m²)

Q_k — Imposed / Live (kN/m or kN/m²)

W_k — Wind (kN/m or kN/m²)

S_k — Snow (kN/m or kN/m²)

💨 Wind Load Calculator (EC1)

Basic wind pressure and net design pressure per EN 1991-1-4.

Basic Wind Speed v_b (m/s)

Reference Height z (m)

Terrain Category

Structure Type

C_pe — External Pressure Coeff.

C_pi — Internal Pressure Coeff.

Air Density ρ (kg/m³)

🗺 UK Wind Speed Zones (BS EN 1991-1-4 NA)

Zone	Region	vb (m/s)
Zone 1	SE England	21.5
Zone 2	Central / E England	23.5
Zone 3	N England / E Scotland	26.0
Zone 4	W Scotland / Wales	30.0
Zone 5	Exposed coastal / W Isles	33.0

Based on EN 1991-1-4. w_e = q_b × c_e × (c_pe + c_pi).