Engineering Tools
Engineering Calculators
Free calculators for Civil, Electrical, and Mechanical engineering — from concrete mix design to HVAC load, cable sizing to EMI.
Civil: 15 calculatorsElectrical: 51 calculatorsMechanical: 5 calculatorsGeneral: 5 calculators
Civil Engineering
15 calculators — click any card to expand
Quick Reference — Common Engineering Values
Concrete Densities
- M20 = 2400 kg/m³
- M25 = 2450 kg/m³
- PCC = 2200 kg/m³
- RCC = 2500 kg/m³
Steel Properties
- Density = 7850 kg/m³
- Fe415 fy = 415 MPa
- Fe500 fy = 500 MPa
- Modulus E = 2×10⁵ MPa
Electrical Standards
- LT Supply = 415 V (3-ph)
- HT Supply = 11 kV
- Max V-drop = 3%
- PF target ≥ 0.95
HVAC Thumb Rules
- 1 TR = 3.517 kW
- 1 TR ≈ 150 sq ft
- Fresh air = 10 CFM/person
- Office ACH = 4–6
Need a Detailed Project Estimate?
Use our CPWD Rate Estimator for itemized cost estimates, or contact our team for a site-specific quote.