Welcome to EngineeringHulk’s free Engineering Calculators — a growing collection of fast, accurate online tools for civil, mechanical, electrical and electronics engineering students and professionals. Every calculator works instantly in your browser, with the formula, a worked example and FAQs on each page.
⚡ Electrical & Electronics Calculators
- Ohm’s Law Calculator — voltage, current, resistance & power (V = IR)
- Voltage Divider Calculator — Vout = Vin × R2/(R1+R2)
- Electrical Power Calculator — P = VI = I²R = V²/R
- LED Resistor Calculator — series resistor for an LED
- Resistor Color Code Calculator — 4-band colour to resistance
- Capacitive Reactance Calculator — Xc = 1/(2πfC)
🏗️ Civil Engineering Calculators
- Concrete Volume Calculator — cement, sand & aggregate (M15/M20/M25)
- Steel Bar Weight Calculator — unit weight of steel (D²/162)
- Brick Calculator — number of bricks for a wall
- Cement, Sand & Aggregate Calculator — materials from concrete volume
⚙️ Mechanical Engineering Calculators
- Cutting Speed & RPM Calculator — machining (V = πDN/1000)
- Torque Calculator — T = Force × Radius
- Gear Ratio Calculator — ratio & output speed
- Thermal Expansion Calculator — ΔL = αLΔT
- Beam Deflection Calculator — simply supported, central load
- Stress & Strain Calculator — stress, strain & Young’s modulus
💻 Computer Science & General Calculators
- Decimal to Binary, Octal & Hex Converter
- IP Subnet Calculator — network, broadcast, mask & hosts (CIDR)
- Percentage Calculator — find X% of a number
- Length Unit Converter — m, cm, mm, km, inch, ft, mile
More calculators are added regularly — bookmark this page.