Engineering Calculator Suite - Free Online Tools

Gear Ratio Calculator

Calculate gear ratios, mechanical advantage, and speed relationships between driving and driven gears. Essential for mechanical design and power transmission systems.

Driving Gear Teeth:

Driven Gear Teeth:

Input Speed (RPM):

Pulley Calculator

Calculate mechanical advantage and force requirements for various pulley systems. Includes fixed, movable, and compound pulley configurations.

Pulley System Type:

Load Weight (lbs or N):

Number of Supporting Ropes:

Lever Calculator

Calculate forces and distances for all three classes of levers. Input any three values to find the fourth using the principle of moments. When all four values are provided, the calculator will verify equilibrium.

Lever Class:

Effort Force (N or lbs):

Load Force (N or lbs):

Effort Arm Length:

Load Arm Length:

Spring Calculator

Calculate spring force, displacement, and spring constant using Hooke's Law (F = kx). Supports compression and extension springs. Enter any two values to find the third.

Spring Constant (k) [N/m or lbs/in]:

Displacement (x) [m or in]:

Force (F) [N or lbs]:

Simple Beam Calculator

Calculate maximum bending moment and deflection for simply supported beams with point loads or distributed loads.

Load Type:

Beam Length (L) [m or ft]:

Applied Load [N or lbs]:

Moment of Inertia (I) [m⁴ or in⁴]:

Elastic Modulus (E) [Pa or psi]:

Stress Calculator

Calculate tensile, compressive, and shear stress. Input force and cross-sectional area to determine material stress levels.

Stress Type:

Applied Force [N or lbs]:

Cross-sectional Area [m² or in²]:

Torque Calculator

Calculate torque using the formula T = F × r × sin(θ). Input force and lever arm distance to determine rotational force.

Applied Force [N or lbs]:

Lever Arm Distance [m or ft]:

Angle from Perpendicular [degrees]:

RPM Calculator

Calculate rotational speed relationships, gear ratios, and convert between different speed units. Perfect for motor and transmission calculations.

Input Speed [RPM]:

Gear Ratio (Input:Output):

Wheel Diameter [in or cm]:

Horsepower Calculator

Calculate horsepower from torque and RPM, or convert between different power units. Essential for engine and motor specifications.

Torque [lb-ft or N-m]:

RPM:

Torque Unit:

Efficiency Calculator

Calculate mechanical, electrical, or thermal efficiency. Input power values to determine system efficiency percentages.

Input Power [W, HP, BTU/hr]:

Output Power [W, HP, BTU/hr]:

Power Loss [W, HP, BTU/hr] (optional):

Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law and power formulas. Input any two values to find the others.

Voltage (V):

Current (A):

Resistance (Ω):

Power (W):

Capacitor Calculator

Calculate capacitance in series and parallel configurations, time constants, and reactance. Essential for AC circuit analysis.

Configuration:

Capacitor 1 [µF or pF]:

Capacitor 2 [µF or pF]:

Frequency [Hz] (for reactance):

Resistance [Ω] (for time constant):

Resistor Color Code Calculator

Decode resistor color bands to determine resistance value and tolerance. Supports 4-band and 5-band resistors.

Number of Bands:

1st Band (1st Digit):

2nd Band (2nd Digit):

3rd Band (3rd Digit):

Multiplier Band:

Tolerance Band:

Antenna Length Calculator

Calculate optimal antenna lengths for various frequencies and antenna types. Includes dipole, monopole, and quarter-wave calculations.

Antenna Type:

Frequency [MHz]:

Velocity Factor (0.66-0.98):

Signal Strength Calculator

Convert between different signal strength units (dBm, watts, volts) and calculate path loss for RF communications.

Signal Power [dBm]:

Signal Power [Watts]:

Distance [km or miles]:

Frequency [MHz]:

Distance Unit: