Gear Ratio Calculator: Optimize Your Engine RPM & Speed (Free Tool) You are building a car. You are choosing a rear end gear. You want to know how engine RPM affects your speed. Too high a gear, and you lose acceleration. Too low a gear, and your engine screams on … Read more
Flow Rate Calculator: Calculate Volumetric & Mass Flow (Free Tool) You have a pipe. Water flows through it. How much water passes a point every second? That is the flow rate. Flow rate is critical for pumps, pipes, sprinklers, and industrial processes. Too low, and equipment does not work. Too … Read more
Horsepower Calculator: Calculate Engine Power & Torque (Free Tool) You have a car. You want to know its horsepower. Or you are building an engine. You need to estimate power. Horsepower measures how fast work is done. It is the standard unit for engines, motors, and machines. Today, I give … Read more
Reynolds Number Calculator: Predict Fluid Flow (Laminar or Turbulent) You have fluid flowing through a pipe. Is it smooth and orderly? Or chaotic and mixed? The answer affects pressure drop, heat transfer, and mixing. The Reynolds number tells you whether flow is laminar or turbulent. Today, I give you a … Read more
Static Pressure Calculator: Measure HVAC Duct & Fan Resistance (Free Tool) You have a fan. You have ducts. You turn on the fan. But air barely comes out of the vents. The problem is static pressure. Static pressure is the resistance to airflow in a duct system. Think of it … Read more
Air Changes Per Hour Calculator: Optimize Your Room Ventilation (Free Tool) You have a room. You need to know how often the air is replaced. Is it enough for a bathroom? A laboratory? A grow room? Air changes per hour (ACH) tells you how many times the entire volume of … Read more
Pressure Drop Calculator: Calculate Pipe Pressure Loss (Free Tool) You are designing a piping system. Water flows through a long pipe. By the time it reaches the end, the pressure is lower. How much lower? Pressure drop is the loss of pressure as fluid flows through a pipe. It happens … Read more
Chiller Load Calculator: Size Your Cooling System Correctly (Free Tool) You are designing a cooling system for a building. You need a chiller. But how big? Too small, and the space never cools down. Too large, and you waste money on equipment and energy. Chiller load is the amount of … Read more
Duct Size Calculator: Find the Right HVAC Duct Diameter (Free Tool) Duct Size Calculator Calculate the perfect duct size for your HVAC system. Get accurate results in seconds. Airflow (CFM): Typical range: 100-2000 CFM Air Velocity (FPM): Recommended: 700-900 FPM for supply, 500-700 FPM for return Calculate Duct Size Round … Read more
CFM Calculator: Calculate Airflow for HVAC, Fans & Ventilation (Free Tool) You are installing a new exhaust fan. You are sizing ductwork. You are designing a ventilation system. How much air do you need to move? Airflow is measured in CFM – Cubic Feet per Minute. Too little airflow, and … Read more
