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Use our free Orifice Flow Calculator to find flow rate instantly. Simple, accurate, and easy to use for fluid mechanics, tanks, and pipe systems.
Ever wondered how fast water leaves a tank through a small hole? That’s what our Orifice Flow Calculator helps you find. It’s a simple tool made for students, engineers, and anyone who works with fluid systems. You don’t need complex formulas or a physics degree this calculator does it all for you.
We designed this calculator so you can easily estimate the flow rate of liquid through an orifice in just seconds. Let’s dive in and see how it works.
An orifice is just a hole or cutout placed at the end of a tank or inside a pipe. When fluid passes through it, the pressure drops and the speed changes. This drop in pressure helps control the flow or even measure it.
You’ll find orifices in everyday systems from water tanks and pumps to hydraulic setups and spillways. They’re everywhere fluid needs control or measurement.
When water flows through a hole, it speeds up due to gravity. The flow rate depends on the size of the hole, the height of water above it, and how smooth the flow is.
In simple terms:
A bigger hole = faster flow.
More water height = higher pressure = faster discharge.
That’s why the orifice equation is so useful. It connects all these factors into one easy formula.
The orifice flow rate (Q) is calculated using this formula:
Q = Cd × A × √(2 × g × H)
Where:
This simple equation helps find how much fluid passes through the hole every second.
Let’s say you’ve got a tank with a 50 mm orifice and a 200 mm water height. The coefficient of discharge is 0.8.
Step 1: Convert values to meters
Diameter = 0.05 m
Height = 0.2 m
Step 2: Calculate area
A = π × (0.05 / 2)² = 0.0019635 m²
Step 3: Apply the formula
Q = 0.8 × 0.0019635 × √(2 × 9.81 × 0.2)
Q = 0.0031 m³/s
That’s the same as 3.1 liters per second. Pretty quick for a small opening!
It’s super simple.
The calculator instantly gives you the flow rate in m³/s, along with conversions to L/s, L/min, m³/h, ft³/s, and gal/min.
It even adjusts units automatically so no need to do manual conversions.
This tool saves time and avoids errors. Manual calculation can be tricky and easy to mess up with unit conversions. Our Orifice Flow Calculator ensures precision while keeping things fast and clear.
Whether you’re working on a hydraulic design, testing tank discharge, or learning fluid mechanics, this tool gives instant results that are accurate and reliable.
The Orifice Flow Calculator is a must-have for anyone dealing with fluid flow problems. It’s accurate, simple, and built for real-world use. You’ll love how quick it makes finding the discharge through an orifice.
No complex setup. No confusing math. Just input your data and get results.
Try it today and see how easy it is to calculate orifice flow rate in seconds!
An orifice is a hole or opening in a pipe or tank that allows liquid to flow through. It’s used to control or measure the flow rate.
It’s the volume of liquid passing through an orifice per second.
Use the formula:
Q = Cd × A × √(2 × g × H)
The diameter of the orifice, the water height (head), gravity, and the discharge coefficient.
For most smooth orifices, Cd ranges between 0.6 and 0.8.