| Venturimeter | Orifice meter |
| Losses are very ow and hence, coefficient of discharge (Cc) is high. In general, Cd = 0.98. | Losses are high and hence, coefficient of discharge (Cd) is less. In general, Cd = 0.64 |
| Suitable for measurements of higher flow rates. | Not suitable for measurements of higher flow rates. |
| Cost of installation and replacement is more. | Cost of installation and replacement is less. |
| More space is required. | Less space is required. |
| They can be used to measure flow rates of all incompressible fluids (gases with low variations in pressure as well as liquids). | They are generally used to measure flow rates of liquids. |
| Here, the flow is accelerated gradually in converging section with subsequent gradual decrease in pressure. | Here, the entire pressure drop occurs instantly, when flow passes through orifice. |