CC/REV to GPM Calculator

Convert pump displacement (cc/rev) to flow rate (GPM) for hydraulic systems. Calculate flow with RPM and volumetric efficiency.

Hydraulic Flow Calculator:

Calculate hydraulic pump flow rate from displacement and speed. Essential for pump sizing, system design, and troubleshooting.

Flow Rate Converter

Mode

Pump displacement per revolution

Revolutions per minute

50% 75% 100%

Calculation Results

Enter displacement and RPM

then click "Calculate" for flow rate

CC/REV to GPM Converter

If you work with hydraulic systems, you've probably seen pump ratings in cc/rev. But when it comes to actual flow output, what matters is GPM — gallons per minute. The two are related, but you need one more piece of the puzzle: how fast the pump spins.

The Conversion Formula

To get from cc/rev to GPM, you multiply displacement by RPM, then convert the volume. Here's the formula:

GPM Formula
GPM = (cc/rev × RPM) ÷ 3785.41
1 US gallon = 3785.41 cubic centimeters

Let's say you have a 30 cc/rev pump running at 1500 RPM:

Example:
GPM = (30 × 1500) ÷ 3785.41 = 11.89 GPM

Accounting for Efficiency

Real pumps aren't perfect. Some fluid slips back internally, especially as the pump wears. That's where volumetric efficiency comes in — usually 85% to 95% for a healthy pump.

With Efficiency
GPM = (cc/rev × RPM × Efficiency) ÷ 3785.41
Use decimal form: 90% = 0.90

CC/REV to GPM Conversion Table

Here's a quick reference table showing common hydraulic pump configurations:

CC/REV RPM Efficiency GPM LPM
10 1000 90% 2.38 9.00
15 1200 90% 4.27 16.20
20 1500 95% 7.52 28.50
25 1800 90% 10.69 40.50
30 1500 90% 10.69 40.50
35 1800 85% 14.21 53.82
40 2000 90% 19.03 72.00
45 1750 92% 19.15 72.45
50 1500 90% 17.82 67.50
55 1800 88% 23.06 87.35
60 2000 90% 28.55 108.00
65 1450 85% 21.18 80.21
70 1800 90% 29.93 113.40
80 1500 92% 29.21 110.64
90 1750 88% 36.58 138.60
100 1800 90% 42.77 162.00
110 1500 85% 37.12 140.58
120 2000 90% 57.09 216.00
150 1800 88% 62.96 238.32
200 1500 90% 71.29 270.00
250 1200 85% 67.21 254.52
Practical Tip:

When sizing hydraulic pumps, always include a safety margin of 10-15% above calculated flow. Also, remember that efficiency drops as the pump wears — a pump that started at 95% might run at 85% after years of service.