Spike's Calculators

Open the tap full blast, place the container underneath the flow and time the amount of time it takes, in seconds, to fill the container.

**Example:** 5 gallon bucket takes 15 seconds to fill

5 gallons --- 15 seconds = 5 / 15 * 60 = 20 gallons per minute average flow rate

Alternately you can take a certain amount of time and then measure the amount of water in the container.

**Example:** 5-gallon container placed under the water flow (full blast) for 10 seconds, remove the container and then measure the amount of water in the bucket. If you are using a measuring cup you need to convert this to gallons. One cup = 0.0625 US Gallons. If in 10 seconds you have 48.5 cups of water you have 48.5 * 0.00625 = 3.03 US gallons of water in your container. Enter 3.03 under container size and 10 seconds in the time it takes to fill the container.

3.03 US gallons---10 seconds = 3.03 / 10 * 60 = 18.18 US Gallons per minute average flow rate

To get a more accurate result all other water sources in the house should be turned off.

- enter the size of your container (in US gallons)
- the time it takes to fill the container in (seconds)

- flow rate in US gallons per minute
- flow rate in US gallons per hour

- Capacity of a Round Cistern - Imperial measurements
- Capacity of a Round Cistern - Metric measurements
- Capacity of a Square or Rectangular Shaped Cistern - Imperial measurements
- Capacity of a Square or Rectangular Shaped Cistern - Metric measurements
- Collecting Rain Water from a Catchment Area/ Inch per Square Foot
- Rainfall per Unit Area, Inch per Acre
- Rainfall per Unit Area, Millimetres per Acre
- Rainfall per Unit Area, Millimetres per Hectare

- Garden Hose Flow Calculator
- Measuring the Water Flow from a Tap in Gallons per Minute
- Measuring the Water Flow from a Tap in Litres per Minute
- Water Application Rate for an Area

- Pressure Loss in Pipes from Friction
- Valves and Fittings 1/2" to 24" diameter, equivalent length calculation