# Calculations for floatation of a pontoon

• plumbwhite
In summary, the amount of floatation required to hold up a pontoon weighing approximately 2 tonnes can be calculated by subtracting the weight of the pontoons from the displacement of the pontoons. For example, a 55 gallon drum can displace around 440 pounds in fresh water, and subtracting the weight of the actual barrel (22 lbs for a plastic barrel) will give the carrying capacity of the pontoon. However, whether the weight of the pontoons should be included in the calculation depends on the purpose of the calculation - if for classroom use, include the weight, but if for practical use on the shore, the weight may be excluded.

#### plumbwhite

I am looking for a calculation to work out the amount of floatation that would be required to hold up a pontoon weighing apptox 2 tonne?

The pontoons will displace 2 tonnes of water. It's all just geometry and simple math from there.

Displacement of the pontoons(floats) minus the weight of the pontoons will give you the actual carrying capacity.
A 55 gallon drum will displace approximately 440 pounds in fresh water-subtract the actual weight (22 lbs for a plastic barrel) and off you go!
Hope this helps.

Pontoon

BillBLack said:
Displacement of the pontoons(floats) minus the weight of the pontoons will give you the actual carrying capacity.
A 55 gallon drum will displace approximately 440 pounds in fresh water-subtract the actual weight (22 lbs for a plastic barrel) and off you go!
Hope this helps.

Thanks very much for your help I am only a plumber

BillBLack said:
Displacement of the pontoons(floats) minus the weight of the pontoons will give you the actual carrying capacity.
A 55 gallon drum will displace approximately 440 pounds in fresh water-subtract the actual weight (22 lbs for a plastic barrel) and off you go!
Hope this helps.
Well yeah, but the pontoons are still part of the structure you're floating, so why subtract them out?.

(I guess it depends on whether you're doing the calc in the classroom or on the shore. In the classroom, you'd calc the entire weight of the device, which would include the pontoon. On the shore, you're really interested in floating the device only - the pontoon is merely the solution, thus its weight would be a side-effect. So OK, yeah.)

## 1. What is the formula for calculating the floatation of a pontoon?

The formula for calculating the floatation of a pontoon is: F = (D - W) / V, where F is the floatation force, D is the density of the water, W is the weight of the pontoon, and V is the volume of the pontoon.

## 2. How do I determine the density of the water for the calculation?

The density of water can vary depending on factors such as temperature and salinity. You can find the average density for your location by consulting a water density table or using a density calculator online.

## 3. What is the weight of the pontoon in the formula?

The weight of the pontoon is the total weight of the pontoon and any objects or materials on it, such as passengers and cargo.

## 4. How do I calculate the volume of the pontoon?

The volume of the pontoon can be calculated by multiplying the length, width, and height of the pontoon. If the pontoon is irregularly shaped, you can use the displacement method to determine its volume.

## 5. What is the significance of calculating floatation for a pontoon?

Calculating floatation for a pontoon is important for ensuring the safety and stability of the pontoon. It helps determine the weight capacity and maximum load that the pontoon can safely support without sinking or becoming unstable.