View Full Version : How do I calculate the amount of sand needed?

04-12-11, 11:52 AM
I need to top up my arena with about 1 inch of sand. Does anyone have a fomula so I can would out how many square metres I will need to add 1 inch to a 60 x 20 arena? I am a complete maths nuffy. ;)

I will get it dumped next to the arena so we can determine where on the arena needs more or less. At least that way I can put it on gradually to avoid the possiblity of it being to heavy and having to drag some off. I figured that I will probably have a some left over for later use.

04-12-11, 12:15 PM
I think about 30 square meters.
An inch is 0.0254 of a meter, so 20x60x0.0254= 30.48

04-12-11, 12:46 PM
Ummm ... that would be 30 cubic metres :)

04-12-11, 12:49 PM
but she only wants an INCH thick layer not a metre layer. so it's 30 square metres an inch thick. i'd go with ren.

04-12-11, 12:58 PM
60 x 20m = 1200

1m/2.54cm = 39.3

1200/39.3 = 30.5?

Alternatively I think its 30m x 30m x 38mm thick to give a coverage of 25mm (approx).



04-12-11, 01:20 PM
Oh Renvers is right - but she has said square metres instead of cubic metres.

The area to be covered is 1200 square metres. Multiply that by .0254 of a metre (that's the one inch) equals 30.48 cubic metres.

That's how much sand KLB will need to cover her arena with one inch of sand.

Generally, a cubic metre is around one tonne.

04-12-11, 01:30 PM

Someone on another forum gave me a link to work out the volume required - 30 cubic metres or 45 tonne. That is a lot of sand (and money)!!!!!

I am thinking I might get 10 cubic metres and see how we go. There are sections of the arena that are okay so I am thinking I might start smaller and see what works. My farrier has a bobcat and does some routine maintainance on the arena for me so we can just dump it and level it off were it is needed.

I have been lucky. Friends bought the place a few years ago and I have had more horses there for 3 years. All I have done to the arena is drag it and had the edges pulled in twice a year as it has no kick boards. I have no idea when sand was last put on it but I haven't had to add any in the time I have been there.

04-12-11, 01:57 PM
I know it's already been worked out....but....I tend to work things out by visualizing the 'problem'....So.. I visualize one cubic metre of sand as a solid block. I then slice horizontally through in 25mm thicknesses. I then have 40 one metre squares....then lay them out on the arena. Get my drift? so to cover 1200 sq.m. you need 30 of these 'blocks'.....as you may guess I'm not all that mathamatical...:D

04-12-11, 02:09 PM
yeah it's cubic, i signed off and it hit me. duh! i was just looking up google actually. just looking at how to measure uneven cubes. but i'm sure someone has got it right already in this thread. i would suggest that your sand supplier would be used to calculating the measurements anyway. he could probably do it off the top of his head.
i need to do more maths. i was always bored by it.

04-12-11, 04:12 PM
Whoops, yes, cubic metres. I knew what I meant :D
KLB4, even a bit of a top up makes a huge difference so, as you so, 10 metres might be enough.