Welcome to Quality Garden Supplies

Shop Online  Call Us Now

Working out how much topsoil you need.

Working out how much topsoil you need.

Working out how much topsoil you need can be a bit of a daunting task, is it just a case of guessing?  Most people do just guess and often get it wrong!

Follow our guide below to hopefully eliminate the guess work and save you alot of hassel and £'s.

Topsoil is usually sold in tonnes, but for now we are going to forget about weight and concentrate on volume.

Step 1 - Measure the Length & Width of the Area

Firstly work out the area you want to cover with topsoil in metres by measuring the length and width of the flower bed, planter or new lawn that you want to fill with soil. For example of you have a planter that is 200 cm long by 50 cm wide = 2m x 0.5 m which = 1 square meters.

Step 2 - Measure the Depth 

Next meaure the depth of the area that you want to fill with soil or the height of the planter you want to fill. i.e 10cm depth = 0.1 meters or 5cm depth = 0.05 meters.

At this point you have two options: Option 1) Use a Topsoil Calculator to work out the amount in tonnes you need (skip steps 3 & 4) or go to Step 3.

Step 3 - Work out the volume

Next multiply the area from step 1 by the depth from step two :

eg:  you are trying to work out how much topsoil you need for an area that needs topping up with soil before laying new turf:

You have meaured the length at 10 meters and the width is 6.35 meters (635cm) 

You want to increase the height of the area by 5 cm (0.05m)

so simply multiply the length by the width by the depth (all in metres) i.e 10m x 6.35m x 0.05m = 3.175m3 (cubic metres)

This gives you the volume of the area you wish to fill with soil in cubic metres (m3)

Step 4 - Convert the volume in cubic metres to tonnes

Convert the volume in cubic metres to tonnes by multipling the volume by the bulk density of topsoil. 

As a general rule there is about 1.4 tonnes of topsoil to the cubic metre, therefore multiply the volume (as calculated above) by 1.4

i.e 3.175m3 x 1.4 = 4.45 tonnes

For more information on topsoil visit our specialist topsoil site here.

Things You Didn't Know About Earthworms
How to Make Sloe Gin

Latest Tweets

Are you a landlord? Check out our tips for low-cost, low-maintenance gardens your tenants will love: topsoilshop.co.uk/knowledge-base
New Blog Post..... Grow up! How to produce huge yields in a tiny garden -   Winter is, meteorologically speaking, behind us (even with its particularly nasty sting in the tail) and we’re looking forward to a new year full of gardening successes. How t... ow.ly/h49v50gKvoF

Contact us

  • Sales Office.
    12 Stafford Street
    ST21 6BH

    Sales Line: 0871 971 0988
    Customer Services: 0333 321 6896
    Fax : 01785 330 837
  • Click Here to Contact us