Gravel & soil calculator
Volume = area × layer thickness; tonnes = volume × density. Densities are approximate – the real weight depends on fraction and moisture. Order about 10% extra for compaction. In Estonia you can order gravel, sand and soil with delivery from TM Killustik.
You can estimate the cost of paving, edging, lawns and other landscaping work on a map at haljastuskalkulaator.ee.