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TCalculator.

Top Soil Calculator

This free top soil calculator gives you an answer in a couple of seconds, and shows the full working underneath so you can check it rather than take it on trust. Change any value and the result updates immediately. Nothing is stored, nothing is sent anywhere, and there is no sign-up.

Enter your values

Area covered by one roll, bag or box

Units required

56

Area
50 m²
Area including waste
55 m²

How this is calculated

  1. 1

    Calculate the area

    area = length × width

    area = 10 × 5

    = 50 m²

  2. 2

    Add waste for cuts and offcuts

    total = area × (1 + waste%)

    total = 50 × 1.1

    = 55 m²

  3. 3

    Divide by the coverage of one unit, rounding up

    units = ⌈total ÷ unit size⌉

    units = ⌈55 ÷ 1⌉

    = 56

How to use this top soil calculator

  1. Fill in your values. Every field starts with a sensible default, so you can change one number at a time and watch what it does to the result.
  2. Read the result. The headline figure sits in the pink box, with supporting numbers listed below it.
  3. Check the working. The breakdown shows each formula and the same formula with your numbers substituted in, so you can follow the method or reproduce it by hand.