How much icing do you need to cover a cake?

Follow this helpful cake covering guide to learn how much icing you need to cover a cake or cake board, with handy top tips for covering your cake!

Brought to you by Britt Box from She Who Bakes

Top Tips

  1. Knead the sugarpaste until it's soft and pliable otherwise it may crack or tear.
  2. Roll out on a surface dusted with cornflour. Use 5mm (¼in) spacers to help you roll out your sugarpaste to an even thickness.
  3. Use your rolling pin to lift your sugarpaste to avoid fingerprint marks or tears.
  4. Use spacers to smooth down your sugarpaste once on your cake.
  5. Leave to ‘set’ overnight before decorating.

Cake covering guide

Cake covered with red sugarpaste

The below chart is based on an icing thickness of 5mm (¼in) and a cake that is 8-9cm (3-3½in) deep. This is a guideline and you may find you need slightly more or less depending on your cake.

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Covering a cake:


  • 15cm (6in) / 14cm (5in) - 500g (1lb 1oz)
  • 18cm (7in) / 15cm (6in) - 700g (1lb 6oz)
  • 20cm (8in) / 18cm (7in)  - 800g (1lb 7oz)
  • 23cm (9in) / 25cm (10in) - 1kg (2lb 2oz)
  • 25cm (10in) / 27cm (11in) - 1.3kg (2lb 9oz)
  • 27cm (11in) / 30cm (12in) - 1.55kg (3lb 3oz)
  • 30cm (12in) / 33cm (13in) - 2kg (4lb 4oz)  

Covering a cake board:


  • 15cm (6in)  / 14cm (5in) - 100g (3½oz)
  • 18cm (7in)  / 15cm (6in) - 250g (9oz)
  • 20cm (8in) / 18cm (7in) - 300g (10½oz)
  • 23cm (9in) / 25cm (10in) - 450g (1lb)
  • 25cm (10in) / 27cm (11in) - 500g (1lb 1oz)
  • 27cm (11in) / 30cm (12in) - 650g (1lb 4oz)
  • 30cm (12in) / 33cm (13in) - 700g (1lb 6oz)  

How to cover a cake board

How to cover a cake board

A cake board is an extension of your cake and should be used as such, but it's often, and easily, overlooked. Cake boards are perfect for adding a message, continuing the design or having a completely separate design altogether!

Covering a cake board doesn’t have to be expensive. You can use whatever sugarpaste you have leftover from icing your cake or a small pack of sugarpaste from a supermarket.

To cover a cake board in sugarpaste:

  1. Roll out your icing to 5mm (¼in) thick on a cornfloured surface, turning the sugarpaste as you roll to get an even shape and to stop it sticking.
  2. Spray your drum lightly with water, dampen with a piece of kitchen roll or paint with piping gel.
  3. Then use your rolling pin to lift your sugarpaste and lay it gently on the board, securing it with your hand and cutting off the excess with a sharp knife. For best results, leave to set overnight.

How to fix cracked sugarpaste

Covering a cake with sugarpaste

If your sugarpaste has started to crack or tear, never fear, we can fix it!

Using your hands or a smoother, gently push the sugarpaste back together and work in circular motions with your palm or smoother until the cracks lessen and vanish. This must be done when the sugarpaste is still soft, but be gentle with it.

If you have a bit of a tear, firstly, see if you can gently bring the two pieces of sugarpaste back together by pushing at either side. Once you have the two pieces of sugarpaste back together, use the above method by smoothing gently in circular motions to lessen the crack. If there’s a line visible where you have joined it back together, you can always cover it with a well-placed decoration.

If the above methods haven’t worked or if you have a full blown hole in your sugarpaste, don’t panic! To patch it up, roll out the same colour sugarpaste and cut out a shape that resembles the hole. Place this into the gap and gently smooth it into place with your hands and/or a smoother. There may be a faint line visible once patched up but again, a carefully placed decoration solves most cake decorating problems!

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