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Concrete, Resin & Epoxy Volume Planner

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Choose how to continue

Free access lets you try every project type and shape with sample-sized projects — up to 2 litres total and up to 2 identical items, enough to see exactly how the tool works. Full access removes those limits for real project sizes, plus the polished, printable project sheet, a copyable shopping list, and a downloadable offline copy of the tool.

Quick start

Project

Dimensions

60%

For an odd or organic shape, measure a box that fully contains it, then estimate how much of that box the shape actually fills.

Add one row per differently-sized cavity, mould or groove. Give each row its own quantity if several cavities share that size.

Free preview is limited to 2 cavities — unlock full access for more.

Free preview is limited to 2 identical items — unlock full access for larger runs.

Material & mix

Auto-filled for the selected material — change it if your product's data sheet gives a different figure.

Waste & batching

10%

Cost

Your project

Free preview is limited to sample-sized projects (up to 2L, up to 2 items) with no printing or export — unlock full access for real project sizes and these three actions.

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This project is bigger than the free preview

Free preview covers sample-sized projects — up to 2 litres total and up to 2 identical items — so you can see the tool works. Unlock full access to see the exact numbers for a project this size.

Unlock Full Access —
Total needed (incl. waste) 0 ml
Volume
0 ml
Weight
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Mix breakdown
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Bags / kits needed
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Estimated cost
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Batch plan

Shopping list


      

      


      

        
Things to check before you pour

        
    
      
    

      
    
        
    Tips for this project
    
        
      
      
      
    
      
  
      

  
      

      



      



      
  
      
    
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      About the Concrete, Resin & Epoxy Volume Planner
      
  
      This tool works out how much material to buy and mix for casting, coating and construction projects — concrete, epoxy resin, polyester resin, silicone mould rubber and plaster — based on the actual shape and dimensions of what you're pouring. Rather than a single generic volume calculator, it adapts to nine common project types, splits large pours into a batch plan you can actually follow, and surfaces the specific mistakes that ruin each type of project.
      

  
      Who it's for
      
  
      Resin artists pouring coasters, trays and river tables; woodworkers and CNC engravers filling inlays and grooves; garden and home DIYers setting fence posts or pouring a shed base; and craft sellers casting multiples from silicone or plaster moulds. If you've ever mixed too little resin partway through a pour, or ordered the wrong number of concrete bags, this is built for that exact problem.
      

  
      Common uses
      
  

  
      How to use it
      
  
        
    
      1. Pick your project type and the shape that matches what you're measuring — rectangle, circle, ring, an irregular shape, or several cavities at once.
        2. 
    
      2. Enter your dimensions and pour depth in whichever unit you measured in (mm, cm, m or inches).
        3. 
    
      3. Choose your material — this fills in a sensible default mix ratio, density and waste allowance, which you can still adjust.
        4. 
    
      4. Add a price and, if you know it, a bag/kit size, plus a batch limit and pot life if your material needs splitting into stages.
        5. 
    
      5. Read off the total volume, weight, mix breakdown, batch plan and cost, and check the warnings and tips panels before you start mixing.
        6. 
  
      

  
      Frequently asked questions
      
  
      
    
      How much resin do I need for a river table?
      
    
      Measure the length and average width of the river channel and your pour depth, then enter those with your resin's mix ratio. River tables are usually poured in layers, so set a batch limit matching your resin's maximum pour depth and the tool will lay out a layer-by-layer plan.
      
  
      
  
      
    
      Do I need to add extra resin or concrete for waste?
      
    
      Yes — mixing cups, stir sticks, drips and porous surfaces all soak up material. Most people add 5-10% extra for resin and epoxy, and a similar margin for concrete to cover uneven ground. Use the waste slider to set this per project.
      
  
      
  
      
    
      What's the difference between coating resin and deep pour resin here?
      
    
      Coating (table top) epoxy is usually mixed close to 1:1 and poured thin. Deep pour epoxy uses a different ratio, often around 2:1, and is formulated to cure without overheating in thicker layers. Choose whichever matches your actual product, since it changes the default ratio and density used in the calculations.
      
  
      
  
      
    
      Can I use this for silicone mould making?
      
    
      Yes. Choose Silicone mould rubber as the material, and if you're casting a mould around an object, use the subtract-volume field to remove the object's volume from the mould box, so you only order silicone for the space it actually fills.
      
  
      
  
      
    
      Why has my project been split into several batches?
      
    
      If you set a batch size limit — matching your resin's maximum safe pour volume or your mixing container size — the total is split into batches at or under that limit, so you know how many mixes to prepare and pour within your material's working time.
      
  
      

      


      
  
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