Kiln Size Calculator: Find the Right Kiln for Your Pottery Studio
Tell us what you make and we'll calculate the right size — then show you every matching kiln we stock.
Capacity estimates use average pottery dimensions with kiln-spacing included — actual load will vary by piece shape and shelf layout.
Prices shown include VAT. Power requirements should be verified before purchasing — call us on 01206 648025 for free advice.
How to Choose the Right Kiln Size for Your Pottery
Choosing the right kiln is one of the most important purchases you'll make as a potter — too small and you'll be firing constantly; too large and you'll be running half-empty loads and overpaying on electricity. The right kiln matches your actual output, your power supply, and the way you work. This calculator takes a practical approach: enter what you make per firing and we'll calculate the capacity you need, then show you every matching kiln from our full UK range.
Start with your output, not the most impressive spec sheet
The most reliable way to size a kiln is to count the pieces you make in a typical month and divide by your expected firing frequency. If you produce 20 mugs and 10 bowls a month and plan to fire every two weeks, you need a kiln that can hold 10 mugs and 5 bowls per load — roughly 30–40 litres once you account for spacing and kiln furniture. Our calculator does this maths automatically, using realistic average volume figures for each piece type. Starting too large almost always means higher electricity bills per piece; starting too small means more firings and more wear on elements.
The 13A socket rule — what it means for UK home studios
One of the most important practical constraints for home and garage potters in the UK is the standard 13A plug socket. Kilns up to approximately 2.5–3 kW can run from a 13A household socket, covering most kilns in the 16–62 litre range. This is a significant advantage: no electrician's visit, no rewiring, no landlord permissions required. Once you move beyond about 62–65 litres, you'll typically need a dedicated 32A or 40A supply — a one-off installation cost that's well worth it for the capacity gain. Our calculator filters by your power supply automatically, so you only see kilns that work with what you have.
Top-load vs front-load kilns
For most hobby and studio potters, a top-loading kiln is the practical default. They're more affordable, widely available as 13A plug-in models, and straightforward to load with shelves and kiln furniture. Front-loading kilns come into their own for large or tall pieces — vases, sculptures, or plates that are awkward to lower in from above — and are easier on your back for heavy batch loads. Most kilns under 40 litres are top-load; front-load options tend to start from around 68 litres. Browse our full kilns range to compare both types side by side.
Temperature range and clay compatibility
If you only work with earthenware, a kiln rated to 1100°C may be sufficient — and will generally cost less to run than a 1300°C kiln. However, if you plan to fire stoneware or porcelain at cone 6–10, you need a kiln rated to at least 1280–1300°C. Most modern hobby kilns from Kilncare, Nabertherm and Potterycrafts reach 1300°C, making them versatile for all clay types. Our calculator's temperature filter ensures the kilns shown will actually reach the temperatures you need.
Starting small and scaling up
Many UK potters start with a compact 13A kiln and upgrade as their output grows. A 46-litre kiln in the £3,000–£3,500 range gives you a capable working kiln with minimal installation overhead, and the secondhand market for quality hobby kilns is strong if you outgrow it. Once you've settled on a size, use our kiln firing cost calculator to understand the electricity costs before you commit — knowing your running costs from day one helps you price your work accurately and plan your studio finances with confidence.
Frequently Asked Questions
What size kiln do I need for pottery?
For hobby potters making mugs and small bowls, a 7–18 litre kiln is usually sufficient. If you make larger pieces like vases or plates, look for 18–40 litres. Full-time studio potters or small production studios typically need 40–80 litres. Our kiln size calculator helps match your output to the right capacity.
How many mugs fit in a kiln?
A standard mug takes up roughly 0.5–1 litre of kiln space. A 7-litre kiln fits approximately 6–10 mugs per firing; a 20-litre kiln fits 18–28 mugs; a 40-litre kiln fits 40–60 mugs. You can often stack smaller items with kiln furniture to maximise capacity.
Do I need a dedicated electrical supply for a kiln?
Kilns up to about 2.5 kW can run on a standard 13A UK plug socket — these are typically up to 15–20 litres. Larger kilns require a dedicated 32A or higher supply installed by a qualified electrician. Always check the kiln's amperage before purchasing, especially if you're renting your studio space.
What is the difference between a top-load and front-load kiln?
Top-load kilns are the most common for hobby and studio potters — they're more affordable, hold heat well, and are easier to load with kiln furniture. Front-load (front-opening) kilns are better for large, tall pieces like vases or sculptures and make loading easier on your back. Most hobby kilns under 40 litres are top-load.
What temperature do I need my kiln to reach?
Earthenware clays fire to cone 06–04 (approximately 1000–1060°C). Stoneware requires cone 6–10 (1220–1300°C). Porcelain typically fires to cone 6–10 as well. Most modern hobby kilns reach 1300°C, making them suitable for all clay types. If you fire primarily earthenware, a lower-temperature kiln is cheaper to run.
Can I put a kiln in my home or garage?
Yes — many potters fire kilns in garages, sheds, or even spare rooms with proper ventilation. UK regulations require adequate ventilation to remove fumes from clay and glaze. A small top-loading kiln on a 13A socket is the safest option for home use. Always check with your insurer before firing at home.