How Much Charcoal Do You Need for a BBQ?

For an average kettle BBQ (around 47-57cm), use roughly 1-1.5kg of natural lumpwood charcoal for a direct, high-heat cook such as burgers or steaks, and closer to 2-3kg if you're cooking indirectly over a longer session. As a rule of thumb, aim for around 1kg of charcoal per hour of cooking time, and always have a little extra on hand rather than running short halfway through.

That's the short version. Get it right and you'll spend less time fiddling with vents and more time actually cooking. Below, we've broken it down by grill size, cook type, and what you're putting on the grill, so you can measure out the right amount before you even strike a match.

Charcoal amounts by grill size

The single biggest factor in how much charcoal you need is the size of your BBQ. A bigger cooking surface needs a bigger, deeper bed of charcoal to heat evenly.

Grill size	Typical charcoal needed
Small/portable (up to 35cm)	0.5-1kg
Standard kettle (40-57cm)	1-1.5kg for direct grilling
Large kettle or family-size grill	2-3kg
Offset smoker or long, slow cook	2-4kg, topped up through the cook

These figures are for a single load to get started. If you're cooking for more than an hour or two, you'll need to top up as the fire burns down.

Ready to stock up? Our 3kg bag of charcoal is ideal for a standard kettle BBQ and covers one or two sessions of direct grilling. Cooking for a crowd, running a bigger grill, or planning a longer session? Our 7.5kg bag of charcoal offers better value per kg and keeps you covered without running short mid-cook. Both are made in-house from natural hardwood, with UK-wide delivery.

How much charcoal per person?

If you're planning a BBQ around numbers of guests rather than grill size, a simple way to scale is by portion. Most people eat around 200-250g of meat at a BBQ, and a rough charcoal-to-food ratio is close to 1:1 by weight for briquettes, or about 1.5x that for lumpwood, since it's less dense and burns faster.

In practice, that works out at roughly:

• 4-6 people: 1-1.5kg of lumpwood charcoal

• 8-10 people: 2-2.5kg

• Large gathering (15+): 3kg or more, plus a top-up bag

This is a starting point rather than an exact science - a warm, still evening will need less than a cold, windy one, and vegetables cook happily on far less heat than a thick steak.

Does the type of charcoal change the amount you need?

Yes. Natural lumpwood charcoal lights faster and burns hotter than briquettes, but it also burns through more quickly, so you may need slightly more of it, or a top-up sooner, for a long cook. Briquettes are denser and more uniform, so they burn more slowly and predictably, which is why some cooks prefer them for low-and-slow sessions.

For most UK back-garden BBQs, quality hardwood lumpwood charcoal is the better choice. It lights faster, reaches temperature sooner, and - if it's genuinely natural, like ours - doesn't carry the chemical smell or aftertaste that cheaper, imported charcoal often does.

Direct vs indirect heat: how it changes your charcoal needs

• Direct heat (burgers, sausages, steaks, skewers): pile the charcoal in an even, single layer across the base of the grill, or slightly banked in the centre. This uses less charcoal but burns hot and needs closer attention.

• Indirect heat (whole chicken, joints of meat, slow-cooked ribs): bank the charcoal to one side, leaving the other side empty for the food to cook away from direct flame. This uses more charcoal overall because the cook takes longer, but at a gentler, steadier temperature.

If you're not sure which you need, a good habit is to light more than you think you'll need for a direct cook and simply not use it all - unlit lumpwood charcoal can be saved and reused another time once it's fully cooled.

A simple way to measure it out

You don't need scales for every BBQ, but a few reference points help:

• A standard charcoal chimney starter holds roughly 1.5kg of lumpwood charcoal - a good single load for most kettle BBQs.

• Filling the base of a kettle BBQ one layer deep is usually enough for a quick, hot, direct cook.

• A loosely packed handful is roughly 100-150g, useful for judging smaller top-ups.

Get the fire going, spread the coals once they're grey and glowing, and adjust the vents rather than adding more charcoal to control temperature where you can - it's more efficient than overloading the grill from the start.

Why the quality of your charcoal matters as much as the quantity

Using the right amount of charcoal only gets you so far if the charcoal itself is poor quality. Cheap, imported charcoal is often padded out with smaller, inconsistent pieces and treated with chemical accelerants to help it light, which means you end up using more of it, and battling a chemical smell, to get the same result.

Black Dog BBQ charcoal is made in-house in West Sussex from Oak, Ash, and Beech harvested in woodland we manage ourselves. There are no accelerants, binders, or imported filler - just natural hardwood that lights quickly, burns hot, and holds its temperature, so the amounts above go further than they would with a lower-quality bag.