Should You Make Your Own Yogurt at Home?

Estimated reading time at 200 wpm: 13 minutes

It sits there on the supermarket shelf, a perfectly unassuming white plastic tub. You buy it weekly without a second thought, perhaps paying a premium for the thick, dense Greek style you favour, accepting the cost as just another line on the grocery bill. If you’re not a yoghurt person, move on swiftly.

But what if that very tub contains not just your breakfast, but the living key to never buying it again? The idea sounds faintly ridiculous, like some kitchen alchemy myth, yet it is a simple biological truth: the spoonful of live yoghurt you are about to eat can be used to transform ordinary milk into more yoghurt, and more, theoretically for the rest of your life!

For a great many yoghurt lovers, this revelation arrives as a genuine surprise. We have become so thoroughly disconnected from the ancient processes of fermentation that the notion of breeding our own yoghurt cultures on the back of the stove feels almost impossibly resourceful. And alongside that surprise comes a second, more tempting thought: if I can make it myself, I can save some money. That question—whether the savings are real, or whether they evaporate somewhere between the gas hob and the straining cloth—is precisely where this exploration begins.

How to Make Your Own Yoghurt (Aiming for That Fage Thickness)

Before we talk about whether this is worth your time, let’s talk about how. If you are the sort of person who gravitates towards a 950g tub of Fage and feels faintly cheated by anything thinner, you are chasing a particular texture. That dense, spoon-stands-up, almost-chewable quality is not achieved with thickeners or starches. It is the result of a brutally simple process: make normal yoghurt, then strain the life out of it until what remains is pure, concentrated dairy protein. This recipe assumes you want that outcome. It is long, but only because it is honest.

Equipment

• A large, heavy-bottomed saucepan (stainless steel or enamelled; avoid thin aluminium, which can scorch)
• A probe thermometer (non-negotiable; guessing the temperature will end in failure)
• A whisk
• A large glass or ceramic bowl or container for incubation
• A warm, still place: an airing cupboard, an oven with only the light on, or a dedicated yoghurt maker
• A large sieve
• A clean muslin cloth, fine cotton tea towel, or purpose-made straining bag
• A second large bowl for catching whey
• A kitchen scale

Ingredients

• 3.8 litres of whole milk (the blue-top stuff; do not use skimmed or semi-skimmed if you want the full Fage experience)
• 2 heaped tablespoons of plain Fage yoghurt (must state “live and active cultures” on the tub; use it at room temperature, not straight from the fridge)

Method

1. Heat the milk Pour all 3.8 litres of milk into your saucepan. Clip on the probe thermometer. Heat the milk gently over a medium flame, stirring occasionally with the whisk to prevent a skin forming and to distribute the heat evenly. You are aiming for 85°C. Do not rush this. A slow, steady climb to temperature gives the proteins time to relax and reconfigure. Once the milk reaches 85°C, hold it there for a full ten minutes. This step is doing two things: it is denaturing the whey proteins so they participate in forming a firm gel later, and it is effectively sterilising the milk, wiping out any spoilage bacteria that would otherwise compete with your yoghurt culture.

2. Cool the milk Place the saucepan in a sink filled with cold water. Keep the thermometer in place and stir gently. Your target is 43°C. This cooling phase must happen as quickly as reasonably possible, because the milk is vulnerable while it sits in the lukewarm danger zone where unwanted bacteria thrive. Do not be tempted to add the yoghurt starter too early; anything above 50°C will kill the live cultures stone dead. If you undershoot to 38°C, you will have sluggish fermentation. 43°C is the sweet spot.

3. Inoculate Ladle a mugful of the warm milk into a small bowl. Add the two heaped tablespoons of Fage and whisk until completely smooth and dispersed. Pour this mixture back into the main pot of warm milk and whisk gently but thoroughly to distribute billions of bacteria evenly throughout your future yoghurt.

4. Incubate Pour the inoculated milk into your incubation container. Place it in your chosen warm spot—an oven with just the light on works brilliantly and maintains roughly 40–45°C. Now, leave it completely alone. Do not stir it, do not jostle it, do not open the door to check on it. The bacteria are building a delicate protein matrix, and any disturbance can cause whey separation. Incubate for a minimum of 8 hours and up to 12. The longer you wait, the tarter and firmer the yoghurt will be. You will know it is ready when the surface wobbles like a set custard if you gently tilt the container.

5. Chill Transfer the set yoghurt directly to the fridge without stirring. Let it cool completely, ideally overnight. This firms the structure and arrests fermentation. What you have now is a perfectly respectable plain yoghurt—but it is not Fage. Not yet.

6. Strain Line your sieve with muslin or a clean tea towel and suspend it over a large bowl. Spoon the cold, set yoghurt into the cloth. Place the whole apparatus in the fridge. Over the next four to six hours, liquid whey will drip into the bowl below, and the yoghurt above will thicken dramatically. The longer you strain, the denser it becomes. For a Fage-level texture, you want to lose nearly two-thirds of the original volume. Weigh the bowl of yoghurt occasionally; when the solids weigh 950g, you have precisely recreated your supermarket tub. Reserve the whey for bread, smoothies, or curry bases.

7. Save your starter Before you eat it all, spoon two heaped tablespoons of your fresh, unstrained yoghurt into a small, scrupulously clean jar. Label it and freeze it. This is your starter for the next batch, so you never need buy a starter tub again.

The Cost: Is It Actually Cheaper?

We have the method. Now comes the question that brought you here: does this save you money, or are you working for free in your own kitchen?

Let us assume, generously, that you already own the equipment. A saucepan, a thermometer, a whisk, a muslin cloth—these are standard items in a keen cook’s arsenal, and we will not amortise their cost across batches of yoghurt. You are not buying anything new. You are standing in your kitchen on a Tuesday evening with a litre of milk and a dollop of Fage.

The only costs that matter, then, are the milk, the starter, and the energy to heat it.

The Milk

For 950g of dense, strained yoghurt, you need 3.8 litres of whole milk. At the time of writing, a 2.27-litre (4-pint) bottle of standard whole milk from a major supermarket costs £1.55. You will need one full bottle plus roughly 1.53 litres from a second bottle.

• Cost of 3.8 litres of whole milk: £2.59

The Starter

Your first batch requires two heaped tablespoons of shop-bought Fage. A 950g tub contains roughly 50 tablespoons, so two tablespoons represent about one twenty-fifth of the tub. At £5.50 per tub, that starter costs:

• Cost of starter (batch one): £0.22

For every subsequent batch, your starter comes from a frozen portion of your previous homemade yoghurt. Cost: £0.00. We will calculate based on an ongoing cycle, because that is the promise of perpetual yoghurt.

The Gas

This is where most blog posts wave their hands. Let us be precise. Heating 3.8 litres of milk from fridge temperature (4°C) to 85°C requires approximately 0.35 kWh of energy, based on the specific heat capacity of milk. A gas stove is roughly 40% efficient at transferring heat to the pot, so the actual gas consumed is closer to 0.87 kWh. Holding the milk at 85°C for ten minutes adds perhaps another 0.20 kWh. Total gas used: roughly 1.07 kWh.

At the current UK energy price cap, domestic gas costs approximately 6.2 pence per kWh.

• Cost of gas per batch: £0.07

The Total

The Cost Advantage

Your benchmark is a 950g tub of Fage, which costs between £5.00 and £6.00 depending on where you shop and whether a deal is running. Let us assume an average price of £5.50.

• Homemade (ongoing) cost: £2.66
• Supermarket cost: £5.50
• Saving per 950g tub: £2.84

That is a saving of roughly 52%. In purely financial terms, you are halving your yoghurt bill. If your household consumes one 950g tub per week, that is a saving of around £147 per year.

But savings are only half the story. That £2.84 you keep in your pocket does not appear by magic. It arrives in exchange for your time, your attention, and your willingness to plan a day around the needs of a fermenting dairy product. Whether that trade is a bargain or a bad deal depends entirely on what your hours are worth to you.

The Hidden Cost: Why the Saving Isn’t Everything

A 52% saving sounds compelling on paper. Halve your yoghurt bill, pocket nearly three quid a week, and feel quietly smug every time you walk past the dairy aisle. But if the financial case were the whole story, every Fage lover in the country would be standing over a saucepan tomorrow. They are not. Here is why the numbers alone do not capture the full transaction.

The Time Cost

Money is not the currency you spend most freely when making yoghurt. Time is.

Let us walk through a batch honestly, stopwatch in hand, assuming you are not a commercial dairy but a person with a job, a family, and a finite tolerance for standing in front of a hob.

• Heating the milk to 85°C: 20 to 25 minutes of active, present stirring. You cannot walk away; milk scorches the moment you turn your back.
• Cooling the milk to 43°C: 10 to 15 minutes of standing at the sink, stirring, monitoring the thermometer, swapping out water.
• Inoculating and transferring: 5 minutes of whisking and pouring.
• Straining and cleanup: 10 minutes of setting up the sieve, scraping out the cloth, washing sticky yoghurt from bowls and utensils.
• Total active time: approximately 45 minutes.

Forty-five minutes of your hands and your attention, not spread across a week but concentrated in a single evening, plus a brief morning engagement to move the straining yoghurt to a container.

But wait – what about getting the milk? Driving to the local Tesco? Delivery from Tesco to home? Any time and energy involved in that? These are things to consider.

Then there is the passive time. Incubation demands eight to twelve uninterrupted hours in a warm, still space. Straining demands another four to six hours of fridge occupancy. The yoghurt dictates your schedule: if the incubation finishes at midnight, you are up at midnight. If you need the fridge shelf for something else, the yoghurt does not care. You are tethered to the process for the better part of a full day.

The Hourly Wage

If we value your active time at the UK National Living Wage of £11.44 per hour, those 45 minutes of labour cost roughly £8.58. You are saving £2.84 on the yoghurt. That means you are effectively paying yourself an hourly rate of about £3.79. Less than a third of the legal minimum.

Some home economists argue that cooking time does not count because you might enjoy it, or because it replaces time you would otherwise spend scrolling on your phone. That is a fair point, and we will come to it. But if you are considering yoghurt-making purely as a money-saving tactic, you are accepting a wage that no employer could legally offer you.

The Mental Load

Beyond the clock, there is the cognitive weight. Yoghurt-making requires planning. You must ensure you have 3.8 litres of milk in the fridge and two spare hours across an evening and the following morning. You must remember to freeze the starter before you eat it all. You must hold in your head the knowledge that a living culture is mid-process and will not wait for your convenience.

This is not difficult, but it is labour of a kind. It occupies mental shelf space. For some, that space is better reserved for children, work, rest, or simply the freedom of an unplanned evening.

The Failure Rate

Home yoghurt-making is simple science, but it is not foolproof. Batches fail. The milk gets too hot and kills the culture. The oven light burns out overnight and the temperature drops. A wild yeast from a sourdough starter drifting on the kitchen air outcompetes your bacteria and leaves you with something that smells faintly of beer and disappointment. A failed batch means 3.8 litres of milk and an evening’s effort are poured down the sink. The emotional cost of that waste—frustration, guilt, the sense of having failed at something supposedly easy—is real, even if it never appears on a spreadsheet.

The Opportunity Cost of the Saving

Finally, consider what you are actually doing with the £2.84 you save. If you are putting it into a holiday fund or paying down a debt, it has purpose and meaning. But if it quietly dissolves into the weekly shop, swallowed by a slightly fancier cheese or an extra bottle of wine, the financial argument loses much of its force. You have traded real time for a saving you never truly feel.

None of this is to say you should not make yoghurt. It is only to say that the cost advantage, while real, is not free. It is purchased with your hours, your attention, and your tolerance for the occasional failure. Whether that price feels like a bargain or a burden is a deeply personal calculation.

The Conclusion: A Decision That Depends Entirely on You

The numbers refuse to give a single, clean answer. The spreadsheet says one thing, the clock another. There is no universal verdict on whether you should make your own yoghurt. There is only the question of which sort of person you are.

Make your own if… the process itself brings you joy. The slow climb of the thermometer, the miraculous overnight set, the drip of whey through muslin in a quiet fridge—these things genuinely satisfy you. The £2.84 saving is a pleasant bonus, not the motivation. You like being the sort of person who makes their own yoghurt.

Buy it from the supermarket if… your time is already spoken for. Your evenings are a negotiation between tiredness and the small tasks that keep a household running. A tub of Fage at £5.50 is not just dairy; it is a gift you buy yourself. Perfectly thick, reliably tangy, demanding nothing except fridge space. You are at peace with paying for the hours of your life that remain unspent.

Or choose the middle ground. Make yoghurt occasionally, when a quiet weekend invites a slow kitchen project. Make basic, unstirred yoghurt for everyday eating and continue buying Fage as a deliberate treat. Knowledge does not demand consistency. You now know how to turn milk into yoghurt, and that knowledge has value whether you use it weekly or yearly. It sits ready in your back pocket.

The supermarket will always be there, with its bright, cold shelves. The saucepan will always be there too. Neither choice is wrong. Choose the one that makes your mornings better, and do not apologise for it either way.