The short answer: multiply every ingredient in your lemon drizzle cake recipe by 0.5, then fix the three exceptions — leavening (about 0.75× instead of 0.5×), salt (to taste), and baking time (check early). The full scaled table below uses a standard lemon drizzle cake recipe that serves 4 (one small loaf cake). Scaled, it serves about 2.
All amounts in this guide are approximate, and the recipe below is an example — a standard home-baking lemon drizzle cake recipe — so you can see the scaling worked out in numbers. Your own recipe's amounts will differ; apply the factor 0.5× to whatever your recipe calls for, and use the leavening, salt and time rules on this page for the exceptions. Flour is weighed at 120 g per cup spooned and levelled (King Arthur Baking), granulated sugar at 200 g per cup, and butter at 227 g per cup. Verify with a kitchen scale when it matters: a scale removes the guesswork that cups always carry.
The scaled recipe, in a table
| Ingredient | Original (serves 4) | Scaled ×0.5 (serves about 2) | Note |
|---|---|---|---|
| All-purpose flour | 1 1/2 cups (180 g) | 3/4 cups (90 g) | |
| Granulated sugar | 3/4 cup (150 g) | 3/8 cup (75 g) | |
| Unsalted butter, softened | 1/2 cup (114 g) | 1/4 cup (57 g) | |
| Eggs | 2 | 1 | |
| Baking powder | 1 1/2 tsp | 1 1/8 tsp | scales less than the recipe — about 0.75×, a rule of thumb from the recipe scaler guidance |
| Fine salt | 1/4 tsp | 1/8 tsp | to taste — start here, then adjust |
| Lemon zest | 1 lemon | 1/2 lemon | |
| Lemon juice | 2 tbsp | 1 tbsp | |
| Granulated sugar, for the drizzle | 1/4 cup (50 g) | 1/8 cup (25 g) |
Read the table from left to right: the middle column is the recipe as written, the next column is the same recipe multiplied by 0.5, and the note column flags the ingredients that break the rule. The baking powder uses about 0.75× (not 0.5×). Salt is listed at the scaled amount, but treat it as a starting point and taste before you commit — saltiness depends on the salt you use and the other ingredients, so a flat multiplier is a guess, not a fact.
What does not scale
Leavening
When halving a recipe, use about 0.75× the baking powder — not 0.5×. Too much leavening makes the bake rise fast and then collapse, leaving a sunken middle and a soapy or metallic taste. This is the guidance the recipe scaler gives, and it is a rule of thumb, not a sourced figure: leavening does not scale linearly, because the gas it produces escapes faster from a larger batter and the structure cannot hold it. If your lemon drizzle cake has risen and fallen before, too much leavening is the first thing to check.
Salt
Salt scales by feel, not by maths. Multiply it by 0.5 as a starting point, then taste — a halving lemon drizzle cake with salt scaled blindly can taste flat and harsh, or dull and under-seasoned, depending on the salt. Fine table salt is saltier by volume than kosher salt, so if you switch salts, adjust again. The place to fix salt is before baking, in the dough or batter: once the bake is in the oven, the salt is set, and no amount of topping will fix it afterwards.
Baking time
Baking time does not scale with the recipe. A halving lemon drizzle cake bakes at the same temperature, 350°F (175°C) for 40–45 minutes, but the time changes with batter depth and tin size, not with the amount of food. Check doneness 5–10 minutes before the recipe time, and judge by the usual tests — a skewer coming out clean, a top that springs back, edges pulling away from the tin — rather than by the clock. The baking time adjuster will work out a starting point for the new time if you tell it the old time and the new tin size.
Why halving is trickier than it looks
Halving feels like the easy direction, and in one sense it is: you are making less food, so nothing overflows and nothing needs a bigger pan. The trouble is precision. A halved recipe lives in small numbers, and small numbers punish rounding. Half of 3/4 teaspoon is 3/8 teaspoon, which no measuring spoon set contains, so you round to 1/2 teaspoon or 1/4 teaspoon and the balance of the recipe shifts. Half an egg is the classic problem: crack the egg into a small bowl, beat it lightly, and measure out half by weight (about 25 g for a large egg) or by eye, using two tablespoons of beaten egg as roughly half. The rest can go into scrambled eggs or a small omelette, so nothing is wasted.
Halving also changes how a recipe behaves in the oven. A smaller amount of batter or dough cooks faster and dries out faster, because there is more surface relative to volume. That is why the baking time rule matters even when you halve: start checking 5–10 minutes before the original time, and judge by look and feel rather than the clock. A halved lemon drizzle cake in the same size tin as the original will be thin and will overbake; use a smaller tin, and expect it to be done sooner. The pan size converter helps you pick the tin, and the baking time adjuster works out a starting point for the new time.
Worked examples
A recipe that calls for 1 1/2 cups of flour. Scaled, that becomes 3/4 cups — and if you are weighing, that is 180 g becoming 90 g. Weighing matters most at this scale, because a cup of flour can vary by 20 g or more depending on how you fill it, and a 20 g error is a much bigger share of a halved batch than of the original.
Butter, the ingredient that sets the texture. Your recipe calls for 1/2 cup of butter (114 g); scaled, that is 1/4 cup (57 g). Butter scales cleanly by the full factor, unlike leavening, so there is nothing to adjust here — just weigh it, because butter is sold by weight and the wrapper markings are approximate.
The drizzle scales with the cake. The original drizzle uses 1/4 cup of granulated sugar (50 g) and 2 tablespoons of lemon juice; scaled by 0.5×, that becomes 1/8 cup of sugar (25 g) and 1 tbsp of lemon juice. You will need about one lemon per original batch for zest and juice, so a doubled cake needs two lemons and a tripled cake needs three — buy one extra, because lemons vary in how much juice they give.
Lemon drizzle specifics: crumb, drizzle and tin
A lemon drizzle cake lives or dies on its crumb, and the crumb comes from creaming the butter and sugar properly and from the baking powder doing its job — which is why the leavening rule is the most important thing on this page. Cream the butter and sugar until pale and fluffy, about 3–4 minutes with an electric mixer, then add the eggs one at a time, then fold in the flour and baking powder gently. Over-mixing after the flour goes in develops gluten and makes a tough, close crumb instead of a tender one, and that matters more in a doubled or tripled batch, where the mixing takes longer and it is tempting to keep the mixer running.
The drizzle is what makes this cake, and it scales simply: sugar and lemon juice in the same ratio, poured over the hot cake so it soaks in and sets into a crisp, crackly top. Prick the hot cake all over with a skewer before pouring, and pour slowly so the drizzle soaks in rather than running off the sides. A doubled cake needs a bigger tin — two loaf tins are the safest choice, because a single deeper loaf takes much longer to bake through and the drizzle can make a soggy middle if the crumb is underbaked. Check doneness with a skewer 5–10 minutes before the recipe time: it should come out clean, and the top should spring back when pressed lightly.
The most common mistake is scaling the baking powder by the full factor. Doubled baking powder makes the cake rise fast and collapse, leaving a sunken middle and a soapy, metallic taste; use about 1.5× when doubling and about 2× when tripling, as a rule of thumb. The second mistake is using bottled lemon juice instead of fresh — the flavour is flat, and the drizzle will not set the same way. The third is pouring the drizzle over a cold cake, which leaves it sitting on top instead of soaking in; the cake must be hot from the oven. The fourth is opening the oven door in the first 20 minutes, which can make the cake sink.
Half an egg is the one ingredient that stops most people. The fix is simple: beat the egg first, then use half of the beaten egg. Two tablespoons of beaten egg is close enough to half a large egg for most baking, and weighing is better still — half a large egg is about 25 g. Do not try to halve an egg by cracking it and guessing which half of the shell holds the right amount; it never works, and the recipe suffers for it.
Use a smaller tin or dish than the original recipe calls for. A halved lemon drizzle cake spread thin across a full-size tin will bake too fast at the edges and dry out before the middle is set. If the original uses a 9-inch round tin, a 6-inch round tin holds roughly half the batter, and a loaf tin can be swapped for a smaller one or for ramekins. Grease and line the smaller tin exactly as you would the large one, and keep the oven temperature the same — only the time changes.
Storing and making ahead
Lemon drizzle cake keeps for 3–4 days in an airtight container at room temperature, and it actually improves on the second day as the drizzle soaks through the crumb. It freezes well for up to 3 months, wrapped tightly — freeze it before adding the drizzle if you can, then drizzle it fresh after defrosting. Do not refrigerate it; the fridge dries the crumb out and dulls the lemon flavour.
Frequently asked questions
Can I just multiply everything by 0.5?
Most things, yes — flour, sugar, butter, eggs, milk and flavourings all multiply by the full factor. The exceptions are leavening, which scales at about 0.75× (a rule of thumb), salt, which you should scale as a starting point and then adjust by taste, and baking time, which does not scale at all and must be judged by doneness. If you multiply everything blindly, the most likely failure is a bake that rises and collapses.
How much baking powder do I use when halving?
Use about 0.75× the original amount, not 0.5×. For the example recipe on this page, that means 1 1/8 tsp instead of the 3/4 tsp a straight multiplication would give. This is a rule of thumb from the recipe scaler guidance, not a sourced figure, and it is the single most useful scaling rule there is: too much leavening is the most common reason a scaled bake collapses.
Does the baking time change when I scale from 4 to 2 servings?
Yes, but not by the factor. Baking time changes with batter depth and tin size, so a larger batch in a bigger tin takes longer, and a smaller batch in a smaller tin takes less time — but neither changes in proportion to the recipe. Check doneness 5–10 minutes before the recipe time, use the skewer test, and cover the top with foil if it browns before the middle is set. The baking time adjuster will work out a starting point for the new time.
What size tin do I need for the scaled recipe?
Use the pan size converter and match the volume, not the diameter: a tin's volume grows with the square of its width, so a small increase in diameter is a large increase in volume. Two original-size tins are often the safest choice for a doubled or tripled recipe, because each one then bakes exactly like the original. For a halved recipe, use a tin about half the volume of the original.
How do I know when the scaled cake is done?
Use a skewer, not the clock: push it into the middle of the cake and it should come out clean, and the top should spring back when pressed lightly. Start checking 5–10 minutes before the recipe time, because a scaled cake in a different tin bakes at a different rate. If the top is browning too fast, cover it loosely with foil and keep baking until the middle is set.
Should I scale the salt by the full factor?
Use the scaled amount as a starting point, then taste and adjust. Salt perception depends on the salt you use — fine table salt is saltier by volume than kosher salt — and on the other ingredients, so a flat multiplier is a guess. In sweet baking, a little extra salt sharpens the flavour; too much makes it taste flat and harsh. Taste the dough or batter before baking, and remember you can always add a pinch, but you cannot take salt out.