Macros for Cutting — Women Age 30-34 (Low-Carb)

For a woman aged 30–34 who is looking to lose fat while keeping as much muscle as possible, the numbers on this page are: 1639 kcal a day, split into 121 g of protein, 84 g of carbohydrate and 91 g of fat. That is the headline result, and everything below shows how it was worked out — the basal metabolic rate from the Mifflin-St Jeor equation (Mifflin et al. 1990), the activity multiplier, the goal adjustment, and the Atwater energy values of 4 kcal per gram of protein, 4 kcal per gram of carbohydrate and 9 kcal per gram of fat (Atwater 1896; USDA).

The worked example assumes a woman aged 32 weighing 67 kg and 165 cm tall, moderately active — that means exercise or active work on most days, the 1.55 activity multiplier. Those are assumptions for illustration, stated plainly so you can see exactly where every number comes from. Your own weight, height, age and activity level will give different numbers, and the Macro Calculator will work them out for you in seconds.

A macro split is only useful if it is built on a calorie target that fits the goal. A cutting split at maintenance calories will not cut anything, and a bulking split at a deficit will not build anything. So this page starts with the calories, then splits them — in that order, because the order is the whole logic of the thing. This page uses a low-carbohydrate split, with protein set first, carbohydrate capped at 20% of total calories and the rest from fat. This is not a ketogenic diet — keto typically means under 10% of calories from carbohydrate, or 20–50 g of net carbs a day — but it is low enough that bread, rice and pasta become side dishes rather than the base of the meal. Fibre and vegetables still matter: a low-carb diet that drops vegetables is a worse diet, not a better one.

Use the macro calculator for your own numbers

The figures here are for one specific person: a woman aged 30–34, 67 kg, 165 cm, moderately active, cutting on a low-carb split. To get your own split, use the Keto Macro Calculator — enter your weight, height, age, sex, activity level and goal, and it returns your calorie target and your protein, carbohydrate and fat in grams. If you want to check the protein figure separately, the Protein Calculator works it out from your body weight and activity alone.

Related macro pages for the same calculation at other ages and diet styles:

The formulas, shown and cited

Two published systems do the work on this page. The first is the Mifflin-St Jeor equation for basal metabolic rate (Mifflin et al., American Journal of Clinical Nutrition 1990), which estimates the calories you burn at complete rest:

Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5

Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161

The second is the Atwater system (Atwater 1896; USDA), which gives the energy in food:

Protein: 4 kcal per gram · Carbohydrate: 4 kcal per gram · Fat: 9 kcal per gram

Worked through for this page's assumed woman (67 kg, 165 cm, age 32):

  • BMR = 10 × 67 + 6.25 × 165 − 5 × 32 − 161 = 1380 kcal a day at rest
  • TDEE = BMR × 1.55 (moderately active) = 1380 × 1.55 = 2139 kcal a day
  • Goal adjustment (cutting): 2139 − 500 = 1639 kcal a day

The safety floors apply here and are respected: the target of 1639 kcal is above the minimum safe intake of 1200 kcal a day for women. No target on this page ever goes below 1,200 kcal a day for women or 1,500 kcal a day for men, and nobody should eat below those floors without medical supervision.

The macro split, with the maths shown

Protein is set first, from body weight, because the evidence on protein is the strongest part of sports nutrition. For cutting, the target used here is 1.8 g per kilogram of body weight per day, which sits inside the published range of 1.6–2.2 g/kg for lifters and dieters (Morton et al. 2018) — and above the 0.8 g/kg that covers sedentary adults. At 67 kg, that is 1.8 × 67 = 121 g of protein a day, worth 121 × 4 = 484 kcal.

Then the remaining calories are split according to the diet style. This page uses a low-carbohydrate split, with protein set first, carbohydrate capped at 20% of total calories and the rest from fat. This is not a ketogenic diet — keto typically means under 10% of calories from carbohydrate, or 20–50 g of net carbs a day — but it is low enough that bread, rice and pasta become side dishes rather than the base of the meal. Fibre and vegetables still matter: a low-carb diet that drops vegetables is a worse diet, not a better one.

Macro Grams per day kcal per day % of calories
Protein 121 g 484 kcal 30%
Carbohydrate 84 g 336 kcal 21%
Fat 91 g 819 kcal 50%
Total — 1639 kcal 100%

Check the arithmetic: 484 + 336 + 819 = 1639 kcal, which matches the 1639 kcal target. carbohydrate is capped at 20% of calories — 84 g, worth 336 kcal — and fat takes everything left after protein and carbohydrate, 91 g (50% of calories). If those numbers ever disagree on a page like this, the page is wrong — the grams and the calories must always reconcile through the 4/4/9 Atwater values, and on this page they do.

Note what the split does not do: it does not tell you which foods to eat, and it does not say anything about food quality. 121 g of protein from chicken, lentils and Greek yoghurt is not the same diet as 121 g of protein from processed meat, even though the macro table looks identical. The numbers are a framework; the food choices inside the framework are where health actually lives.

How the numbers change with activity and goal

The same person at a different activity level has a different maintenance level, and therefore a different cutting target. The table below works the Mifflin-St Jeor equation through at all five standard activity multipliers (Mifflin et al. 1990), so you can see what a more or less active week does to the numbers:

Activity level Multiplier Maintenance (TDEE) Cutting target
Sedentary 1.2 1656 kcal 1200 kcal
Lightly active 1.375 1898 kcal 1398 kcal
Moderately active 1.55 2139 kcal 1639 kcal
Very active 1.725 2381 kcal 1881 kcal
Extremely active 1.9 2622 kcal 2122 kcal

Two things stand out. First, the sedentary cutting target is the lowest on the table, and for this age band it still sits above the 1200 kcal safety floor — but only just, which is why activity matters so much on a cut: moving more buys calories back. Second, the gap between activity levels is worth hundreds of calories a day, which is why two people with the same weight and the same goal can have very different macro tables.

The goal changes the split as well as the calories. For the same 67 kg woman, the same low-carb style gives:

Goal Calories Protein Carbs Fat
Cutting 1639 kcal 121 g 84 g 91 g
Maintenance 2139 kcal 107 g 106 g 143 g
Bulking 2539 kcal 134 g 125 g 167 g

Maintenance uses 1.6 g/kg of protein and bulking uses 2.0 g/kg, both inside the published 1.6–2.2 g/kg range. The cutting row is the one this page is about; the other two are shown so the trade-off is visible — a cut is not a different diet, it is the same diet with fewer calories.

What a day of eating looks like

Split across four meals, the daily targets divide roughly as follows. These are illustrative portions for a woman eating 1639 kcal — adjust the foods to your own preferences, allergies and budget, and keep the totals, not the specific dishes.

Meal Protein Carbs Fat
Breakfast 31 g 21 g 23 g
Lunch 30 g 21 g 23 g
Dinner 30 g 21 g 23 g
Snack / post-training 30 g 21 g 22 g

In practice, an even split across meals is a starting point rather than a rule. Many people prefer a larger dinner and a lighter breakfast, or a bigger post-training meal, and that is fine — the daily total is what drives the result, not the per-meal symmetry. Two things do matter at the meal level, though. First, spreading protein across three to five meals of roughly 25–50 g each uses it better than eating most of it in one sitting. Second, the meal after training is the one worth planning properly, with protein and carbohydrate together, rather than leaving it to chance.

Foods that make these numbers easy to hit: for protein, eggs, chicken, fish, Greek yoghurt and cottage cheese; for the carbohydrate allowance, non-starchy vegetables, berries and small portions of oats or beans — fibre lives here, and it is worth protecting. Fat comes from olive oil, nuts, seeds, avocado and oily fish. Bread, rice, pasta and potatoes are not banned, but at 20% of calories they are measured portions, not the base of the plate.

How to use the result, and when to adjust it

Follow this split for two to three weeks and track your weight, then judge it by the trend, not by a single weigh-in. For cutting, success looks like aiming for roughly 0.5 kg of fat loss a week, which is the safe rate of 0.5–1% of body weight per week. A 500 kcal daily deficit adds up to 3,500 kcal a week, which is roughly 0.45 kg of body fat (a kilogram of body fat stores about 7,700 kcal). Weigh yourself at the same time of day, in the same conditions, several times a week, and look at the weekly average — daily weight moves by a kilogram or more with water, food and glycogen, and none of that is fat.

If the trend is not moving after three weeks, change one thing by a small amount: adjust calories by 100–200 kcal a day and hold the new level for another two weeks. Do not change the calories, the protein and the training all at once, because then you will not know which change did the work. And do not chase the scale daily — the trend over three weeks is the measurement; a single morning's number is noise.

At 32, the early thirties are the age band where a cutting plan stops being a short project and starts being a system. Careers, relationships and often young children compress the day, and the calories that used to disappear into an active lifestyle now need to be accounted for. Muscle is still very keepable, but only if resistance training stays in the week — the macros supply the material and the training supplies the signal, and neither works well without the other.

For women, two nutrients deserve attention beyond the macros: iron, because monthly losses make deficiency common, and calcium with vitamin D, because bone density is built — or lost — over decades. Resistance training two to four times a week is the other half of the plan for this age band: the macros supply the material, the training supplies the signal, and neither works well without the other.

If you are cutting and you train, keep the protein where it is and adjust carbohydrate and fat first when calories need to change. Cutting protein to save calories is the most common mistake in a diet, because it is muscle that gets lost alongside the fat. The protein figure of 121 g is the floor of this plan, not a negotiable extra.

What the macro numbers do NOT tell you

A macro split is an estimate built on an estimate. The Mifflin-St Jeor equation predicts basal metabolic rate for a population average, and any individual can sit 10–15% above or below it. The activity multiplier of 1.55 is a broad band, not a measurement — two people who both describe themselves as "moderately active" can burn very different amounts in a day. That is why the page tells you to track the weight trend and adjust, rather than treating 1639 kcal as a precise prescription.

The split also says nothing about micronutrients, fibre, or food quality. It is entirely possible to hit 121 g of protein, 84 g of carbohydrate and 91 g of fat while eating almost no vegetables, almost no fibre, and far too much salt and added sugar. The numbers are a calorie framework, not a complete diet. A useful rule of thumb alongside them: aim for at least 25–30 g of fibre a day and a plate that is half vegetables at lunch and dinner, and the micronutrient side of the diet largely takes care of itself.

The split also cannot account for medical conditions. Kidney disease changes the protein answer — people with reduced kidney function should not follow a high-protein target without a clinician's guidance. Diabetes changes the carbohydrate answer. A thyroid condition, certain medications, pregnancy and breastfeeding all change the calorie answer. This page is a general-purpose estimate for a healthy adult; if any of those apply, the numbers here are a starting point for a conversation with a professional, not a plan to follow alone.

Finally, the split does not measure adherence. The best macro ratio in the world is worthless if the diet is miserable enough to abandon in a fortnight. A low-carb split that you can sustain for months beats a theoretically perfect split that lasts a week. If this split feels unworkable — if the carbohydrate cap makes training feel flat, or meals feel joyless without bread and rice — move to a balanced split at the same calories and protein, rather than abandoning the plan altogether.

Frequently asked questions

How many calories should a woman aged 30–34 eat for cutting?

On the assumptions used here (67 kg, 165 cm, moderately active), the estimate is 1639 kcal a day — a basal metabolic rate of 1380 kcal times the 1.55 activity multiplier, giving a maintenance level of 2139 kcal, minus a 500 kcal deficit. Your own figure will differ with your weight, height and activity; use the Macro Calculator with your own numbers.

How much protein is 121 g a day in real food?

About four servings of 31–31 g of protein — for example, a chicken breast (about 30 g), a pot of Greek yoghurt (about 20 g), two eggs with beans (about 20 g) and a portion of lentils or fish (about 25 g), adjusted to reach 121 g across the day. The point of the per-meal table above is that 121 g sounds like a lot as one number and is very manageable split across four meals.

Is 50% fat too much on a low-carb diet?

Fat is not the enemy of a cutting diet — total calories are what decide the outcome, and on a low-carb split fat is deliberately the main energy source. At 91 g of fat a day, this split keeps fat at 50% of calories, which is well within normal dietary ranges, and fat is what keeps meals satisfying and carries the fat-soluble vitamins. What matters is that the total stays at 1639 kcal and the protein stays at 121 g; the balance between carbohydrate and fat is largely a matter of preference and training demands.

Should I count macros every day?

Counting is most useful as a learning tool. Two to four weeks of tracking teaches you what 121 g of protein and 84 g of carbohydrate actually look like on a plate, and after that many people can eat to the same pattern without weighing everything. If tracking becomes stressful or obsessive, stop — the numbers are a tool, not a test, and a relaxed eater who roughly follows the pattern will outperform a stressed eater who tracks perfectly for a month and then quits.

Why is the protein target 1.8 g/kg instead of 0.8 g/kg?

The 0.8 g/kg figure is the minimum to avoid deficiency in a sedentary adult, not the amount that best supports training and cutting. The published evidence for active people (Morton et al. 2018) supports 1.6–2.2 g/kg for lifters and dieters, and this page uses 1.8 g/kg — inside that range. One exception: kidney disease changes the answer, so anyone with reduced kidney function should check with a clinician before following a high-protein target.

What if my weight does not change after three weeks on 1639 kcal?

First, check the trend rather than a single weigh-in — daily weight fluctuates by a kilogram or more. If the three-week average is genuinely flat, adjust calories by 100–200 kcal in the direction of your goal (down if cutting, up if bulking) and hold for another two weeks before judging again. Also check the quiet calorie leaks: cooking oil, drinks, sauces and snacks are the usual reason a careful-looking diet is not actually at 1639 kcal.

Related pages

Estimates only, not medical advice. Minimum safe intakes: 1,200 kcal/day women, 1,500 kcal/day men — consult a healthcare professional before a very-low-calorie diet.