Macro Calculator for Women

Get your maintenance calories and your fat loss macros in about 30 seconds. Built by a nutrition coach for women 35 and up, not a man's numbers scaled down.

How this macro calculator works

Most free calculators hide their math. Here is exactly what this one does, so you can check it, repeat it by hand, or compare it against anything else you have been given.

Step 1: your BMR

Your basal metabolic rate is what your body burns keeping you alive at rest. This calculator uses the Mifflin-St Jeor equation, which is the formula most commonly used in clinical practice for estimating resting energy needs. The female version is:

BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) - 161

Step 2: your maintenance calories

BMR gets multiplied by an activity factor to estimate what you actually burn in a normal day, including training, steps, work and fidgeting.

Step 3: the macro split and its guardrails

Calories get divided at roughly 35 percent protein, 37 percent carbohydrate and 28 percent fat, and then four guardrails run so the split never produces something unusable:

• Protein floor: never below 0.9 grams per pound of bodyweight, which protects muscle in a deficit.
• Protein ceiling: capped at 200 grams a day, because past that you are eating protein you cannot use in place of carbs that fuel your training.
• Fat floor: never below 20 percent of calories, which matters for hormone production.
• Carb ceiling: never above 45 percent of calories, with anything left over pushed back into protein.

Step 4: the four fat loss phases

If you pick fat loss, the calculator does not hand you one aggressive number. It builds four phases that step down by about 107 calories each, so you spend 8 to 14 weeks moving into a deficit gradually rather than crashing into one and quitting in week three.

Phase 1 is set at your maintenance calories, and that is deliberate. It is not a rounding error and it is not a wasted phase. Most women land on this page after years of under-eating, and the first job is not a deficit. It is proving you can hit your numbers consistently and letting your body settle at a normal intake. The deficit starts in Phase 2. Skipping the maintenance phase is exactly how women end up back at 1200 calories with a stalled scale six weeks later.

A worked example

A 40 year old woman, 165 pounds, 5 foot 5, training 4 to 5 times a week, gets these numbers from this calculator:

Her BMR comes out at 1419 calories. Phase 1 matches her maintenance exactly, because that is where the plan starts. Notice that she is eating over 1800 calories in the deepest phase. If that number looks high to you, that is the point. Most women land here after years of eating 1200 calories and wondering why nothing moves.

Minimum daily protein by bodyweight

If you take one number away from this page, take this one. Protein is the macro that decides whether the weight you lose is fat or muscle.

Why women over 35 need different numbers

Generic calculators were largely built on research in younger men and then adjusted with a sex constant. That is not the same as accounting for what actually changes in your late thirties and forties.

• You have likely dieted before. Repeated aggressive deficits leave a lot of women maintaining on far fewer calories than a calculator predicts. That is why phase 1 here starts at maintenance instead of a deficit.
• Muscle is the priority, not just weight. Lean mass declines with age unless it is defended, which is why the protein floor and the resistance training assumption are baked in.
• Recovery is the limiter. Sleep, stress and cycle changes affect how much of a deficit you can actually hold, which is the argument for stepping down slowly instead of all at once.
• The exit matters as much as the deficit. Coming out of fat loss without regaining is a plan of its own, not an afterthought.

Common questions

How many macros should a woman eat to lose weight?

It depends on her weight, height, age and training, but for most women 35 and up it lands between 1500 and 2100 calories a day, with protein at 0.9 to 1 gram per pound of bodyweight, fat at 20 to 30 percent of calories and carbs filling the rest. Use the calculator above for your actual numbers rather than a range.

Is 1200 calories a day enough?

For almost every adult woman who lifts, no. 1200 calories is below the resting metabolic rate of most women, which means you are underfeeding the body before you have accounted for a single workout or step. It works briefly, then energy, training performance and adherence fall apart. Nearly every woman who comes to Integrity Nutrition eating 1200 calories needs to eat more before she can lose fat consistently.

What is the difference between maintenance calories and a deficit?

Maintenance calories are what it takes to hold your current weight. A deficit is any intake below that. Fat loss requires a deficit, but the useful question is how big it needs to be, and for most women the answer is smaller than they think. A deficit of 300 to 500 calories is enough to lose fat steadily while still training hard and sleeping well.

How accurate is a macro calculator?

Any calculator, including this one, is an estimate. Formula-based BMR predictions typically land within about 10 percent of measured values for most people, and further off for anyone with a long dieting history. Treat your result as a starting point, run it for two to three weeks, and adjust based on what the scale, your measurements and your energy actually do.

How long should I stay in each phase?

Roughly 2 to 4 weeks per phase, which puts the full four-phase plan at 8 to 14 weeks. Move to the next phase when progress on your current numbers stalls for two consecutive weeks, not on a fixed calendar date. Phase 1 is the exception. It is set at maintenance and you stay there until you can hit your numbers consistently, which for most women is 2 to 4 weeks.

Do I need to hit my macros exactly?

No. Within about 5 grams on protein and 10 grams on carbs and fat is close enough to get the result. Chasing exact numbers is the fastest way to turn a workable plan into an obsession, and obsession is what makes women quit.

What if I am in perimenopause?

The math does not change, but the execution does. Sleep disruption, higher stress load and shifting recovery capacity all make aggressive deficits harder to hold, which is an argument for the gradual step-down rather than a large cut. Protein and resistance training matter more, not less. If symptoms are significant, work with your physician alongside any nutrition plan.

Should I recalculate as I lose weight?

Yes. Recalculate after every 10 to 15 pounds lost, because your maintenance calories drop as you get lighter. This is the step most people skip, and it is why fat loss appears to stop working around month three.

Is this macro calculator free?

Yes. The calculator and your maintenance numbers are free with no email required. Entering your email unlocks the four-phase fat loss breakdown and sends you a copy of your numbers.

Free resources to go with your numbers

• Intro to Macros: the beginner guide to what macros are and how to start tracking them.
• Grocery Store Guide: protein, carb and fat shopping lists so hitting these numbers is a shopping problem, not a willpower problem.
• The High Protein Cookbook: 50 recipes for when you cannot figure out where 160 grams of protein is coming from.
• The Deficit Survival Guide: high volume recipes for staying full in a deficit.
• Fat Loss Resistance Quiz: find out why your body is fighting fat loss in the first place.