Refeed Day Calculator

What a refeed actually does

A refeed is a planned higher calorie day, mostly carbohydrate, dropped into a long fat loss phase. Three things about it hold up well. Glycogen gets topped back up, so the next hard session feels closer to normal instead of flat. A planned high day is far easier to hold to than an unplanned one, because it arrives with a number attached instead of a vague permission slip. And a long deficit is tiring, so having something on the calendar to aim at makes the stretch in front of you feel shorter.

What holds up much less well is the version you see online, where one day of carbohydrates resets a slowed metabolism or sets off some hormonal fireworks. Leptin does rise when you eat more, and it settles back down about as fast. The evidence that a single higher day changes how much fat you lose across a whole diet is thin and mixed, nothing like as confident as the claims made for it. I use refeeds because they help people keep going, not because they do something clever to your physiology.

A worked example

Say you are eating 1,800 calories, you weigh 180 pounds, and you put yourself at 15 percent body fat. The tool assumes maintenance sits about 500 calories above your intake, so 2,300. Fifteen percent lands a man in the middle band, which gets a 1.24 bump, so the refeed day comes out at 2,852 calories. Protein holds at one gram per pound, 180 grams. Fat comes down a little to 0.3 grams per pound, 54 grams. Everything left over goes to carbohydrate, which works out to 412 grams, roughly 304 more than the tool assumes you eat on a normal day. Frequency comes back as once per week.

What the day costs

That refeed sits about 550 calories above maintenance, so it is fair to ask what it does to your week. Six days at 1,800 plus one at 2,852 is 13,652 calories. Seven days at maintenance would be 16,100. Your weekly deficit goes from 3,500 down to about 2,448, which moves the pace from roughly a pound a week to roughly seven tenths of a pound. Not free, then. You are trading a little speed for a diet you are more likely to finish, and that is usually a good trade. Just make it on purpose rather than discovering it later in the deficit math.

Who should skip this

If you have a history of disordered eating, or if higher calorie days reliably turn into days you feel bad about afterwards, a scheduled eating window is the wrong structure for you. That is worth working through with a professional who does that specifically, rather than with a calculator. No judgment in it at all, it is just a different problem than the one this page solves. Nothing here is a reward you earned or a rule you broke, and no food on the list is good or bad.

How to run one well

Put the refeed the day before your hardest training session so the carbohydrate gets used. Keep it to food you recognize, rice, potatoes, oats, fruit, rather than treating it as an open door. Expect the scale to jump a couple of pounds the next morning, because glycogen pulls water with it, and ignore that entirely. Recheck these numbers when your weight has moved about ten pounds, since both your maintenance estimate and your macro split shift with it. And if the honest answer is that you are just tired of dieting, a longer planned break at maintenance, the kind a reverse diet maps out, does more for you than one big day ever will.