Is 1,800 calories good for weight loss?

For many adults, yes — 1,800 is a moderate intake that clears the common safe floors yet still sits below the maintenance of most average-sized and active people, so it opens a workable deficit. Someone maintaining at 2,300 has a 500-calorie gap at 1,800, about 1 lb a week. It tends to be more sustainable than very low plans because there is enough food to keep hunger and energy in check. Whether it works for you still depends on your own maintenance.

Calorie & Deficit Planner

How Much Weight Will I Lose on 1,800 Calories a Day?

Your loss is the gap between 1,800 and your maintenance calories. Enter your details below to see your own weekly rate and build a plan.

Weight Loss Calculator

Gender

Required: we use your biological sex to estimate your maintenance calories with the Mifflin-St Jeor equation, and to set a safe minimum-intake floor.

Age (years)

Range: 15–100 years

Weight (kg)

Range: 30–300 kg

Height

cmft·in

Enter your height in centimeters (e.g., 170 cm)

Range: 100–250 cm

Activity Level

Daily calories you’ll eat

Enter the calories you plan to eat each day. We’ll measure that against your maintenance and show how fast you’d lose at that intake.

Goal weight (kg) (optional)

Add a target and we’ll estimate how many weeks it takes at your chosen pace.

Known maintenance calories (optional)

Already know your maintenance (TDEE)? Enter it to skip the estimate — age, height and activity aren’t needed then.

Don't know your maintenance? Calculate your TDEE free

*This calculator is for informational purposes only. Please consult a healthcare professional before making any health decisions. See our medical disclaimer for more information.

Quick Answer

How Much Weight Will I Lose on 1,800 Calories a Day?

Your weekly loss is (your maintenance − 1,800) ÷ 3,500. Maintain at 2,300 and the 500-calorie gap is about 1 lb a week; maintain at 2,800 and the 1,000-calorie gap is around 2 lb a week. If you maintain near 1,900 the gap is small and loss is slow. Enter your details below to find your own gap.

1,800 Minus Your Maintenance

Eating 1,800 calories tells you the plate; your maintenance tells you the loss. A pound of fat is about 3,500 calories, so weekly loss is the daily gap between 1,800 and your maintenance, times seven, divided by 3,500. Maintain at 2,300 and the gap is 500 a day — roughly a pound a week, or about four pounds a month. Maintain at 2,800 and the gap is 1,000 a day, closer to two pounds a week. Someone whose maintenance is only around 1,900 has just a 100-calorie gap, so their loss is very slow on the same 1,800. To turn that daily gap into food you can build a day around, the TDEE Calculator gives you the maintenance figure the whole sum needs.

A Moderate, Liveable Intake

Part of what makes 1,800 appealing is that it clears the common safe floors — about 1,200 calories for women and 1,500 for men — with room to spare. That means enough food to keep protein high, hunger in check and energy steady, which is exactly what makes a deficit last. It is firm enough to matter for most average-sized and active people, yet not so low that it feels like deprivation. To split 1,800 into protein, carbs and fat so it stays satisfying, hand it to the Macro Calculator.

Work Out Your Gap

To make 1,800 concrete for you, estimate your maintenance and subtract 1,800. A positive result is your daily deficit; times seven, divided by 3,500, gives your weekly pounds. A moderately active person around 2,300 maintenance lands near a pound a week — a comfortable pace. Someone maintaining close to 1,800 sees little movement and might do better opening the gap a touch with activity rather than eating lower. The Calorie Deficit Calculator sizes the gap for a chosen pace if you would rather work back from a target rate.

See Your Projection

To see where 1,800 sits for you, enter your weight, height, age, gender and activity level and the Weight Loss Calculator below — set to 1,800 calories a day — estimates your maintenance and shows how fast you’d lose eating 1,800: your weekly and monthly loss and the deficit behind it. If your maintenance is high, 1,800 may be a faster cut than you expected; if it is close to 1,800, the tool shows the loss slowing to a crawl. These figures are general estimates for healthy adults, not medical advice.

Estimates use maintenance from the Mifflin-St Jeor equation (1990) and the energy model of body fat (Hall et al., 2011) — about 3,500 kcal per pound. A safe pace is 0.5–2 lb (0.25–1 kg) per week with a daily deficit up to about 1,000 kcal (NHS). Early loss includes water and glycogen; individual results vary.

CDC Assessment Guide