A typical grilled, skinless chicken breast (about 4–6 ounces or 113–170 g) has roughly 180–280 calories , with most of those calories coming from protein.

Quick Scoop

  • Around 165–170 calories per 100 g of grilled chicken breast.
  • A 3.5 oz (100 g) portion: about 165 calories, 31 g protein, ~3–4 g fat.
  • A 6 oz grilled breast is commonly listed around 280 calories.
  • Very low in carbs (usually 0 g), high in lean protein, and relatively low in fat.

Why Numbers Differ

Calories vary because of:

  1. Portion size
    • 100 g vs 4 oz vs 6 oz servings will all show different numbers.
  1. Cooking method & add‑ons
    • Added oil, marinades, sugary sauces, or skin-on pieces can push a “150 kcal breast” closer to 200–250+ kcal.
  1. Database or brand
    • Some sites list ~153–170 kcal per serving, others ~157–165 per 100 g, but they’re all in the same lean‑protein ballpark.

Handy Rule of Thumb

If you want a practical estimate without a food scale:

  • Small breast (3–4 oz, about palm-size) : ~140–190 kcal.
  • Medium breast (5–6 oz) : ~230–280 kcal.
  • Plain, skinless, lightly oiled grilled chicken breast is one of the go‑to lean protein choices for many fitness and weight‑loss plans.

TL;DR:

  • Most people can log a grilled, skinless chicken breast as about 165 kcal per 100 g or about 250 kcal for a decent‑sized piece , and be close enough for everyday tracking.

Information gathered from public forums or data available on the internet and portrayed here.