Calorie Protein Bars

Updated November 5, 2026

100 Calorie Protein Bars: Compare Bars With 100 Calories or Less

The short answer

We found 21 protein bars with 100 calories or less. The list starts with the lowest-calorie bars. Bars with exactly 100 calories are included.

See all 21 bars How we checked the numbers
80–100 calories per bar 6–10g protein per bar 21 bars from 4 brands

All verified bars

Protein bars with 100 calories or less

These are the bars that currently meet our calorie limit. Each item shows nutrition per individual bar and links to a page with its verified source.

21 bars

Filter or sort the bars

Selection standard

Low calorie is not the same as high protein

A bar can be low in calories without having much protein. That is why every table row shows both calories and protein.

Mini and full-size bars are counted as different products. If a label uses two bars as one serving, we check the calories for a single bar. Missing sugar or fiber numbers are shown as unknown—not zero.

Read the complete methodology

Reading the label

Three checks before comparing

  1. 01

    Confirm the serving unit

    Check whether the Nutrition Facts panel describes one bar, two pieces, or another serving size.

  2. 02

    Match the exact variant

    Mini and full-size bars can have different nutrition. Flavor and package size can matter, too.

  3. 03

    Compare protein directly

    Use grams per bar and protein per 100 calories instead of relying on the word “protein” on the package.