WellByNumbers.

Mayonnaise vs Butter

MayonnaiseButter
Protein · per 100 g0.0 g0.8 g
Carbs · per 100 g0.0 g0.1 g
Fat · per 100 g78.6 g81.1 g
Fiber · per 100 g0.0 g0.0 g
Energy · per 100 g786.0 kcal717.0 kcal
Protein · per 100 kcal0.0 g0.1 g
To hit 30 g protein— · — kcal3529 g · 25306 kcal

The same three numbers, drawn

Protein / 100 g0.00.8Fiber / 100 g0.00.0Protein / 100 kcal0.00.1MayonnaiseButter

What 30 g of protein looks like on a plate

Where the calories come from

fat 100%
0%0%fat 100%
More protein / 100 g: ButterLighter per 100 g: Butter

Swap in your own pair

Bold marks the better side of each row. "Per 100 kcal" answers the density question — which food delivers more protein for the energy it costs. Portion row is computed live from the same USDA base values shown on each food page.