Are larger mass gainer bags better value?

Usually, but not always. Discounts and flavour availability can make smaller bags better value at certain times.

Should I compare mass gainers by protein or calories?

Use both. Mass gainers are bought for calories, but protein content and price per 100g still affect value.

•Compare all UK protein powder prices in one place•

Large bags make headline prices hard to compare. Judge current deals by size, serving data and price per 100g.

Live prices81 products5 retailersUpdated 4 Jun 2026

Planner

How much protein do you want per day from powders?

Protein target

g / day

Loading comparison table