Prices updated daily — 3 June 2026
Product type overview
mashed potato sits within Frozen Vegetables & Fruit, part of Frozen. On this page you compare 8 products from 6 UK supermarkets: Tesco, Sainsbury's, ASDA, Aldi, Morrisons and Waitrose. The lowest unit price for mashed potato is £1.70/kg at Aldi. In total, 2 variants of mashed potato are compared (different pack sizes and compositions). All prices are normalised to the same unit (per kilogram, per litre or per piece) so that packs of different sizes can be compared fairly — a larger pack is not automatically the best value. The ranking below shows, per variant, which supermarket currently has the sharpest price, including own-label products alongside national brands. Prices refresh daily from the retailers' own public price lists, so you never see stale offers when planning your weekly shop. Allsupers uses no affiliate links or paid placement; the ranking is purely price-based and updated from public data.
Cheapest mashed potato
Compare 8 products across 6 supermarkets
mashed potato — compare prices across 6 supermarkets

FOUR SEASONS
Mashed Potato
700 g
£1.70/kg
at 1 supermarket

ASDA
ASDA Smooth Mashed Potato 900g
900 g
£2.11/kg
at 1 supermarket

Sainsbury's
Sainsbury's Mashed Potato 900g
900 g
£2.22/kg
at 1 supermarket

Waitrose Ltd
Waitrose Frozen Mashed Potato
700 g
£2.64/kg
at 1 supermarket

Sainsbury's
Sainsbury's Mature Cheddar Mash, Taste the Difference 600g
600 g
£4.58/kg
at 1 supermarket

McCain
McCain Smiles Made with Real Potato Mash 650g
650 g
£5.00/kg
at 1 supermarket

Sainsbury's
Sainsbury's Cheddar Mashed Potato 400g
400 g
£5.62/kg
at 1 supermarket

ASDA
ASDA Buttery Carrot & Swede Mash 500g
500 g
£6.26/kg
at 1 supermarket