> A lot of 'premium' branded instant coffee is ~£42/kg. That's £3/kg more than my premium, locally-roasted, single-estate Colombian coffee beans.
You need 7-10 times less instant coffee to make a cup though, so your beans are a lot more expensive in the end. From my experience, cup of coffee is either 2 grams of Nescafe Gold or 16 grams of beans.
The 7-10 times seems quite off. It’s pretty close to 5 times assuming common extraction yields about 20%.
So instead of brewing 16g of coffee you could dissolve 3.2g of instant.
You need 7-10 times less instant coffee to make a cup though, so your beans are a lot more expensive in the end. From my experience, cup of coffee is either 2 grams of Nescafe Gold or 16 grams of beans.