ReewildRating Methodology
Overview
Every product receives two ratings: NPM Nutri Rating (nutrition quality) and Carbon Score (environmental impact). Both ratings use an A-E scale where A is best.
NPM Nutri Rating
The NPM Nutri Rating is based on the UK's Nutrient Profile Model (NPM). It assigns a score by balancing less healthy nutrients against healthier ones, then converts the result to an A-E grade.
How It Works
The NPM calculates a score based on:
Less healthy nutrients (increase score):
- Energy, sugar, saturated fat, sodium
Healthier nutrients (decrease score):
- Fibre, protein, fruit/veg/nuts content
Grade Thresholds
| Grade | Food Score | Drink Score | Description |
|---|---|---|---|
| A | ≤ - 6 | ≤ - 3 | Highest nutritional quality |
| B | - 5 to - 1 | - 2 to - 1 | Good nutritional quality |
| C | 0 to 3 | 0 | Average nutritional quality |
| D | 4 to 15 | 1 to 14 | Lower nutritional quality |
| E | ≥ 16 | ≥ 15 | Lowest nutritional quality |
Source: NPM Calculator
Carbon Score
The Carbon Score rates food according to its carbon intensity - carbon emissions per kilogram of food produced. These ratings are aligned with the global food carbon budget of 5 gigatonnes CO₂e per year set by the EAT-Lancet Commission to limit global warming to less than 2°C.
Grade Thresholds
| Grade | Emissions (kg COâ‚‚e/kg) | Description |
|---|---|---|
| A | < 1.81 | Very low impact |
| B | 1.81 - 2.90 | Low impact |
| C | 2.90 - 4.63 | Medium impact |
| D | 4.63 - 7.50 | High impact |
| E | > 7.50 | Very high impact |
A-rated products sit within the planetary boundary for greenhouse gas emissions from food production.
Source: Foodsteps
Product Matching
Products are scored using the Reewild Matching System. When you scan a receipt, AI finds the closest product match in our database and assigns carbon and nutrition ratings.
Match accuracy is displayed on each receipt to indicate confidence level.
How Ratings Affect Points
Both ratings are multiplied together in the points formula:
Points = Price × [(CarbonScore × NutriScore) ÷ 0.75] × RThis means:
- A/A products earn maximum points
- Mixed ratings (e.g., A/C) earn moderate points
- E in either rating = zero points
See Points Calculation for full details.