Impact Measurement

This page explains how we calculate and track the metrics that demonstrate the real-world impact of food rescue operations powered by Surplus. Understanding these calculations helps partners, volunteers, funders, and stakeholders see the tangible benefits of preventing food waste and getting nutritious food to those who need it.

Weight tracking

Total weight is the foundation for all other impact calculations. Food is measured in pounds, and weight is recorded at every step — when food is collected from a donor, sorted at a hub, and distributed to a recipient.

What we track:

• Total weight — all food successfully distributed to recipients
• Composted weight — food diverted to composting facilities (trim, waste from sorting)
• Weight by category — breakdown by food type for accurate value and emissions calculations

Only food that has been completed as a distribution (actually handed off to a recipient) counts toward headline impact metrics. Food that was collected but hasn't been distributed yet does not appear in reported numbers — this ensures we only report impact that truly reached communities.

Meals made possible

Meals Made Possible represents the number of meals that can be provided to people in need based on the food we rescue. We use this language carefully — while the food we recover isn't always a complete meal on its own (especially when working with large produce vendors), our partnerships with distribution organizations turn these donations into nourishing meals when combined with other resources.

How we calculate it:

We use the Feeding America standard that 1.2 pounds of food equals one meal.

Total Distributed Weight (lbs) / 1.2 = Meals Made Possible

Example: Rescuing 1,200 pounds of food = approximately 1,000 meals made possible in the community.

Why this matters: This metric translates abstract weight measurements into meaningful human impact — terms that donors, funders, and the public can immediately understand and relate to.

Retail value

Retail Value represents the monetary value of rescued food at typical grocery store prices. Different food types have different retail values per pound, reflecting what communities would pay for this food at a store.

How we calculate it:

Weight by Category (lbs) × Retail Value per lb = Category Retail Value
Sum of all categories = Total Retail Value

Example: 100 pounds of fresh produce = $181 in retail value.

Why this matters: Retail value shows the economic worth of food that would have been wasted, helping donors understand the value of their contributions and helping programs communicate impact to funders.

Sources: Base values from ReFED "U.S. Grocery Retail Dollar-to-Weight Conversion Factors" (2019 Nielsen point-of-sale scanner data), inflation-adjusted annually using USDA ERS Food Price Outlook category-level CPI data through 2026.

Fair market value

Fair Market Value represents the estimated wholesale price of rescued food, used primarily for tax deduction purposes and funder reporting.

How we calculate it:

Based on the Feeding America annual valuation study:

Total Distributed Weight (lbs) × $1.92 = Fair Market Value

The $1.92 per pound flat rate provides a conservative, defensible estimate suitable for tax contexts. Unlike retail value, this does not vary by food category — it represents a blended wholesale baseline.

Why this matters: Fair Market Value provides a conservative estimate appropriate for tax deduction documentation and grant reporting, ensuring compliance with IRS requirements for charitable food donations.

Source: Feeding America annual product valuation study (industry benchmark for charitable food valuation).

Emissions reduction

Emissions Reduction measures the CO₂e (carbon dioxide equivalent) prevented from entering the atmosphere by diverting food from landfills. When food waste ends up in a landfill, it decomposes anaerobically (without oxygen) and produces methane — a greenhouse gas roughly 80 times more potent than CO₂ over a 20-year horizon. By rescuing food before it reaches a landfill, we prevent those emissions entirely.

How we calculate it:

We use the EPA Waste Reduction Model (WARM) Version 16 (December 2023, EPA-530-R-23-018), which provides category-specific landfill emission factors. Each food type generates different amounts of CO₂e based on its composition — high-carbon items like bread produce more landfill emissions per pound than watery produce.

For each food category:
  Weight Diverted from Landfill (lbs) × Category CO₂e Factor = Category Emissions Avoided

Sum of all categories = Total Emissions Reduction (lbs CO₂e)

Example: 500 lbs of bakery items (× 1.09) + 300 lbs of produce (× 0.25) + 200 lbs of dairy (× 0.53) = 545 + 75 + 106 = 726 lbs CO₂e avoided through landfill diversion.

Unit conversion from source data: WARM reports factors in metric tons CO₂ equivalent (MTCO2E) per short ton of waste. We convert to lbs CO₂e per lb using: factor_lbs = MTCO2E × 2,204.6 / 2,000. For example, the "Food Waste (non-meat)" factor of 0.50 MTCO2E/ton becomes 0.55 lbs CO₂e/lb.

Why this matters: Rather than using a single blended number for all food types, this category-based landfill reduction approach gives us a more accurate, defensible picture of environmental impact. A pound of bread diverted from landfill avoids over four times the CO₂e of a pound of produce — our calculations reflect that reality.

Source: EPA WARM v16 — Exhibit 6-17, "Net Landfill GHG Emissions", National Average scenario (December 2023).

Waste cost savings

Waste Cost Savings represents the money saved by diverting food from landfills instead of paying for waste disposal.

How we calculate it:

Based on an average of $0.05 per pound for waste management (including landfill fees, transportation, and processing costs):

Total Weight (lbs) × $0.05 = Waste Cost Savings

Example: 1,000 pounds of rescued food = $50 in waste cost savings.

Why this matters: This metric shows the direct economic benefit to businesses and communities by reducing waste disposal costs — a tangible savings that resonates with donor organizations managing their own waste budgets.

Source: In-house average of waste costs shared by partners.

Food categories

We organize all rescued food into specific categories to ensure accurate impact calculations and proper handling:

• Fresh Produce — fruits, vegetables, herbs
• Dairy Products — milk, cheese, yogurt, butter
• Bakery Items — bread, pastries, baked goods
• Meat and Fish — all proteins, fresh or frozen
• Non-Perishable Items — canned goods, pasta, rice, shelf-stable foods
• Prepared and Frozen Foods — ready-to-eat meals, frozen entrees
• Mixed Items — prepared foods with multiple ingredients
• Other — anything that doesn't fit the above categories

Different food types have different values, nutritional content, emissions profiles, and handling requirements. Categorization ensures accurate retail value and emissions calculations, and supports proper food safety protocols.

Special cases

Compost

Food that goes to composting facilities (trim and waste from sorting operations) counts toward some metrics but not others:

This reflects reality: composted food was still diverted from landfills (environmental benefit) but didn't reach people as meals (human benefit).

Holding partners

Food in holding or staging facilities (intermediate storage before final distribution) does not count toward impact metrics until it reaches a final recipient. This prevents double-counting and ensures reported numbers reflect food that actually reached communities.

Filtering and scoping

The analytics dashboard supports filtering by date range, donor, recipient, hub, and food category. When filters are applied, all metrics recalculate against only the matching records. Unfiltered totals exclude holding partners by default to prevent overstating impact.

Where impact appears in Surplus

• Analytics dashboard — full metrics with filtering for admins
• Impact map — geographic visualization of the food rescue network
• Donor dashboards — impact scoped to each donor's contributions
• Recipient dashboards — impact scoped to what each recipient has received
• Driver views — personal impact for completed routes

Data sources and methodology

Our impact calculations are based on established research and industry standards:

We review and update these calculations as new research becomes available to ensure impact measurements remain accurate and current.

Why impact measurement matters

Accurate impact measurement helps us:

• Demonstrate value to donors and partners considering participation
• Track progress toward mission goals across programs
• Make data-driven decisions about which operations to prioritize
• Communicate clearly to stakeholders, the public, and the media
• Ensure transparency in all reporting and fundraising
• Comply with regulations for tax deductions and grant reporting

Every pound of food rescued, every meal made possible, and every dollar of value preserved represents real impact in fighting food waste and food insecurity.