# Scope 1 and 2 Emissions Calculator for Manufacturing Sites

> Source: https://netray.co/tools/scope-1-and-2-emissions-calculator
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Free Tools

## Short answer

Convert natural gas, diesel, refrigerant leaks and purchased electricity into tonnes of CO2e, split by Scope 1 and Scope 2, with intensity per unit produced.

## Category

ehs-workforce

## Industry

Manufacturing

## Audience

- EHS manager
- Sustainability lead
- Plant manager

## Tool

**Kind:** calculator

**Inputs:**

#### Purchased electricity

**Key:** elec_kwh

**Type:** number

**Default:** 1800000

**Min:** 0

**Step:** 10000

**Unit:** kWh

**Help:** Total kWh billed for the reporting period, from utility invoices or the meter.

#### Grid emission factor

**Key:** grid_ef

**Type:** number

**Default:** 0.37

**Min:** 0

**Step:** 0.01

**Unit:** kg CO2e/kWh

**Help:** Location-based factor for your grid region and year. Use your national or regional published figure.

#### Natural gas burned

**Key:** gas_therms

**Type:** number

**Default:** 42000

**Min:** 0

**Step:** 500

**Unit:** therms

**Help:** 1 therm = 100,000 Btu. Convert from m3 or MMBtu first if your bill uses those.

#### Diesel (forklifts, generators, fleet)

**Key:** diesel_gal

**Type:** number

**Default:** 6500

**Min:** 0

**Step:** 100

**Unit:** US gal

**Help:** Fuel purchased or metered for owned or controlled equipment.

#### Refrigerant leaked and recharged

**Key:** refrig_kg

**Type:** number

**Default:** 12

**Min:** 0

**Step:** 1

**Unit:** kg

**Help:** Mass of refrigerant topped up after leaks in chillers and HVAC.

#### Refrigerant GWP (100-year)

**Key:** refrig_gwp

**Type:** number

**Default:** 2088

**Min:** 0

**Step:** 1

**Help:** R-410A is about 2,088 on the AR4 basis. Use the value for your gas and your reporting standard.

#### Units produced in period

**Key:** units

**Type:** number

**Default:** 250000

**Min:** 0

**Step:** 1000

**Unit:** units

**Help:** Any consistent output measure: pieces, kg shipped, machine hours.

**Outputs:**

#### Natural gas emissions

**Key:** gas_t

**Expr:** gas_therms * 5.31 / 1000

**Format:** decimal

**Description:** Uses 5.31 kg CO2 per therm (about 53.06 kg per MMBtu).

#### Diesel emissions

**Key:** diesel_t

**Expr:** diesel_gal * 10.21 / 1000

**Format:** decimal

**Description:** Uses 10.21 kg CO2 per US gallon of diesel.

#### Refrigerant emissions

**Key:** refrig_t

**Expr:** refrig_kg * refrig_gwp / 1000

**Format:** decimal

**Description:** Mass leaked times GWP, in tonnes CO2e.

#### Scope 1 total (tCO2e)

**Key:** scope1

**Expr:** gas_t + diesel_t + refrig_t

**Format:** decimal

**Primary:** true

**Description:** Direct emissions from sources you own or control.

#### Scope 2 location-based (tCO2e)

**Key:** scope2

**Expr:** elec_kwh * grid_ef / 1000

**Format:** decimal

**Primary:** true

**Description:** Indirect emissions from purchased electricity.

#### Scope 1 + 2 total (tCO2e)

**Key:** total

**Expr:** scope1 + scope2

**Format:** decimal

#### Scope 2 share of total

**Key:** scope2_share

**Expr:** if(gt(total,0), scope2 / total * 100, 0)

**Format:** percent

#### Intensity per unit (kg CO2e)

**Key:** per_unit

**Expr:** if(gt(units,0), total * 1000 / units, 0)

**Format:** decimal

**Chart:**

#### Scope 2 emissions vs grid emission factor

**Type:** line

**X:** grid_ef

**From:** 0.05

**To:** 0.9

**Steps:** 24

**Series:**

- scope2
- total

**Disclaimer:** Default factors are rounded US-style figures for estimation. Use the factor set required by your reporting scheme and verify against current published tables before disclosure.

## Content

**Intro:** This calculator turns the three inputs most plants already have, fuel bills, electricity bills and refrigerant service records, into a Scope 1 and Scope 2 inventory in tonnes of CO2e. It follows the GHG Protocol structure so the output drops into a corporate report or a customer questionnaire.

**Sections:**

#### How to use it

**Body:** Enter one reporting period, usually a calendar or fiscal year. Take electricity kWh and natural gas from invoices, diesel from fuel card or tank logs, and refrigerant from service tickets showing kilograms added. Change the grid factor to the one for your region and year, then read the Scope 1 and Scope 2 tiles. The intensity line divides total emissions by units produced so you can compare months or plants of different size.

**Bullets:**

- Use the same period for every input
- Convert gas bills to therms before entering
- Refrigerant counts only what was topped up after leaks
- Leave a field at zero if the source does not exist on site

#### The method behind it

**Body:** Scope 1 is activity data multiplied by an emission factor: fuel quantity times kg CO2 per unit, plus refrigerant mass times global warming potential. Scope 2 location-based is purchased kWh times the average grid factor for where you consume it. Market-based Scope 2 uses supplier-specific or contractual factors, such as renewable energy certificates, and is reported alongside the location-based number under the GHG Protocol Scope 2 Guidance. This tool shows the location-based figure.

#### Reading the result

**Body:** In a typical machining or assembly plant electricity dominates, so Scope 2 is often the larger share, while a foundry or heat-treat shop leans toward Scope 1 from gas. The chart shows how sensitive Scope 2 is to the grid factor, which is why a switch to a cleaner supply moves the total more than most efficiency projects. Track the intensity per unit over time, since absolute tonnes fall when volume falls.

#### Common mistakes

**Body:** The usual errors are mixing fiscal and calendar periods, using a national average factor for a site on a very different grid, forgetting company vehicles and propane, and ignoring fugitive refrigerant. Another is double counting a fuel bought by a landlord. Document the factor source and year in your inventory so an auditor or customer can reproduce it.

**Cta:** If your fuel and meter data already sit in the ERP or a maintenance system, Netray can build a read-only report that pulls them straight into this kind of inventory, with the query shown for review.

**Faq:**

#### What is the difference between Scope 1 and Scope 2?

**Answer:** Scope 1 covers direct emissions from sources you own or control, such as boilers, furnaces, fleet vehicles and refrigerant leaks. Scope 2 covers indirect emissions from the electricity, steam, heat or cooling you purchase. Both are mandatory in a GHG Protocol corporate inventory.

#### Which grid emission factor should I use?

**Answer:** Use the location-based factor published for your grid region and the same year as your consumption, for example the national grid average or a regional figure. If you buy renewable certificates, also report a market-based figure with the supplier or certificate factor.

#### Do I count refrigerant even for small leaks?

**Answer:** Yes. Refrigerants have high global warming potential, so a few kilograms can matter. Count the mass you had to add back to systems after leaks, by gas type, and multiply by the GWP your reporting scheme requires.

#### Is this enough for formal reporting?

**Answer:** It is a sound estimate and a good structure. For audited disclosure you also need documented boundaries, factor sources, other gases such as methane and nitrous oxide from combustion, and often third-party verification.

## Search terms

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