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Retail store carbon calculator

Turn your shop's electricity bill and inbound delivery runs into kgCO2e — free, with the factor source and licence shown under every result.

Prefer to skip the typing? Upload the bill instead — the numbers get read for you, three documents a day free.

How this calculation works

A physical store's operational footprint is dominated by two things: the electricity that keeps the lights bright and the air-conditioning cold, and the trucks that bring stock to your door. This calculator adds them up:

Emissions (kgCO₂e) = kWh × grid factor + tonne-km × road freight factor

The electricity term is your Scope 2 — for a shopfront in a hot climate, lighting and aircon typically account for most of the meter reading, which is why retail units often out-consume offices of the same size. The freight term is Scope 3 upstream transport: deliveries you pay a carrier to make, measured in tonne-kilometres (the tonnes moved multiplied by the kilometres they travelled).

Neither input requires new instruments. The kWh is on your electricity bill; the tonne-km comes from delivery notes and a map.

The factors behind the numbers

| Activity | Factor | Source | | --- | --- | --- | | Electricity, Singapore (2023 data year) | 0.4085 kgCO₂e/kWh | EMA, Singapore Energy Statistics 2024 | | Electricity, Singapore (2024 data year) | 0.4020 kgCO₂e/kWh | EMA, Singapore Energy Statistics 2025 | | Road freight (all regions) | 0.1153 kgCO₂e/tonne-km | UK DEFRA/DESNZ 2025 |

If your store is outside Singapore, the region selector swaps in the local grid factor: the US uses 0.3712 kgCO₂e/kWh (EPA eGRID 2022) and the UK 0.207 (DEFRA 2025); for the other listed countries we apply figures from Ember's yearly electricity data, verified against Ember's 2023 dataset — approximately 0.61 for Malaysia, 0.68 for Indonesia, 0.55 for Thailand, 0.47 for Vietnam, 0.62 for the Philippines, 0.49 for Japan, 0.58 for China, 0.71 for India, 0.56 for Australia, and a world average of about 0.48. Road freight uses the DEFRA per-tonne-km factor as an international default because most countries don't publish their own.

Every factor is served with its source, data year, and licence printed under your result — EMA data under the Singapore Open Data Licence, DEFRA under the Open Government Licence v3.0, Ember under CC-BY. If a customer or auditor asks where a number came from, the provenance is already on the page.

A worked example

Take a 120 m² fashion outlet, using Singapore's grid factor as one worked case (pick a different region above for your own site), that used 1,500 kWh last month and received four stock deliveries averaging 0.25 tonnes over 200 km each — 200 tonne-km of inbound road freight.

1,500 kWh × 0.4020 kgCO₂e/kWh = 603.0 kgCO₂e

200 tonne-km × 0.1153 kgCO₂e/tonne-km = 23.1 kgCO₂e

Total ≈ 626.1 kgCO₂e ≈ 0.63 tCO₂e for the month

Notice the shape of the result: electricity is roughly 96% of it. That is typical for retail — the cooling and lighting load dwarfs the delivery runs — and it tells you exactly where reduction effort pays off first.

Build the per-square-metre habit

Raw kgCO₂e is hard to compare between a kiosk and a flagship. Divide by floor area and it becomes a benchmark: the store above runs at 626.1 ÷ 120 ≈ 5.2 kgCO₂e per m² per month. Track that figure monthly and it does three useful things — it normalises away store size when you compare outlets, it exposes creeping aircon or lighting waste that a lump-sum number hides, and it gives landlords and franchise partners a metric they can act on. Multi-outlet operators who rank stores by kgCO₂e/m² usually find one or two sites quietly running far above the rest, and those are almost always fixable with maintenance rather than capital spending.

A multi-outlet comparison: same chain, different formats

A retail chain running the per-square-metre benchmark from the previous section across three formats — a 400 m² flagship, a 120 m² high-street unit, and a 60 m² mall kiosk — typically finds the kiosk, not the flagship, sitting highest on a kgCO₂e/m²/month basis. A small footprint with a full-height glass frontage and no back-of-house space to buffer heat gain can run its aircon harder per square metre than a larger store with more interior volume and better-shaded stockrooms. This is the value of the ratio over the raw number: ranked by total kgCO₂e, the flagship looks like the problem; ranked by kgCO₂e/m², the kiosk usually is. A chain that only ever looks at absolute store totals will keep investing maintenance budget in its biggest, most visible site while its least efficient one goes unnoticed.

Common mistakes with retail store accounting

  • Assuming the service charge dollar figure is a usable electricity proxy. Service charges bundle electricity with cleaning, security, and management fees at rates that vary by landlord and lease terms — there is no reliable conversion from a bundled service-charge dollar amount to kWh, so it's worth asking for the sub-metered or apportioned kWh figure directly rather than estimating from the invoice total.
  • Comparing kgCO₂e per store without adjusting for floor area or trading hours. A flagship store will almost always show a bigger raw number than a kiosk purely because it's larger and open longer — that's not evidence of worse performance. The per-square-metre or per-trading- hour ratio is the fairer comparison across a portfolio of different formats.
  • Missing franchise or licensed-store data entirely. Chains that operate a mix of owned and franchised locations sometimes report only the owned-store footprint because franchisee bills aren't centrally collected, which can understate the group total by a large margin depending on the franchise share of the estate.
  • Treating one month's reading as the annual average. Singapore's cooling load and many countries' seasonal heating loads mean a single month, multiplied by twelve, can misstate the year by a meaningful margin in either direction — collect actual monthly bills where the reporting stakes are high enough to matter.

What this calculator doesn't cover

Honesty about limitations is part of the method:

  • Packaging. Carrier bags, boxes, and fillers are Scope 3 purchased goods. They need mass-based factors per material, which this tool doesn't collect. For most stores the tonnage is small, but it isn't zero.
  • The goods you sell. The embodied emissions of your stock are usually the single largest part of a retailer's full value-chain footprint — and they are firmly out of scope here. This calculator gives you a defensible store-operations number, not a product footprint.
  • Refrigerants. Leakage from aircon and chiller units is Scope 1 and can be material for F&B and grocery formats. It needs service records, not a utility bill.
  • Your own vehicles. A company van is Scope 1 fuel — the freight field is only for third-party carriers. Put your own litres through the fleet fuel calculator instead.
  • Market-based electricity. If you buy renewable energy certificates, the market-based Scope 2 adjustment is out of scope; this is the location-based number.

Where this fits in your reporting

Store electricity is Scope 2; inbound freight you pay a carrier for is Scope 3, category 4. Those are the numbers ISSB IFRS S2, GRI 305, and CDP questionnaires ask for, and the calculation is the same whether the storefront belongs to a retail chain, a nonprofit's charity shop, or a public-sector outlet. Retailers feel this indirectly more often than directly: if you franchise from, supply, or lease from a Singapore-listed group, questionnaires asking for your electricity and freight emissions are already circulating. A monthly habit — bill in, number out, filed — is far cheaper than a year-end scramble.

When typing numbers in gets old, upload the bills and delivery notes themselves — three documents a day free with no signup, ten with an email, files auto-deleted after 30 days, and the same sourced factors applied to figures read straight off the PDF.

Sources

Frequently asked questions

Is my store's electricity Scope 1, 2 or 3?
Purchased electricity is Scope 2 — indirect emissions from generation you don't own. Inbound freight you pay a third-party carrier for is Scope 3 (upstream transport). Fuel you burn yourself, like a company van or refrigerant leaks from your own aircon, is Scope 1 and isn't covered by this calculator.
How do I work out tonne-km for my deliveries?
Multiply the weight of each delivery in tonnes by the distance it travelled in kilometres, then add the deliveries up. Four deliveries a month of 0.25 tonnes each over 200 km is 4 x 0.25 x 200 = 200 tonne-km. Supplier delivery notes usually state weight; distance can be estimated from the warehouse postcode.
Why does the calculator ask which country my store is in?
Grid emission factors differ a lot by country. Singapore's official factor is currently 0.4020 kgCO2e/kWh (2024 data year — 0.4085 is the 2023 data year figure, used only for activity dated within 2024), while Malaysia's grid is approximately 0.61 and the UK's is 0.207. Picking your region applies the right electricity factor; the road freight factor is a global default either way.
Does this cover packaging and the products I sell?
No, and we'd rather say so plainly. Carrier bags, boxes and the embodied emissions of the goods on your shelves are Scope 3 categories that need mass- and spend-based data this free tool doesn't collect. For most retailers sold goods are the largest slice of the total footprint — treat this calculator as your store operations number, not your whole value chain.
My landlord bills electricity inside the service charge — what do I enter?
Ask for the kWh attributed to your unit from the sub-meter or the landlord's apportionment. If you only have a dollar figure, an estimate from tariff arithmetic is possible but it's weaker evidence than a metered number, so flag it as an estimate in anything you report.
Does a mall's common-area air-conditioning get apportioned to my store's electricity figure?
Sometimes, and it depends on your tenancy agreement. Some malls sub-meter each unit's own electricity separately from a shared common-area or chiller-plant charge that's billed through the service charge instead. If your service charge includes an apportioned kWh figure for shared cooling, add it to your own sub-meter reading; if the landlord only provides a dollar figure for common areas, ask specifically for the kWh basis before including it.
Should point-of-sale terminals, back-office servers, and security systems be counted separately from the store's general electricity?
No — they draw from the same meter as the lighting and air-conditioning, so their consumption is already inside the total kWh figure on the bill. There's no separate line to add; the electricity figure this calculator asks for already captures every plug load in the store.
How should I handle a store with a big seasonal swing, like a heavier December or a hot-season aircon spike?
The same way as any seasonal business: don't measure one representative month and multiply by twelve, because that either overstates or understates the annual total depending on which month you picked. Sum twelve actual monthly bills, or at minimum blend a peak month and a quiet month, and note in your methodology that consumption is seasonal rather than presenting a flat monthly average as if it were typical.