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Card class: Hero • Category: Shipping & Courier

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At a glance

Average label cost per shipment, pooled across every UK sub-carrier ShipTheory’s rate-shop selected (Royal Mail, DPD, Evri, Parcelforce, Yodel etc.). ShipTheory’s value-add is rate-shopping; the cost-per-shipment moves with sub-carrier mix as well as carrier rate movements. A swing in this number usually means the rate-shop ruleset shifted volume, not that a carrier raised prices.
What it countsSUM(label_cost) / COUNT(shipments) for shipments in the window. Cost includes base rate + fuel surcharge + service surcharges (signature, residential, oversize). Excludes 3PL handling fees and ShipTheory subscription fees.
API endpointGET /shipments (ShipTheory v1 REST) joined with GET /labels for cost data. Reads label_cost, currency, sub_carrier, service, weight, dimensions, recipient_postcode_zone.
CurrencyGBP for the UK-focused account; multi-region merchants see workspace base currency with FX at label-creation.
Service level scopeAll sub-carriers and services pooled. Per-carrier breakdown lives in Cost by Zone and Sub-Carrier Volume Mix.
Returns / RTOOutbound only. Returns Easy Print labels and RTO charges separated.
Mix-vs-rate sensitivityCost dominated by sub-carrier mix. A swing from 50% Evri / 30% Royal Mail / 20% DPD to 30% Evri / 50% Royal Mail / 20% DPD lifts avg cost 8 to 15 percent without any carrier raising rates.
3PL handling fees excludedIf your warehouse is a 3PL using ShipTheory, the warehouse’s per-pick handling fee (typically GBP 0.50 to 1.50 per parcel) is not in this number. The 3PL invoices that separately. True landed cost = this card + 3PL handling.
OutliersHeavy / oversize parcels distort the mean; trim-mean variant in Cost Per Shipment Trend.
Time window30D vsP (rolling 30 days, period-over-period)
Alert trigger+10% vsP. Tripped when 30D avg exceeds prior 30D avg by more than 10 percent.
Rolesowner, finance, operations

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Calculation

Calculated automatically from your ShipTheory data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.

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Worked example

The UK home & garden merchant. Reading taken at 09:00 GMT on 12 Mar 26 for the trailing 30 days vs the prior 30 days.
PeriodShipmentsTotal label spendAvg label costSub-carrier mix
Current 30D (10 Feb to 11 Mar)14,800GBP 62,800GBP 4.24RM 44%, Evri 20%, DPD 19%, Parcelforce 8%, Yodel 9%
Prior 30D (11 Jan to 9 Feb)13,200GBP 50,200GBP 3.80RM 38%, Evri 30%, DPD 18%, Parcelforce 7%, Yodel 7%
Change+12.1%+25.1%+11.6%RM up 6pp, Evri down 10pp
The card reads GBP 4.24; the alert at +10% vsP is firing at +11.6%. Five things to notice:
  1. Cost rose because rate-shop shifted volume from Evri to Royal Mail Tracked. This was a deliberate operations decision in early February to reduce late-shipment count (Evri 9.8% late vs Royal Mail 4.8%). The cost lifted GBP 0.44 per parcel (~ GBP 7,000 per month) but the late count and customer-complaint volume both dropped. The trade is intentional.
  2. The +11.6% trip is a pre-planned alert. The operator should already know this is happening (they made the rate-shop change). The card confirms the cost impact is in line with forecast; no firefight needed.
  3. Total spend +25.1% on +12.1% volume. Half is volume, half is mix. Finance forecasting must split.
  4. DPD held at 19% on premium SLA parcels. DPD is the structural high-cost carrier; their share holds at the high-value slice regardless of overall mix shift. If DPD share drops materially, premium SLA shipments are being mis-routed.
  5. Yodel up to 9% from 7%. Small share but rising. Worth checking whether Yodel’s rate-shop wins are concentrating on a specific weight band or postcode area; if so, whether the per-parcel cost saving justifies the OTD risk (Yodel was at 11.7% late in the late-shipment example).

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Sibling cards merchants should reference together

Avg cost is one number; mix and rate movements behind it are several.
CardWhy pair it with Avg Shipping CostWhat the combination tells you
Cost Per Shipment TrendThe 90-day shape.Slope = sustained mix shift or carrier escalation. Step changes = carrier rate-card updates.
Sub-Carrier Volume MixThe mix that drives the cost average.Mix shifts here typically map 1:1 to cost change.
Cost by ZoneZone breakdown.Identifies which lane is dragging. UK Highlands & Islands lane structurally 2 to 3x mainland UK.
High-Cost Shipment OutliersSurfaces oversize / overweight shipments.Outlier rise pulls mean up; consider median in addition.
Late ShipmentsTrade-off counterpart.Operators frequently buy down lates by raising avg cost (rate-shop more to Royal Mail/DPD); both cards must be read together.
Sub-Carrier OTD ComparisonPer-carrier reliability vs cost.Direct evidence for rate-shop ruleset tuning.
Cross-connector: shopify.aovMargin sensitivity.Avg cost / AOV ratio is the operative finance question. >12% of AOV is structurally hard to absorb.
Cross-connector: bigcommerce.aovSame as Shopify for BC merchants.Same caveat.

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Reconciling against the vendor’s own dashboard

Where to look in ShipTheory’s own dashboard: ShipTheory Dashboard → Reports → Spend → Average Cost. The portal shows the same number with sub-carrier breakdown and zone breakdown. Closest like-for-like: Last 30 Days, All Carriers, All Services, GBP. Why our number may legitimately differ from ShipTheory’s portal:
ReasonDirectionWhy
Carrier-invoice reconciliationOurs can drift slightlyCard reads label_cost from the rate quote at label time. Carrier invoices sometimes adjust for actual weight (dimensional reweigh) or fuel-surcharge corrections. Variance typically <1.5%.
Surcharge attributionOurs sometimes lowerSome surcharges (residential, signature) post separately to the invoice; not always passed through ShipTheory’s API. The card can understate by 2 to 4% for surcharge-heavy mixes.
3PL handling fees excludedBoth excludeThe 3PL pick-pack fee is invoiced separately.
Returns labels excludedBoth exclude in this cardReturns Easy Print is tracked separately.
TimezoneBoundary days offCard UTC; portal GMT/BST.
Cross-connector reconciliation:
CardExpected relationshipWhat causes legitimate divergence
shopify.aovMargin denominator.AOV moves with promos.
Stripe / payment-processor net revenueDownstream truth on revenue side.FX, refunds, processor fees.
Direct carrier invoicesSource-of-truth on actual cost.Card vs invoice should reconcile within 1%.

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Known limitations / merchant FAQs

Why does my avg cost change when no carrier raised rates? Sub-carrier mix shift. ShipTheory’s rate-shop ruleset picks the cheapest qualifying carrier per shipment; mix moves week-on-week as customer geography and basket composition shift. Read Sub-Carrier Volume Mix; cost change here typically maps 1:1 to mix change. My carrier raised rates and the card is flat. Why? Three reasons. (1) Rate change applied to a service tier you do not use heavily. (2) Your rate-shop ruleset auto-shifted to a cheaper carrier. (3) Rate change posts to next monthly invoice but ShipTheory’s quoted rate updated; card is forward-looking and matches next invoice. UK Highlands & Islands surcharges, how do they show? Most UK carriers add a surcharge for HD/HS/IV/KW/PA/PH postcodes plus offshore (IM, JE, GG). Surcharges are included in the card’s avg cost. If your customer geography expanded into these zones, expect a structural lift even with no rate or mix change. 3PL handling fees aren’t in this number, where are they? 3PL invoices the merchant separately for pick-pack-handle. Most 3PLs charge GBP 0.50 to 1.50 per parcel. True landed cost = this card + 3PL handling fee per parcel. Build a separate model for finance reporting. Why is my avg cost rising during peak? UK carriers impose peak surcharges November to January (typically GBP 0.20 to 0.50 per parcel across DPD, Evri, Royal Mail). Your rate-shop still picks the same carriers; per-label cost is structurally higher. Plan budgets accordingly. Should I switch to a single-carrier setup? Trade-off. ShipTheory’s value is the rate-shop dynamic; the volatility is the cost of optimisation. Single-carrier accounts are stable but typically higher absolute cost. Decision depends on margin sensitivity vs forecast simplicity. Royal Mail OBA vs ShipTheory rate-shop, which is cheaper? Generally ShipTheory rate-shop wins for variable mix. Royal Mail OBA is competitive at high volume on Royal Mail-heavy mix; if your account is 90%+ Royal Mail, OBA direct can save 5 to 10%. Test the breakeven against your specific weight-and-zone distribution. Cross-border (UK to EU post-Brexit), does that affect this card? Yes. Cross-border shipments carry customs declaration fees (DDP processing fee) plus higher base rates. If your EU export volume is rising, expect a structural lift in this card. Customs duty itself (paid by recipient or merchant separately) is not in the card; net true landed cost is higher. Why does the portal sometimes show different number? Filter state. ShipTheory portal applies workspace defaults that may exclude returns or include 3PL handling differently. Set portal to All Outbound, All Carriers, All Services, Last 30 Days, GBP. Persistent gap >2% = check connector health. How do I plan for next year’s carrier negotiation? Read 90 to 180 day cost trend (Cost Per Shipment Trend). Mix-vs-rate split tells you which carriers to prioritise. Carriers with stable rate cards but rising volume share are leverage points; carriers with declining volume are renegotiation targets.

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Tracked live in Vortex IQ Nerve Centre

Avg Shipping Cost is one of hundreds of KPI pulses Vortex IQ tracks across ShipTheory and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. Start for free or book a demo to see this metric running on your own data.