At a glance
Average billed cost per Royal Mail consignment, including base postage + fuel surcharges + Saturday surcharge + insurance / declared-value loading + remote-area surcharge. The unit-economics number that pairs with OTD Rate to make the cost-vs-reliability trade.
| What it counts | SUM(consignment_cost) / COUNT(consignments) over the period. Each shipment is weighted equally; the figure is post-discount net of negotiated rate cards. |
| API endpoint | GET /shipping/v3/shipments (Shipping API v3) for shipment-level chargeAmount, supplemented by GET /accounts/v1/billing/invoices (Royal Mail Business Account billing API) for the authoritative monthly invoice reconciliation. |
| Service-tier scope | All Royal Mail services pooled by default (Tracked 24, Tracked 48, Special Delivery, 1st / 2nd class, International Tracked, International Standard / Economy). Per-service breakdown is on Cost by Zone. |
| Tracked vs untracked split | Tracked is more expensive per consignment (Tracked 48 ~£3.40, Tracked 24 ~£4.85, untracked 1st class ~£1.45, untracked 2nd class ~£1.05). The pool average shifts meaningfully with mix; a 10-point swing in tracked share moves the headline by 30 to 50 pence. |
| Return-leg inclusion | Outbound only. Tracked Returns are a separate cost line on the Royal Mail bill (the merchant pays per consumed return label). Reported separately on Cost Trend. |
| Geographic scope | UK domestic + international. International consignments are in destination-country lanes priced separately; international averages 3 to 8x UK domestic per consignment. |
| Surcharges included | Fuel (varies monthly with diesel index), Saturday (£0.30 to £0.50), remote-area (Highlands & Islands +£1.00 to £2.50), oversize / heavy (+£1.00 per kg above standard), declared-value loading. |
| Currency | Stored in GBP (Royal Mail bills in GBP only). Multi-currency stores get GBP regardless. |
| Time window | 30D vsP (rolling 30 days, period-over-period). Daily readings reflect mix-shift, not cost-card change; use the trend view for unit-cost-card change detection. |
| Alert trigger | +10% vsP (avg cost up 10 percent vs prior 30 days). Royal Mail does an annual rate-card uplift in April (typically 2 to 5 percent); fuel surcharge changes monthly; mix-shift can move the number quickly without any rate change. |
| Roles | owner, finance, operations |
Calculation
Calculated automatically from your Royal Mail data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.Worked example
Same UK DTC homewares brand, 60 percent Royal Mail Tracked 48 / 40 percent Evri ParcelShop. Reading at 09:00 BST on 12 Mar 26, trailing 30 days. Royal Mail leg cost breakdown:| Service | Consignments | Avg cost / parcel | Total bill |
|---|---|---|---|
| Tracked 48 (TPN48) | 9,840 | £3.42 | £33,653 |
| Tracked 24 (TPN24) | 1,610 | £4.85 | £7,809 |
| Special Delivery 1pm (SD1) | 280 | £8.10 | £2,268 |
| All RM (this card) | 11,730 | £3.71 | £43,517 |
- The cost-vs-reliability trade is real and quantifiable. Royal Mail Tracked 48 at £3.42 delivers 96.5 percent OTD; Evri ParcelShop at £2.10 delivers 92.5 percent OTD. The merchant accepts a 4-point OTD hit on the Evri half in exchange for a £1.32 / parcel saving (39 percent). For 7,820 Evri consignments that is £10,326 of monthly saving against an additional ~310 late deliveries / month. CFO judgement, not a card recommendation.
- Special Delivery 1pm is 2.4x the Tracked 48 cost but delivers 99 percent OTD. For high-value or fragile shipments, the spread is justified by claim-recovery economics; for everyday parcels it is overkill.
- The “rate suddenly degraded” debug case for cost. Royal Mail’s annual rate-card uplift kicks in 1 April each year, typically a 2 to 4 percent rise. A merchant whose Avg Cost climbs 4 percent on 1 April vs the prior 30 days is seeing the rate-card change, not a mix-shift. A merchant whose cost climbs 8 to 12 percent is also seeing surcharge or zone-mix change. During the CWU strikes of 2022 to 2023 some merchants emergency-uplifted to Special Delivery to maintain service, the avg cost spiked 30 to 50 percent for the affected weeks.
- Fuel surcharge moves monthly. Royal Mail publishes the next month’s surcharge mid-month based on the diesel-price index. A 5p / litre move in diesel translates to roughly 1.5 to 2 percent on the avg cost number. Tracked separately on Cost Trend.
- The £0.30 difference between £3.71 (this card) and £3.42 (Tracked 48 alone) is mix-effect, the Tracked 24 and Special Delivery shares pull the average up. If the merchant rebalances toward more Tracked 48, headline avg cost drops without any negotiation.
Sibling cards merchants should reference together
Avg shipping cost is the unit-economics dial. Pair it with these to make spend decisions:| Card | Why pair it with Avg Shipping Cost | What the combination tells you |
|---|---|---|
| On-Time Delivery Rate | The reliability half of the cost-vs-reliability trade. | Cost-up + OTD-flat = bad value; cost-up + OTD-up = paying for premium tier; cost-down + OTD-down = at the edge of acceptable trade. |
| Cost Per Shipment Trend | The 90-day shape of the same metric. | Step-changes flag rate-card uplifts (April annually) or surcharge moves (monthly fuel index). |
| Cost by Zone | Splits the avg by destination zone. | Highlands & Islands shipments cost 30 to 60 percent more than mainland; if your customer mix shifts north, your avg cost shifts up without any rate change. |
| Shipments by Service | The mix that drives the avg. | A 10-point shift in tracked share moves headline by 30 to 50 pence. Use this to decide whether a cost change is mix-driven or rate-driven. |
| High-Cost Shipment Outliers | The tail of expensive consignments. | If 5 to 10 consignments per week are 3x+ the average (oversize, declared-value loading, remote-area triple-stacked), they pull the avg meaningfully. |
Cross-connector: hermes_evri.her_avg_shipping_cost | The alternative carrier for cost comparison. | Side-by-side comparison is the merchant’s primary lever, the largest cost saving opportunity comes from rebalancing carrier share. |
Cross-connector: shopify.total_shipping | Customer-paid shipping revenue. | Cost vs revenue is the shipping P&L. If avg cost climbs but customer-paid stays flat, margin erodes silently. |
Cross-connector: shipbob.sb_otd_rate | When ShipBob handles warehouse, fulfilment cost lives there separately. | This card is carrier-only spend; pair with ShipBob’s per-pick fee for total fulfilment unit cost. |
Reconciling against the vendor’s own dashboard
Where to look in Royal Mail’s own portal: Royal Mail Click & Drop → Reports → Spend is the small-merchant view. Royal Mail Business Account → Billing & Invoices → Monthly Statement is the authoritative view used for invoice reconciliation; the merchant’s monthly bill is the ground truth. The closest like-for-like view is All Services, Last 30 Days, Outbound Only, Net of Discounts. Why our number may legitimately differ from Royal Mail’s report:| Reason | Direction | Why |
|---|---|---|
| Timezone (BST vs UTC) | Boundary days off | The portal renders dates in UK local; the card uses UTC. Boundary-day shifts move at most 0.5 to 1 percent of monthly spend across the cutover. |
| Tracking-event vs billing event | Either | The card joins shipment-cost from the Shipping API at label-print; the bill aggregates from the billing system at end-of-month sweep. Discounts, credits, and goodwill adjustments applied at month-end may not flow back into per-shipment cost. The bill is the ground truth for finance reconciliation. |
| Service-tier reclassification | Either | If a consignment is reclassified mid-period (under-paid, surcharge added by Royal Mail at sortation), the card uses label-time service code and cost; the bill uses post-sortation final code and cost. |
| Peak-period sampling | Either | December: the bill takes 5 to 10 working days post-month-end to settle; the card always shows label-time cost which is close but not exact. |
Cross-connector reconciliation against hermes_evri.her_avg_shipping_cost | Different population | Different carriers, different rate cards, different surcharge structures. The two cards together inform carrier-mix decisions, neither reconciles to the other. |
| Card | Expected relationship | Causes of legitimate divergence |
|---|---|---|
shopify.total_shipping | Customer-paid shipping revenue. | Free-shipping thresholds, promotional codes, B2B flat-rate billing. |
shipbob.sb_otd_rate | Adjacent fulfilment leg. | Different cost line; ShipBob bills per-pick + per-pack, Royal Mail bills per-consignment. |
Known limitations / merchant FAQs
Royal Mail vs Evri, where is the cost saving? For parcels above 1kg destined to mainland UK home addresses, Evri ParcelShop is typically £0.80 to £1.50 cheaper per consignment than Royal Mail Tracked 48 at the same weight. For sub-500g letterbox-friendly items, Royal Mail’s Large Letter rates beat anything Evri offers. The healthy DTC pattern is to use both: Royal Mail for sub-1kg + letterbox, Evri for chunkier home-delivery. Your CFO will see the saving in thehermes_evri.her_avg_shipping_cost reading; the OTD trade is on hermes_evri.her_otd_rate.
What is the strikes-and-cost playbook?
During the CWU industrial action of Aug 2022 to Apr 2023 some merchants emergency-uplifted to Special Delivery to maintain service; avg cost spiked 30 to 50 percent for affected weeks. The decision was customer-experience driven, not cost-optimal. If a future stoppage hits, expect cost to rise temporarily; budget a 10 to 20 percent cost-headroom for stoppage weeks and reset when service resumes.
Tracked vs untracked, why does adding more untracked drop my avg cost so much?
Untracked is roughly 30 to 60 percent cheaper per consignment than tracked at equivalent weight. A 10-point shift toward untracked drops the headline avg cost by 30 to 50 pence. The hidden cost: untracked OTD is invisible (no scan), Failed Deliveries rises, customer-service WISMO ticket volume increases. Untracked is genuinely cheaper for low-value items where a customer refund on a lost parcel costs less than the year-round tracked premium.
My avg cost climbed 8 percent overnight, what is the playbook?
Ordered. (1) Check the date; if it is 1 April or 1 October, Royal Mail’s annual rate-card uplift may have triggered (uplifts are stepped, not gradual). (2) Check the fuel-surcharge update on the Royal Mail business news page (mid-month each month). (3) Check Shipments by Service for mix-shift, a sudden 5-point jump in tracked share moves headline cost. (4) Check High-Cost Shipment Outliers for one-off oversize consignments. (5) If none of (1) to (4) explain it, query the Business Account billing line items for the affected day to identify the surcharge or zone change.
Why does my Royal Mail avg cost differ from my Click & Drop bill?
The card is shipment-cost-at-label-print; the bill is end-of-month invoice. Differences come from: (1) post-sortation reclassification (Royal Mail under-paid surcharges added at sortation), (2) end-of-month volume rebates and goodwill adjustments not pushed back to shipment-level, (3) credits for returned-to-sender consignments where the sender did not pay full tariff. Reconcile against the official monthly statement for finance purposes; use the card for unit-economics monitoring.
How do I plan for Q4 / Christmas peak?
Royal Mail does not typically apply a peak-season surcharge (unlike DPD, Yodel, or many international carriers); the avg cost stays roughly flat from a per-rate perspective during December. What changes is mix: more Special Delivery, more declared-value loading, more remote-area shipments to home addresses, and more Saturday surcharges. Expect headline avg cost to climb 5 to 12 percent through December driven entirely by mix, not rate.
My merchant runs a free-shipping threshold. How does that interact with this card?
This card measures cost-paid-to-carrier, not shipping-revenue-from-customer. A free-shipping order still costs the merchant £3.42 (or whatever the rate is) to send; that cost is just absorbed in the order margin instead of recovered from the customer. Pair this card with shopify.total_shipping (customer-paid shipping revenue) to see the true shipping P&L; the gap is the merchant’s shipping-subsidy spend.
Why is the Highlands & Islands surcharge separate from the headline?
Royal Mail charges a Highlands & Islands surcharge (£1.00 to £2.50 per consignment depending on service) for ZE, KW, IV, AB, PA postcodes plus Northern Ireland zones for some services. The card pools this surcharge into the avg cost; if your customer mix shifts north your avg cost shifts up without any rate-card change. Use Cost by Zone for the geographic split.