| Scenario | Orders/mo | Items/order | Avg ship/order | Storage cuft | Est. all-in cost/order |
|---|---|---|---|---|---|
| Starter brand | 400 | 1.4 | $4.80 | 420 | $7.90 – $10.30 |
| Growing catalog | 1,200 | 1.6 | $4.25 | 950 | $6.40 – $9.10 |
| High volume | 6,000 | 1.9 | $3.95 | 3,500 | $5.10 – $7.40 |
- Estimated items per month =
orders × avg_items - Receiving =
pallets×rate+cartons×rate+units×rate - Storage =
cuft×rate+pallet_positions×rate+bins×rate, then applymax(storage, minimum) - Fulfillment =
orders×base_fee+items×per_item_fee+orders×insert_fee+giftwrap_orders×giftwrap_fee, then applymax(fulfillment, minimum) - Packaging =
orders×pack_per_order+items×pack_per_item - Returns =
round(orders×return_rate)×(processing + restock) - Fixed fees = account + software + support + other +
inventory_value×insurance_pct - Shipping =
orders×avg_ship+ surcharge_percent × shipping - Tax = taxable_base × tax_rate, with optional shipping taxation
- Grand total = subtotal + tax, plus per-order and per-item averages
- Enter your orders per month and average items per order.
- Turn on only the sections that match your 3PL agreement.
- Fill in rates exactly as quoted, including minimum monthly fees.
- Keep shipping enabled if you want an all-in cost per order.
- Click Calculate and review the breakdown above.
- Export your results using CSV or PDF.
Order volume drives unit economics
Cost per order improves when fixed fees are spread wider. For example, a $200 platform fee adds $0.50 at 400 orders, but only $0.17 at 1,200 orders. This calculator converts orders and average items into total handled items, so you can see how item-heavy baskets raise per-item labor while keeping shipment count stable.
Pick and pack needs a blended rate
Many contracts quote a base pick fee plus per-item add-ons. If your average basket is 1.6 items, a $2.10 base and $0.45 per item produces a blended fulfillment rate near $2.82 per order before inserts or gift wrap. Compare that figure with your gross margin to confirm the 3PL supports your target contribution.
Storage should follow inventory turns
Storage is usually billed by cubic feet, pallet positions, or bin locations. A rate of $0.65 per cubic foot with 950 cubic feet yields $617.50, but a $150 minimum prevents underutilized accounts from paying too little. Track inventory days on hand and refresh the stored volume monthly to keep this estimate aligned with seasonal stock builds.
Returns and restocking create hidden labor
A 4% return rate on 1,200 orders implies about 48 returns. At $2.50 processing and $0.75 restock, that is $156 in reverse logistics. When return rates spike after promotions, run a second scenario and export the CSV to quantify the impact on net margin and customer-service workload.
Minimums and fixed fees shift break-even
Minimum fulfillment or storage charges can dominate early-stage volumes. If calculated pick-and-pack is $600 but a $900 minimum applies, the extra $300 behaves like a fixed cost. Use the line-item table to spot these adjustments, then test higher volumes to find the order level where real activity fees exceed minimums.
Shipping pass-through needs surcharge control
Carrier postage is often passed through, yet peak and fuel surcharges can add 3% to 15%. With a $4.25 average label cost, a 10% surcharge adds $0.43 per order. Keep shipping enabled for an all-in view, and decide whether to report fulfillment cost with or without carrier charges for internal forecasting.
What costs should I include in a 3PL estimate?
Include inbound receiving, monthly storage, pick and pack, packaging materials, returns handling, kitting, software or account fees, and carrier postage. Add taxes only if your agreement taxes services or shipping in your jurisdiction.
Should shipping be included in cost per order?
Include shipping when you want an all-in fulfillment view. Exclude it when you report warehouse service cost only. This calculator lets you toggle shipping so both reporting styles are easy to compare.
How do minimum fees affect my results?
Minimums act like fixed costs until your activity fees exceed them. When a minimum applies, the calculator adds an adjustment line so you can see how much of your total is driven by the minimum, not real volume.
How do I estimate storage volume?
Start with average cubic feet on hand or average pallet positions from your WMS, supplier, or prior invoices. Update the value monthly, and run separate scenarios for peak season when inventory levels and safety stock increase.
How accurate are return estimates?
Returns vary by channel and product. Use your last 90 days return rate as a baseline, then test higher rates for promotions or holiday gifting. The output shows the cost impact so you can budget conservatively.
Can I compare two 3PLs with this calculator?
Yes. Enter Provider A rates, calculate, then export the CSV. Repeat with Provider B and compare per-order cost, minimum adjustments, and which components dominate. Keep the same order volume and basket size for a fair test.