How to reduce shipping costs for a small business: 9 practical ways

For most small online stores, shipping is the second biggest cost after the products themselves. The good news: you rarely need a big contract with a carrier to pay less. Most savings come from small, boring improvements that add up on every parcel.

Here are nine ways to cut shipping costs, roughly ordered from the easiest to the most involved.

1. Understand dimensional weight

Carriers do not only charge by weight. For many services they charge by dimensional weight (also called volumetric weight), which is based on the size of the box:

Dimensional weight = length × width × height ÷ a divisor set by the carrier

You pay for whichever is greater: the real weight or the dimensional weight. A common divisor is 139 when measuring in inches and pounds, or 5000 in centimetres and kilograms, but each carrier and service sets its own, so check their current rules.

Example: a light cushion in a 16 × 16 × 8 inch box weighs 2 lb. Its dimensional weight is 16 × 16 × 8 ÷ 139 ≈ 14.7, so it is billed as a 15 lb parcel. The same cushion vacuum-packed in a 12 × 12 × 4 inch box comes to about 4.1, billed as 5 lb.

This single idea explains most “why is this parcel so expensive?” surprises. Our guide on how to calculate dimensional weight has the divisors by carrier and more examples.

2. Right-size your packaging

Once you know how dimensional weight works, the fix is obvious: use the smallest packaging that still protects the product.

• Keep three or four box sizes that match your best-sellers instead of one large “fits everything” box.
• Use padded or poly mailers for soft, unbreakable items such as clothing.
• Replace heavy filler with lighter protection where you safely can.

3. Use free and flat-rate carrier packaging where it fits

Some carriers provide free boxes and envelopes for specific services, and offer flat-rate options where the price does not depend on weight. Flat rate is usually a good deal for small, heavy items going far, and a bad deal for light items going nearby. Compare both for your typical parcels.

4. Compare carriers for every parcel type

No carrier is the cheapest for everything. One may win for light parcels, another for heavy boxes or rural addresses. A shipping tool that shows rates from several carriers side by side makes this a five-second check instead of a research project. Our guide on how to choose shipping software explains what to look for, and the cheapest way to ship packages shows which service usually wins for each parcel type.

5. Get discounted rates without a contract

Retail prices at the post office counter are the highest you can pay. Shipping platforms negotiate volume discounts and pass part of them on to small sellers, and many store platforms include discounted labels too. Run a few of your real orders through each option and compare the totals.

6. Watch for surcharges

The base rate is only part of the bill. Common extras include:

Surcharge	When it applies
Residential delivery	Delivering to a home rather than a business
Fuel	A percentage that changes over time
Additional handling or oversize	Long, heavy or oddly shaped parcels
Address correction	The address was wrong or incomplete
Remote area	Deliveries far from carrier hubs

Two cheap habits remove a lot of these: validate addresses before printing the label, and keep parcels under the carrier’s size limits.

7. Weigh and measure accurately

If you under-declare weight or size, the carrier corrects it later and adds an adjustment fee. If you over-declare, you simply overpay. A small digital scale and a tape measure pay for themselves within weeks. Save the weight and dimensions of each product in your store or shipping tool so nobody has to guess.

8. Rethink who pays for shipping

Lower costs are one side; the other is how you charge the customer.

• Free shipping above a threshold (“free shipping over $50”) encourages larger baskets that absorb the shipping cost.
• Flat-rate shipping is simple to understand and easy to budget for.
• Building shipping into product prices works when your products are similar in size and weight.

Test one change at a time and watch both your conversion rate and your margin.

9. Reduce returns and reshipments

Every parcel that comes back or has to be sent twice doubles your shipping cost. Clear product photos and size charts, sturdy packaging and tracking emails prevent more shipping spend than any discount. Our guide on how to handle returns covers the policy and the process.

Quick checklist

• I know the dimensional weight rules of the carriers I use
• I have box and mailer sizes matched to my best-sellers
• Product weights and sizes are saved in my system
• I compare at least two carriers for each parcel type
• Addresses are validated before labels are printed
• I have reviewed my shipping prices and free-shipping threshold this year