Postage Tier Price Builder is a free online tool that builds a price table by postage weight tier, with product price plus postage per tier. It runs entirely in your browser, so you do not need to install anything, create an account, or share your business details with anyone. You open the page, type in your own figures, and get a clear price or table in seconds. Small sellers often work these prices out by hand, and this tool replaces that slow work with a simple form you can reuse for every product.
It is made for online sellers who ship by weight. If you sell products, run a small shop, teach a class, or make things by hand, you already know that a clear price protects both sides. A buyer who sees how a price is built is more likely to trust it. A seller who knows the cost behind each price knows which products make money and which ones only look busy. This tool keeps those facts visible and written down.
You start by entering your product price and the postage cost for each weight tier. Use real figures from your own business where you can, not round guesses. If you are unsure about a figure, use your best careful estimate and then test a slightly worse figure as well. That second test shows you how sensitive your result is. A price that only works when every figure is perfect is a fragile price, and it is better to find that out here than after you have promised a price to a buyer.
Take this worked example: a product priced at $20 with postage of $4 up to 1 kg, $7 up to 2 kg, and $12 up to 5 kg. The tool shows tier totals of $24, $27, and $32. Notice how the answer is not just one number. It breaks the result into its parts, so you can see where each figure comes from. That breakdown is the useful part, because it tells you which input to change if the final result is too high, too low, or simply unfair for your business or your buyer.
The result matters because postage is often where a small shop loses money, because one flat rate rarely fits every weight. Many small sellers look only at the headline figure and forget what sits behind it. A price list can look complete and still miss a product, and a bundle price can look generous and still lose money on one slow item. Reading the full result, not just the headline, is what turns a figure into a decision rather than a hope, and turns a guess into a price you can explain.
A common mistake is charging one flat postage rate for every weight tier. It is easy to make because the mistake feels reasonable at the time. Charging the same price for every size feels simple, and setting a round price feels quick. Both can be true and still cause trouble if the costs underneath do not support them. The tool helps you catch that problem before anyone pays, while it is still cheap to fix.
Test a heavier tier than you expect, so a surprise parcel does not wipe out your margin. This is a practical habit, not a theory. Run the version you want, then run a second version with a tougher input, such as higher costs, fewer buyers, or a shorter season. Compare the two results and ask yourself which one you could live with if the next few weeks are slow. The best plan is often not the kindest or the cheapest one. It is the plan that still works when conditions get harder.
Revisit your prices regularly, not just once a year. Costs change, fees change, and buyers change. A price that worked six months ago may not work today. A quick recheck each time a major figure changes takes a few minutes and keeps the arrangement honest. It is also worth rechecking before a new product starts, a new season begins, or any change to your fees.
There are limits to what a simple tool can do. it uses the postage rates you enter and cannot check a carrier live rate for you. It cannot predict how a buyer will react, how a season will go, or what a tax authority will decide in your case. Those questions need real records and professional advice where the stakes are high. What the tool can do is make sure the price and the arithmetic behind your plan are sound, so that if the price is agreed, the numbers in it are correct.
The figures here are estimates for planning only, not professional financial, legal, or tax advice. Your real prices, costs, fees, and buyer agreements may differ, and you should check important decisions with your own records or a qualified adviser where needed. Used that way, this free tool is a practical helper for everyday small business pricing. Enter honest figures, read the full result, test a few versions, and choose the version that is fair, clear, and easy to explain to everyone involved.
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