Guides / Cost

What an Injection Mold Costs in Vietnam, and What Changes the Number

September 15, 2026

Tooling is usually the largest single cheque in a molded product project, and it is spent before a single sellable unit exists. It is also the line where buyers comparing quotes most often compare two different things.

Published comparisons put Vietnamese mold shops meaningfully below Western tool rooms and somewhat below China for equivalent work, with a simple single cavity mold commonly quoted in the low thousands of US dollars. Those figures are useful for setting expectations, and useless for budgeting your specific part, because the spread inside any one category is wider than the gap between countries.

What follows is what actually moves the number.

Cavity count

A cavity is one copy of your part in the tool. A four cavity tool makes four parts per shot, so it cuts cycle time per part by roughly four, and it costs substantially more than a single cavity tool, though not four times more.

The decision is arithmetic, not ambition. Work out how many parts you need per month, how long a cycle takes, and how many machine hours that implies. If a single cavity tool covers your volume on one shift, extra cavities buy you nothing but a bigger invoice. If you need three shifts to keep up, more cavities are cheaper than more machine time.

Most first projects are over-tooled. Buyers imagine the volume they hope for, pay for cavities against it and then run the tool at a fraction of capacity for two years.

Steel and rated tool life

Tools are quoted against an expected number of shots. A tool rated for 100,000 shots is built from harder steel, with better cooling and replaceable wear components, than a tool rated for 10,000.

Both are real tools. The mistake is paying for the 500,000 shot tool when your product has not proven it will sell, or buying the 10,000 shot tool for a product you already know ships in volume and then paying again eighteen months later.

Ask for the rated shot life in writing, and ask what happens at the end of it: refurbishment, replacement inserts or a new tool.

Part geometry

Three features drive tool cost more than overall size:

Undercuts. Any feature that would stop the part sliding out of the tool needs a side action or a lifter, each of which is a mechanism inside the tool. Removing a single undercut at design stage can remove a meaningful share of the tooling quote.

Wall thickness and ribs. Uneven walls cause sink marks and warp, which the tool maker solves with cooling design and sometimes with extra gates. A part designed with even walls from the start tools cheaper and cycles faster.

Cosmetic surfaces. A textured or high gloss visible surface adds polishing and texturing work, and it raises the cost of any later modification, because reworking a polished cavity means re-polishing it.

Gating, cooling and the invisible half

Two tools that look identical on a drawing can differ by a large margin because of what you cannot see: the runner system, the gate type, the cooling channels and whether the tool uses a hot runner.

A hot runner removes the sprue and runner waste on every shot. It costs more up front and pays back through material savings and faster cycles at volume. On a low volume part it is usually the wrong choice, and on a high volume part in an expensive resin it can pay for itself faster than buyers expect.

Five questions that make tooling quotes comparable

Send the same five questions to every bidder:

1. How many cavities, and why that number for my volume?
2. What steel, and what rated shot life?
3. Cold runner or hot runner, and what is the shot weight including runner?
4. What is the quoted lead time from approved design to first samples, and what is the sampling loop if the first samples fail?
5. Who owns the tool, where is it stored, and what are the release terms?

The fifth question is commercial rather than technical, and it is the one that decides your freedom on the second order. Tooling ownership in a turnkey contract covers the three clauses to get in writing before you pay a deposit.

Budget the trials, not just the tool

A tooling budget that only covers the tool is short. Allow for:

• Sampling rounds. First shots rarely pass. Two or three adjustment loops is normal and each has a lead time.
• Material trials. The resin you specified may behave differently from the one the tool was designed around.
• Texturing. Often quoted separately and done by a specialist after the tool is proven.
• Fixtures and gauges. Assembly jigs and inspection gauges are separate tools with their own cost.

None of these are surprises to the factory. They are only surprises to buyers who budgeted the mold and nothing else.

Where tooling sits in a turnkey quote

Under a turnkey contract the factory carries the coordination but the tooling is still quoted as its own line, paid before production and owned according to the contract. It is the one part of a turnkey scope that stays visible, which makes it the best place to compare quotes honestly. See what drives the cost of turnkey manufacturing in Vietnam for the rest of the number.

Lead time is part of the cost

A tool quoted two weeks faster is often worth more than a tool quoted ten percent cheaper, because tooling sits on the critical path and everything behind it waits.

Ask for the lead time split into design, cutting and sampling, and ask what the shop’s current queue looks like. A quote of six weeks from a shop with an eight week backlog is a fourteen week tool. Shops rarely volunteer the queue and almost always answer honestly when asked.

Also ask what happens if first samples fail. A shop that builds a correction loop into its quoted timeline is describing reality. One that quotes only the happy path will be renegotiating the date in a month.

Design changes after the tool is cut

Steel can be removed easily and added back expensively. That single fact should shape how you approach tool design review.

Making a feature larger usually means cutting more steel away, which is straightforward. Making it smaller means welding and re-machining, or replacing an insert, which costs real money and can affect the surface.

The practical consequence: where a dimension is uncertain, start on the side that leaves you room to remove steel later. Tool makers know this and will advise on it if asked, and it is one of the most useful questions you can put to them during design review.

Send your brief with the part drawing and we will match it with manufacturers that have their own tool room or a tool shop they work with regularly.

Frequently asked questions

Keep reading

• Bill of Materials for a Turnkey Order: How to Read the Cost Line by Line
• What Drives the Cost of Turnkey Manufacturing in Vietnam