計算機の使い方

当社の計算機は、金型加工コスト、部品単価、および総生産コストを数秒で見積もります。RFQ準備およびベンダー比較のために、当社の injection molding supplier sourcing guide 認定と商業リスクをカバーします。

より広い視点で見るには 射出成形、当社の基本ガイドでは、プロセスの基礎、材料の挙動、生産に関する決定事項をカバーしています。

計算機には3つの入力グループがあります。 パーツデザインでは、部品サイズ、複雑さ（アンダーカット、ねじ、サイドコア）、表面仕上げ（SPI¹/VDI規格）[fn:1] [fn:2]、および公差等級。 金型と生産, choose mold type (prototype aluminum, production P20, or hardened H13/S136), cavity count, resin, and expected mold life. In 生産量, drag the slider to your annual quantity — the tool automatically applies volume discounts above 5K, 10K, 50K, and 100K pieces.

Click Calculate Estimate to see the full cost breakdown: mold tooling cost, per-part piece price, material cost per part, estimated cycle time, amortized mold cost per part, and effective price per part at your volume.

What Drives Injection Mold Cost

Part complexity, cavity count, surface finish, and mold steel grade are the four cost drivers. A single-cavity aluminum prototype mold runs 1500 to 5000 USD; a multi-cavity production steel mold easily exceeds 50,000 USD.

Material choice also shifts the per-part cost significantly. Commodity resins like PP or ABS cost $1.80–$2.50/kg, while engineering grades like PEEK run $55/kg or more. Part weight, driven by size and wall thickness, multiplies that difference. At 60 grams for a medium part, PEEK material alone costs ~$3.80 per shot — compared to $0.14 for PP.

Volume is the great equalizer. Amortizing a $20,000 mold across 100,000 parts adds just $0.20 per piece. Across 1,000 parts, that same mold adds $20 per piece. This is why high-volume programs almost always justify hardened steel molds, while low-volume runs are better served by aluminum or prototype tooling.

Cost Benchmarks by Part Size

For a quick sanity check, here are typical mold tooling ranges for a moderate-complexity, single-cavity production mold (P20鋼², polished finish):

These ranges assume moderate complexity (some undercuts, standard side-action) and a polished VDI 3400 surface finish³. Adding multi-cavity layouts, precision tolerances, or unscrewing cores pushes costs into the next tier.

Per-Part Cost Breakdown

Per-part cost comes down to three components: material, processing (machine time and labor), and overhead (QC, packaging, secondary ops).

Material cost: resin price × part weight × 1.15 waste factor. For ABS at $2.50/kg and a 60 g part, that is roughly $0.17/part.

Processing cost: machine-hour rate ÷ 3600 × cycle time ÷ cavities. A 75-ton press at $75/hr running 25-second cycles on a single cavity costs ~$0.52/part.

Overhead: typically 20–30% on top of material + processing, covering QC inspection, packaging, and secondary trimming or assembly.

The calculator applies a 25% overhead margin and then layers on volume discounts: 5% at 5K, 10% at 10K, 15% at 50K, and 20% at 100K+ pieces.

When to Upgrade from Prototype to Production Tooling

If your annual volume is below 5,000 parts and the design is still changing, an aluminum prototype mold is almost always the right call. Tooling costs 40–70% less, lead time is shorter, and modifications are cheaper. The trade-off: mold life is typically under 100K shots, tolerances are looser, and surface finish options are limited.

For programs above 10,000 parts/year with a stable design, a production steel mold — specifically P20 tool steel — pays for itself within the first run. Better surface finish, tighter tolerances, longer mold life, and multi-cavity options all reduce per-part cost. At 50,000+ parts/year, hardened steel (H13/S136) becomes cost-effective because the extended mold life (500K–1M+ shots) eliminates retooling downtime.

Get a Precise Quote

For a precise quote tailored to your exact part, submit your 3D model and requirements to our engineering team — we respond within 24 hours with a detailed cost breakdown.

よくある質問

よくある質問

How accurate is the injection mold cost calculator?

Injection mold costs span a wide range depending on part size, complexity, and tooling grade. A single-cavity prototype aluminum mold for a simple part typically starts around $800 to $2,000. A single-cavity production mold in P20 steel with moderate complexity often lands around $1,800 to $3,000 for small parts, $3,200 to $5,500 for medium parts, and roughly $6,000 to $10,500 for large parts. Extra-large multi-cavity hardened steel molds (H13/S136) for high-volume production with tight tolerances can exceed $30,000 and reach $60,000+ for complex builds. Geographic location, lead time, validation scope, and sampling inclusion also affect pricing. –section 28

射出成形金型の典型的な費用はいくらですか？

Injection mold costs span a wide range depending on part size, complexity, and tooling grade. A single-cavity prototype aluminum mold for a simple part typically starts around $800 to $2,000. A single-cavity production mold in P20 steel with moderate complexity often lands around $1,800 to $3,000 for small parts, $3,200 to $5,500 for medium parts, and roughly $6,000 to $10,500 for large parts. Extra-large multi-cavity hardened steel molds (H13/S136) for high-volume production with tight tolerances can exceed $30,000 and reach $60,000+ for complex builds. Geographic location, lead time, validation scope, and sampling inclusion also affect pricing.

Does the mold cost per part decrease with higher volume?

Yes, mold tooling amortization is one of the most significant cost factors in injection molding. A $15,000 production mold spread across 10,000 parts adds $1.50 to each piece. The same mold across 100,000 parts adds only $0.15 per piece. Across one million parts, the tooling contribution drops to just $0.015. This relationship is the primary reason that high-volume programs can justify expensive, multi-cavity hardened steel molds — the per-part savings from faster cycles and higher cavity counts quickly outweigh the higher upfront tooling investment.

What material is cheapest for injection molding?

Among common injection molding resins, polypropylene (PP) at approximately $1.80 per kilogram and polyethylene (PE) are the lowest-cost commodity materials. ABS at roughly $2.50/kg is also widely used and competitively priced. Moving up the cost ladder, nylon (PA6/PA66) and POM are mid-range at $3.50–$4.00/kg. High-performance engineering resins like PEEK ($55/kg) and LCP ($18/kg) are significantly more expensive and are selected only when their mechanical, thermal, or chemical properties are required by the application. Material cost per part depends on both the resin price per kilogram and the part weight, which is determined by part size and wall thickness — always run the numbers for your specific geometry before making a final material selection.

How can I reduce my injection molding costs?

Three main levers control injection molding cost: design optimization, volume strategy, and mold steel selection. Design for manufacturability (DFM) reduces undercuts, maintains uniform wall thickness, and minimizes side-action complexity, which directly lowers tooling cost. Increasing production volume amortizes the mold investment over more parts, reducing the per-part tooling contribution. Finally, selecting the right mold steel — prototype aluminum for runs under 50K, production P20 for mid-volume, and hardened H13/S136 for 500K+ shots — avoids both under-investment (mold failure) and over-investment (unnecessary tooling expense).

Can I use an aluminum mold for production runs?

Aluminum molds are a practical choice for low to mid-volume production runs, typically up to 50,000 shots with moderate part complexity. They cost 40 to 70% less than steel tooling and have shorter lead times (2–4 weeks vs. 5–8 weeks for steel). Aluminum also dissipates heat faster than steel, which can reduce cycle times by 15–30%. However, for tight tolerances (below ±0.05 mm), high-polish surface finishes (SPI A-1), abrasive or glass-filled resins, or production volumes exceeding 100,000 shots, hardened steel tooling is the more reliable and cost-effective long-term choice.

1. SPI: SPI Surface Finish Standards is a classification system developed by the Society of the Plastics Industry that categorizes mold cavity surface textures from A-1 (mirror polish, diamond buffed) through D-3 (fine blasted stone). Higher finish grades require progressively more polishing time and directly increase mold manufacturing cost. ↩

2. P20鋼: P20 mold steel is a pre-hardened chromium-molybdenum alloy tool steel (AISI P20 / DIN 1.2311) widely used for production injection molds rated for 100K to 500K shots. It is supplied at 28–36 HRC hardness, machines readily, and accepts standard surface treatments including polishing, texturing, and plating. ↩

3. VDI 3400 surface finish: VDI 3400 is a surface texture standard published by the Verein Deutscher Ingenieure that defines EDM (electrical discharge machining) finishes by average roughness depth, ranging from VDI 0 (smoothest, Ra < 0.1 μm) to VDI 45 (Ra ~18 μm). It is commonly used alongside SPI grades to specify mold surface texture. ↩