What is the standard PCB copper weight?

The industry standard is 1oz copper (≈35µm). It suits most signal and low-to-medium current designs and offers the lowest cost and fastest lead times.

How does copper weight affect PCB cost and lead time?

Heavier copper increases material usage and process complexity (etching, plating, solder mask registration), so 2oz and above typically cost more and may have slightly longer lead times than 1oz.

What applications commonly use 2oz copper PCBs?

Power supplies and converters, LED lighting, motor drives, battery management systems, EV and automotive modules, aerospace and defence, renewable energy, and other high-current or high-reliability products.

Do you manufacture heavy copper PCBs above 2oz?

Yes. We can supply heavy copper up to 3oz, 4oz and beyond for specialised applications, subject to design rules and manufacturability checks.

Can I get quotes for both 1oz and 2oz copper to compare?

Absolutely. Many customers request pricing for both options to evaluate cost versus performance. Ask us to quote 1oz and 2oz (or heavier) for the same design.

2oz Copper PCBs Explained | Standard vs Heavy Copper

Q: When should I upgrade from 1oz to 2oz copper?

Upgrade when your design carries higher current, runs hotter, needs lower resistive loss, or operates in demanding environments such as automotive, power electronics, or industrial control. 2oz copper provides higher current capacity and improved thermal performance.

Introduction: why copper weight matters in PCB design

Every printed circuit board (PCB) relies on copper to conduct current between components. While the industry standard copper weight is 1oz per square foot (≈35µm thick), many designs require 2oz copper PCBs or even heavier copper to safely carry higher currents.

At Tate Circuits — a trusted UK PCB manufacturer with Shenzhen production — we’re often asked:
👉 “When should I upgrade from 1oz to 2oz copper?”
👉 “How does copper thickness affect PCB cost?”
👉 “What applications demand heavy copper?”

This guide explains the differences between standard 1oz copper and 2oz (or higher) copper PCBs, including applications, design considerations, cost impacts, and when to request both options in your PCB quote.

Our full technical PCB capabilities can be seen here.

What does “copper weight” mean?

Copper weight is measured in ounces per square foot (oz/ft²). This defines the thickness of copper laminated on the PCB substrate.

1oz copper = ~35µm thick
2oz copper = ~70µm thick
3oz copper = ~105µm thick
4oz+ copper = classed as heavy copper, typically used in specialised power applications

Standard 1oz vs 2oz copper — key differences

1oz copper PCBs (standard)

✅ Lowest cost, fastest to manufacture
✅ Ideal for signal circuits and low-to-medium current applications
✅ Industry standard for consumer electronics and most commercial products
❌ May struggle with high current or heat dissipation

2oz copper PCBs (upgraded)

✅ Doubles the current-carrying capacity compared to 1oz copper
✅ Reduces resistive losses and voltage drop
✅ Handles higher thermal loads — better for power electronics
✅ Provides extra mechanical strength for connectors and large pads
❌ Higher material cost and more complex manufacturing

Applications where 2oz copper is recommended

Power electronics

Power supplies and converters
Motor drives and inverters
LED lighting systems

Automotive & transportation

Battery management systems (BMS)
Electric vehicle charging circuits
High-current modules in harsh environments

High-current / high-reliability designs

Aerospace and defence electronics
Industrial controls and robotics
Renewable energy (solar inverters, wind control systems)

If your design must handle high currents, high heat, or high reliability, 2oz or heavier copper is often essential.

How copper weight affects manufacturing

Upgrading to 2oz or heavier copper adds complexity to the PCB manufacturing process:

Etching precision: Thicker copper requires wider trace clearances to avoid over-etching.
Drilling and plating: Via walls need more plating control to maintain reliability.
Solder mask registration: Thicker copper can create uneven surfaces, requiring tighter tolerances.
Lamination stress: More copper = more heat and pressure during production, increasing manufacturing difficulty.

This is why 1oz copper PCBs are cheaper and faster to produce, while 2oz+ PCBs involve additional cost and slightly longer lead times.

Cost vs performance: is 2oz copper worth it?

Cost: 2oz copper boards cost more than 1oz due to higher material usage and stricter process control.
Performance: They provide significantly higher current capacity, reduced heat, and greater long-term reliability.
ROI: In high-current applications, the extra cost is justified by performance gains and reduced risk of field failures.

When should you request 2oz copper?

Your design carries >2–3 amps per trace
You need better thermal management to prevent overheating
The PCB operates in harsh environments (automotive, aerospace, industrial)
You are designing power boards where reliability is critical
Your connectors, pads, or vias need extra mechanical strength

👉 Tip: Many of our customers request quotes for both 1oz and 2oz copper options to compare cost vs performance before deciding.

FAQs: 2oz copper PCBs explained

Q: What is the most common PCB copper weight?
A: 1oz copper is the industry standard and used in most PCBs.

Q: Why choose 2oz copper over 1oz?
A: 2oz copper provides double the current-carrying capacity, better heat dissipation, and is ideal for power and automotive electronics.

Q: How does copper weight affect PCB cost?
A: Heavier copper requires more material and tighter process control, so 2oz PCBs are more expensive than 1oz boards.

Q: Can you manufacture 3oz or 4oz copper PCBs?
A: Yes, Tate Circuits can supply heavy copper boards up to 4oz and beyond for specialised applications.

Q: Should I always upgrade to 2oz copper?
A: Not always — 1oz is sufficient for most signal circuits and low-current designs. 2oz should be chosen where current, heat, or reliability demand it.

Why engineers choose Tate Circuits

Over 50 years as a UK PCB manufacturer
ISO-certified, UL-approved, RoHS-compliant PCBs
Standard 1oz and upgraded 2oz+ copper PCBs available
UK-based engineers to advise on copper weight, stackup, and reliability
Fast lead times, including express options
Flexible invoicing — order now, pay on delivery

📩 Ready for a quote?

Not sure whether your design needs 1oz or 2oz copper?
Ask Tate Circuits for pricing on both options and compare cost vs performance before you decide.
Request a fast PCB quote ›