Unit Converters
Professional conversion tools for packaging and supply chain professionals. Convert between standard and industry-specific units with precision.
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Learn about Unit Converters
7 sections including 3 FAQs
Learn about Unit Converters
7 sections including 3 FAQs
The Unit Converters provide quick, accurate conversion between measurement systems commonly used in packaging engineering. Packaging professionals frequently work across metric and imperial systems — especially when sourcing materials globally, communicating with international suppliers, or interpreting standards that use different unit systems. This tool handles length, weight, area, volume, pressure, and industry-specific conversions like basis weight, caliper, and board grade equivalents.
How it works
Conversion Categories
The tool covers standard unit conversions (inches to millimeters, pounds to kilograms, etc.) plus packaging-specific conversions that are harder to find: basis weight (lbs/1000 ft² to g/m²), caliper (points/mils to mm), ECT (lbf/in to kN/m), and burst strength (psi to kPa). Each conversion uses exact conversion factors from TAPPI and ISO standards rather than rounded approximations.
Example: Converting 200 GSM Linerboard to lb/MSF
A European supplier quotes linerboard at 200 g/m² (GSM). Your US specification uses lb/MSF (pounds per 1,000 square feet). The exact conversion factor:
lb/MSF = GSM / 4.882.
200 g/m² / 4.882 = 40.97 lb/MSF ≈ 41 lb/MSF.
This is equivalent to the US standard "42 lb" linerboard grade (the slight difference is due to the rounding convention in US grade names). Always use the exact conversion factor (4.882) for engineering calculations rather than rounded approximations.
When to use this tool
- Converting box dimensions between inches and millimeters for international supplier specifications
- Translating board basis weight between the US system (lbs/MSF) and metric (g/m²)
- Converting ECT values between lbf/in (US) and kN/m (international) for strength comparisons
- Translating weight limits between pounds and kilograms for shipping documentation
- Converting pressure units for burst and compression test results
Common mistakes to avoid
- Rounding conversions prematurely — small rounding errors compound when converting dimensions for a 48-box pallet configuration
- Confusing basis weight systems — US basis weight uses lbs per 1,000 square feet, while metric uses grams per square meter. A "42 lb" liner is not 42 g/m²
- Mixing up caliper measurements — "points" (1/1000 inch) and "mils" are the same unit, but "mm" is different. A 23-point board is 0.023 inches or about 0.58mm
- Using approximate conversion factors — for engineering calculations, use exact factors (1 inch = 25.4mm exactly, not "about 25mm")
Frequently asked questions
What is basis weight and how do I convert it?
Basis weight measures the weight of board material per unit area. In the US, it is expressed as pounds per 1,000 square feet (lbs/MSF). Internationally, it is grams per square meter (g/m² or GSM). To convert: g/m² = lbs/MSF × 4.882. For example, a 42 lb linerboard is approximately 205 g/m².
What is caliper in packaging?
Caliper is the thickness of board material. In the US, it is measured in "points" or "mils" (thousandths of an inch). Internationally, it is measured in millimeters. To convert: mm = points × 0.0254. For example, a combined board caliper of 150 points is approximately 3.81mm.
How do I convert ECT between US and metric units?
ECT (Edge Crush Test) in the US is measured in lbf/in (pounds-force per linear inch). The metric equivalent is kN/m (kilonewtons per meter). To convert: kN/m = lbf/in × 0.175. For example, 32 ECT = approximately 5.6 kN/m.