The hardest part of most calculations is not the maths — it is finding a tool you can trust. Here you get both halves: the computation itself and a plain-English explanation of what drives it.
The worked examples below use realistic figures, not textbook toys. Each step is shown openly, precisely so that you can verify it.
What you're calculating
For 6.0 mm the closest fraction is 15/64" (5.95 mm) — the 0.05 mm gap is negligible for most work, but critical in precision machining. Imperial = diameter-threads per inch (1/4-20 UNC). Screw size chart (M3–M30) turns technical references — thread sizes, pipe diameters, sheet-metal gauge, drill-bit sizes — from scattered tables into one fast converter. Industrial standards live in different systems (metric, imperial, DIN, ANSI, ISO), and a conversion error usually means an incompatible part.
Where income, tax or contributions are involved, the reference framework is ATO (Australian Taxation Office) and Medicare Levy 2% — income tax 0–45%, GST flat 10%. Core formulas: metric drill diameter direct in mm; fractional drill = numerator/denominator × 25.4 mm; M6×1.0 thread = 6 mm diameter, 1.0 mm pitch; NPS (Nominal Pipe Size) is not the actual diameter but a standard designation (2" NPS = 60.3 mm OD); sheet-metal gauge is inverse to thickness (smaller number = thicker sheet).
The mechanics, briefly
Mark parts with permanent marker (M6, 1/4"-20) so they don't mix up. Classic: confusing NPS with OD (2" NPS ≠ 2" pipe, it's 2.375"). For drill bits: keep a set in mm and in inches.
Second: swapping BSP (British) with NPT (US) — different angles (55° vs 60°) don't mate without an adapter. When ordering US parts, always request technical documentation with exact mm — don't rely on 'approximately'. Keep the most-used conversion tables on hand in the workshop. Third: sheet-metal gauge for steel vs aluminium are different tables.
The shortest path through this is a worked example.
The maths, step by step
How this calculation applies in Australia: Every figure above applies to Australia specifically and is reviewed when the rules change. Start by checking the input fields rather than the final number.
Getting the standard right the first time saves days of delay and hundreds of euros in mismatched parts. Example: a 10 mm drill converts exactly to a fractional inch size. Use when handling international documentation (US spec on a European machine), ordering replacement parts, welding (right electrode for the sheet thickness), plumbing (matching BSP–NPT threads), or machining (drill for M6 tap = 5.0 mm, not 6.0).
Good times to run the numbers
DN (Diameter Nominal) is European metric; NPS is US imperial. Typical visitors are users in Sydney, Melbourne, Brisbane and Perth comparing offers or checking a bill, so the worked examples below use sensible local values rather than abstract numbers. Always cross-look over with a table for the specific pipe type. DN 50 ≈ NPS 2, but at larger sizes the mismatch grows.
Not exactly.
Putting the result to work
- VAT / sales tax: Australia's GST is a flat 10%, applied to most goods and services. Basic food, some health and education are GST-free. Businesses with turnover above $75,000 must register.
- Units of assess: Fully metric (km, kg, °C, L). Personal height occasionally still stated in feet/inches informally.
- Currency & format: Australian dollar (AUD, $ or A$).
- Electrical supply: 230 V / 50 Hz, Type I plug (three flat pins in V shape).
- Local notes: Values use Australian dollars, metric units and ATO defaults where applicable.
Notes from experience
Metric = M + diameter × pitch (M6×1.0). No conversions needed — Screw size chart (M3–M30) already uses Australian dollars, metric units and the rules the ATO applies. For Australia, use the units printed beside each field and do not assume that a familiar name means the same measurement system.
Industrial standards look dry but they're exactly why tens of thousands of firms in different countries can build compatible parts.
Where good calculations go bad
18 MSG steel = 1.27 mm; 18 AWG aluminium = 1.02 mm — not the same. Screw size chart (M3–M30) removes the drudgery — instead of digging through tables, you get a specific size in a minute. In Europe — thickness directly in mm (1.5 mm, 2.0 mm). The values entered here are Metric size.
The short version
A number you understand beats a number you merely have. Compare at least two scenarios before you commit; the contrast is where the insight lives.
Australia-specific questions
Is this Screw size chart (M3–M30) valid for Australia?
Yes. It uses Australian dollar (AUD, A$) and fully metric (km, kg, °C, L), and any tax or contribution reference follows ATO (Australian Taxation Office) rules.
Which units and number format are used?
Amounts display as A$1,234.56 and quantities in fully metric (km, kg, °C, L) — the official convention in Australia.
Which pension and tax model is assumed?
Superannuation Guarantee 11.5–12% + Age Pension. The tax framework is income tax 0–45%, GST flat 10%.