Free tools
Quick calculators for machine shops and CNC buyers.
Glossary
CNC terms in Vietnamese, Chinese and English for drawings, quotes and manuals.
Machine choice and cost
Pick a machine type, estimate part cost and work out the payback.
CNC machine selector
Enter part shape, size, stock type, machining needs and volume to get a recommended CNC machine type with reasons.
CNC machining cost calculator
Estimate CNC part cost and quote price: material, machine time, setup, tooling, outside processing, scrap and profit, in VND, USD, TWD, CNY, THB and more. Free online.
Payback calculator
Estimate yearly hours and cost saved by a new CNC machine, and how long it takes to pay back.
Material weight calculator
Formulas and a free calculator for round, hex and square bar, plate and tube weight, with a Ø10–Ø100 round bar weight chart (kg/m).
Import and exchange rates
Estimate import duty and landed cost, and convert quote currencies.
Vietnam CNC machine import duty calculator 2026 (free)
Calculate import duty, 8% VAT and landed cost for CNC lathes and mills imported into Vietnam. Free, updated for 2026.
Currency converter
Convert between 10 currencies: USD, CNY, HKD, TWD, JPY, EUR, KRW, THB, SGD and VND, with reference rates updated daily for imported machines and materials.
Machining data
Cutting data, tapers and chamfers, threads, drill sizes and hole coordinates.
Cutting data calculator
Free online: enter Vc and diameter to get spindle speed, feed rate, cutting power and cycle time, with a reference cutting speed table by material.
Taper, chamfer and nose radius calculator
Calculate taper angle and ratio from D, d and L; chamfer size with X/Z program points; and tool nose radius compensation for tapers and chamfers on CNC lathes.
Thread and tap drill calculator
Tap drills for metric M1–M39 with minor diameter ranges (M10 uses 8.5 mm), forming taps, UNC/UNF/UNEF, G, R/Rc/Rp and NPT/NPS pipe threads, trapezoidal and Helicoil, plus a thread-turning calculator.
Inch – mm converter and drill sizes
Convert inches and fractional inches to mm and back, and find the nearest number (#1–#80), letter (A–Z) and fractional drill, with full charts.
Bolt circle (PCD) hole coordinates
Enter the PCD, number of holes and start angle to get X, Y and C-axis angle for every hole, plus the distance between adjacent holes.
Materials and tolerances
Look up fits, surface roughness, equivalent steel grades and hardness.
ISO 286 hole tolerance chart and fit calculator
ISO 286 hole tolerance chart for H6, H7, H8, H9, H10 and H11 (3–500 mm), shaft chart for g6, h6, k6, p6, and a free fit calculator for deviations, clearance and interference.
Surface roughness conversion
Convert Ra to ISO 1302 N grades, Ra in microinches, estimated Rz, old ∇1–∇14 classes (GOST) and old JIS triangle marks, with typical machining methods.
Steel grade equivalents
Find equivalent grades of steel, stainless, cast iron, aluminum and copper alloys across JIS, GB, AISI/ASTM, DIN/EN and TCVN. Example: 1045 = S45C = C45 = 45.
Hardness conversion HRC – HV – HB
Convert steel hardness between Rockwell HRC, Vickers HV and Brinell HB per ASTM E140, with estimated tensile strength and an HRC 20–68 chart.