Unit converter
Compare thickness, dimensions, area, grammage and mass without mixing measurement types.
Convert unitsFOR ROLL MATERIAL BUYERS
Less guesswork.
A clearer roll order.
Convert specifications, work out material quantities and prepare a useful inquiry. Free tools, no sign-up required.
About this video
Free tools for roll material buyers at leetaiheng.com/tools, no sign-up required. Using example values only, this video runs three of them. The sample grammage calculator: three 100 × 100 mm samples cover 0.03 m², and if they weigh 3.6 g together the grammage is 120 g/m². The slitting yield calculator: slits per pass, material yield, width left unused, and a nearby width that yields better. The roll length calculator: one length from outside and core diameter, one from net weight, grammage and width, and a cross-check between the two. It closes with all seven tools: unit converter, sample grammage calculator, package volume and volumetric weight, roll area and net weight, slitting yield calculator, roll length calculator and inquiry brief builder. Prefilled values are examples, not confirmed LTH product specifications.
Sample grammage calculator
Calculate finished-material GSM from a measured rectangular sample—or several equal-sized samples weighed together.
Measure grammagePackage volume & volumetric weight
Estimate package volume and dimensional weight using outside measurements and the divisor supplied by your carrier.
Check shipment sizeRoll area & net weight
Turn roll width, length and quantity into order area. Add measured grammage to estimate net material weight.
Calculate an orderSlitting yield calculator
Explore equal-width slitting layouts from a master roll and compare the remaining width.
Plan a slit widthRoll length calculator
Estimate roll length from diameter or cross-check it using net material weight, grammage and width.
Estimate roll lengthInquiry brief builder
Build an editable English buying brief. Keep unknown specifications visible and copy, download or add it to an inquiry.
Prepare a briefUse your own measurements
Prefilled values are examples, not confirmed LTH product specifications. Supplier dimensions, measured grammage and production tolerances need to be checked for your specific construction.
From calculation to conversation
Use the inquiry brief builder to organise known dimensions and mark anything that needs confirmation. Explore roll materials when you are ready to compare constructions.
The unit, sample, area, packaging and inquiry tools run calculations and draft generation in your browser. An inquiry is sent only when you submit the inquiry form. See our privacy policy for site analytics.