Last updated: August 2026
Nine free engineering calculators for people running heat sealing, drying and pressing equipment: belt length and speed, heat seal temperature, thermal expansion, heat transfer, coefficient of friction, PTFE chemical compatibility, OEE and the cost of downtime.
They all run in the browser, need no sign-up, and write their inputs into the page URL — so a calculation can be bookmarked or sent to a colleague and it opens with the same numbers.
Calculators & Reference Charts
- OEE CalculatorScore availability, performance and quality to benchmark a packaging line.
- Belt Length CalculatorWork out belt length for a two-pulley system from the pulley diameters and centre distance.
- Conveyor Belt Speed CalculatorConvert pulley RPM and diameter to belt speed in m/min, m/s or ft/min.
- Heat Seal Temperature CalculatorStarting temperature, dwell and pressure for LDPE, HDPE, PP, PET, nylon and PVC films.
- Thermal Expansion CalculatorLinear expansion for PTFE, stainless steel, aluminium and other materials over a temperature swing.
- PTFE Chemical Compatibility CheckerCheck PTFE against acids, solvents, fuels and industrial chemicals, with temperature ratings.
- Coefficient of Friction ChartStatic and kinetic friction values for PTFE, steel, aluminium, rubber and more.
- Heat Transfer CalculatorConduction through PTFE, steel and aluminium using Fourier’s Law.
- Downtime Cost CalculatorPut a dollar figure on unplanned downtime from lost revenue, labour and material waste.
Frequently Asked Questions
No. Every calculator runs entirely in your browser. Nothing is submitted, and no email address or account is required.
The calculators use standard engineering formulas and published material data, and are intended for sizing, comparison and planning. Treat them as a starting point rather than a certified design calculation, and validate anything safety-critical against your equipment manufacturer's figures.
