Compression spring calculator
Rate, Wahl stress and solid height from wire, OD, coils and free length.
Engineering tools
Spring calculators
First-pass rate and stress from your dimensions. Send the drawing afterwards and we confirm the design before production.
01 · Tools
Three calculators
Extension spring calculator
Rate and body stress from wire, OD, body coils and initial tension.
Spring rate converter
N/mm, kgf/mm and lbf/in, plus force, length and torque-per-degree.
02 · How to use them
Estimate, then send the drawing
Enter millimetres and newtons. The result is an indicative engineering estimate from standard formulae. Material constants are typical published G and E values.
Copy the link to keep the inputs. Use Get this spring made to pre-fill the quote form with wire, OD and type. Usual minimum order is 5,000–10,000 pcs. We reply within 24 hours.
03 · Questions
FAQ
Are these calculators a substitute for a drawing?
No. They are a first-pass check of rate and stress. Send the drawing or the sample and we will confirm the design before production.
Which units do the tools use?
Millimetres, newtons and N/mm. The rate converter also shows kgf/mm and lbf/in, which still appear on some drawings.
Can I get the spring made from these numbers?
Yes. Use “Get this spring made” to pre-fill the quote form. Usual MOQ is 5,000–10,000 pcs. We reply within 24 hours.
Request for quotation
Send your drawing or sample. Get a quote within 24 hours.
Tell us the spring type, quantity and what it has to do. Our usual minimum order is 5,000–10,000 pcs; smaller development runs are charged.