Spring Constant Calculator
Infer ideal linear spring stiffness from force, hanging mass or oscillation measurements.
A QUICK WALKTHROUGH
How to use this tool
- Choose a method and explicit units.
- Enter your own measured or model parameters.
- Calculate, inspect the table, then copy or download the frozen report.
Scope and assumptions
Force mode uses k=|F|/|x|: force and displacement signs describe your measurement convention, not a restoring-force sign test. F may be zero, x must be nonzero. Static hanging mass uses k=mg/|x| with your own positive g; dynamic mode uses k=4π²m/T² or 4π²mf². Mass, period and frequency must be positive. Stored energy is kx²/2; dynamic energy requires a supplied amplitude ≥0. Dynamic mass is effective oscillating mass; damping and spring mass corrections are excluded. These are inferred stiffness values, not material, fatigue or safe-travel ratings.
GOOD TO KNOW
Common questions
How are inputs processed?
Calculations run in your browser. Editing any field clears the previous result and report.
What precision is reported?
The table uses 12 significant digits; the report also records unrounded numeric values.
Scope and assumptions?
Force mode uses k=|F|/|x|: force and displacement signs describe your measurement convention, not a restoring-force sign test. F may be zero, x must be nonzero. Static hanging mass uses k=mg/|x| with your own positive g; dynamic mode uses k=4π²m/T² or 4π²mf². Mass, period and frequency must be positive. Stored energy is kx²/2; dynamic energy requires a supplied amplitude ≥0. Dynamic mass is effective oscillating mass; damping and spring mass corrections are excluded. These are inferred stiffness values, not material, fatigue or safe-travel ratings.