Common Transform Table

Complete reference table of frequently used Laplace transforms

Quick Reference

The Laplace transform is defined as: L{f(t)} = F(s) = ∫[0 to ∞] e^(-st) f(t) dt

Basic Functions

f(t)F(s)Region of Convergence
δ(t)1All s
u(t)1/sRe(s) > 0
t1/s²Re(s) > 0
t^nn!/s^(n+1)Re(s) > 0
e^(at)1/(s-a)Re(s) > a
te^(at)1/(s-a)²Re(s) > a

Trigonometric Functions

f(t)F(s)Region of Convergence
sin(ωt)ω/(s² + ω²)Re(s) > 0
cos(ωt)s/(s² + ω²)Re(s) > 0
e^(at)sin(ωt)ω/((s-a)² + ω²)Re(s) > a
e^(at)cos(ωt)(s-a)/((s-a)² + ω²)Re(s) > a
t·sin(ωt)2ωs/(s² + ω²)²Re(s) > 0
t·cos(ωt)(s² - ω²)/(s² + ω²)²Re(s) > 0

Hyperbolic Functions

f(t)F(s)Region of Convergence
sinh(at)a/(s² - a²)Re(s) > |a|
cosh(at)s/(s² - a²)Re(s) > |a|
t·sinh(at)2as/(s² - a²)²Re(s) > |a|
t·cosh(at)(s² + a²)/(s² - a²)²Re(s) > |a|

Important Properties

Linearity

L{af(t) + bg(t)} = aF(s) + bG(s)

Time Shifting

L{f(t-a)u(t-a)} = e^(-as)F(s)

Frequency Shifting

L{e^(at)f(t)} = F(s-a)

Scaling

L{f(at)} = (1/a)F(s/a)

Differentiation

L{f'(t)} = sF(s) - f(0)

Integration

L{∫[0 to t] f(τ)dτ} = F(s)/s

💡 Quick Tips

  • • Always check the region of convergence when using transforms
  • • Use linearity property to break complex functions into simpler parts
  • • Remember that u(t) is the unit step function (0 for t<0, 1 for t≥0)
  • • For inverse transforms, use partial fraction decomposition
  • • Time-domain convolution becomes multiplication in s-domain