Most Popular Calculators

The 20 most-used calculators on AJ Designer, ranked by Google Search Console click data over the trailing 16 months. New here? Start with these — they're the ones other engineers, students, and DIYers find most useful.

Looking for something specific? Browse the full A–Z list at All Calculators (A-Z), or pick a category from the Calculators menu above.

  1. Dog AgeEveryday Tools
  2. Subwoofer Box Enclosure ComparisonAudio & Speakers
  3. Linear InterpolationAlgebra & Functions
  4. Overtime Pay RateEveryday Tools
  5. Bilinear InterpolationAlgebra & Functions
  6. Colebrook EquationFluid Mechanics
  7. Pay RaiseEveryday Tools
  8. Time Of ConcentrationFluid Mechanics
  9. Wing Lift EquationsPhysics
  10. Multiplication: Grid MethodArithmetic & Fractions
  11. Division: Long MethodArithmetic & Fractions
  12. Fraction: SimplifyArithmetic & Fractions
  13. Brinell Hardness NumberEveryday Tools
  14. Horsepower from Trap SpeedAutomotive & Engine
  15. Gutter DesignFluid Mechanics
  16. Earthquake SeismometerGeotechnical & Seismic
  17. Moment EquationPhysics
  18. Subwoofer Vent/PortAudio & Speakers
  19. Trigonometry EquationsAlgebra & Functions
  20. Capital RecoveryFinance & Investing