CalcLabb

Every calculator you need in one place

Free, accurate calculators that run in your browser. No sign-up.

  • Age Calculator

    Calculate exact age from a date of birth.

  • Hijri Calendar

    Browse the Umm al-Qura Hijri calendar and convert between Hijri and Gregorian dates.

  • Hijri Age Calculator

    Calculate age in Hijri years, months and days over the 1318-1500 AH Umm al-Qura table.

  • GPA Calculator

    Calculate GPA from credits and grades, add a previous GPA, or plan the GPA you need for a target.

  • CGPA Calculator

    Combine semester GPAs and credits into a cumulative GPA, then plan the GPA you need for a target CGPA.

  • BMI Calculator

    Calculate body mass index (BMI) from height and weight in metric or imperial units, with the adult weight range for your height.

  • Ireland Tax Calculator

    Estimate take-home pay after income tax, USC and PRSI in Ireland for 2026.

  • Netherlands Tax Calculator

    Estimate net salary and income tax in the Netherlands for 2026.

What you can calculate on CalcLabb

CalcLabb is a set of free online calculators that run in your browser, with no sign-up and no accounts. Students can work out a semester result with the GPA calculator or combine several terms with the CGPA calculator. They are separate tools because they answer different questions.

The Age Calculator turns a date of birth into years, months and days on today or any date you choose, in the Gregorian or Hijri calendar. For Islamic dates there is also a dedicatedHijri Age Calculator and aHijri Calendar for converting between Hijri and Gregorian dates.

For pay, the Ireland Tax Calculator and theNetherlands Tax Calculator estimate 2026 take-home pay from gross income. They are estimates, not payslips, and each page explains the assumptions behind its result.