Estimate exercise heart-rate bands from age, with an optional resting-heart-rate method.
ProductivityEnter age.
Choose the maximum-rate method or the resting-rate method and input resting pulse if needed.
Read the estimated bands.
Found incorrect guidance or a result? Send the team steps and a non-sensitive example.
Convert year numbers between Buddhist Era and Common Era using a 543-year offset.
Calculate calendar age for a birth date and chosen reference date.
Check a Thai ID number's format and checksum without verifying its owner or issuance.
Set minutes and seconds for a countdown with start, pause and reset controls.
Generate a password with a chosen length and selected character groups.
Compare current times for the fixed set of cities displayed by the tool.