Dates, ages, tips, time cards, unit conversion and grades.
Exact age down to the day — plus how many days you have been alive and when the next birthday lands.
Days between two dates, or a date shifted forward or back — with business days counted separately.
The tip, the total and everyone's share — including whether to tip on the pre-tax amount.
Your grade point average from letter grades and credit hours — weighted, unweighted and cumulative.
Hours between two times, breaks deducted, overnight shifts handled, converted to decimal hours and pay.
Metric to imperial and back — length, weight, volume, temperature, area, speed and digital storage.
Every calculator in this category shows the formula it applies, so you can check the method rather than trusting a number. Results update as you type, and the share button encodes your inputs into the link so you can send a specific calculation to someone else.
Nothing you enter leaves your device. All 6 tools here run entirely in your browser.