Calculators
Math, date, and reference calculators. All client-side.
Standard Calculator
Basic arithmetic
Geometry Calculator
Area, perimeter, volume
Timestamp
Unix ↔ date converter
Age Calculator
Birth date to exact age
Date Difference
Days between two dates
Day of Week
What day was this date?
Week Number
What week number is this date?
Planet Distance
Distance between planets in km/miles/AU
Percentage Calculator
X% of Y, add/subtract percentage
Unit Price Calculator
Compare prices per unit
Tip Calculator
Bill + tip %, split between people
Compound Interest
Principal, rate, years → future value
Loan / EMI Calculator
Monthly payment from principal, rate, term
Countdown Timer
Pick date/time, see live countdown