Math & Productivity Calculators
Statistics, dates, conversions and time tools.
Average Calculator
Mean, median, mode and range
Binary, Hex & Decimal Converter
Convert between number bases
Date Calculator
Days between dates, add or subtract days
Fraction Calculator
Add, subtract, multiply and divide fractions
GPA Calculator
Grade point average on a 4.0 scale
Grade Calculator
Weighted grade and what you need on the final
Random Number Generator
Random numbers with or without repeats
Ratio Calculator
Simplify and scale ratios
Roman Numeral Converter
Numbers to Roman numerals and back
Standard Deviation Calculator
Population and sample standard deviation
Time Zone Converter
Convert time between cities
Timer & Stopwatch
Countdown timer with alarm and lap stopwatch
Work Hours Calculator
Timesheet totals and pay
Statistics, fractions, dates, number bases, grades, time zones and timers: small tools that save time on schoolwork and daily planning.
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Popular Calculators
Our most-used converters and calculators.
Finance Calculators
Loans, mortgages, interest, tax and business maths.
Health & Fitness Calculators
Body, nutrition, training and sleep estimators.
Home & Everyday Calculators
Practical tools for DIY, driving and household bills.