The NumberTrove library
Everyday math
calculators.
Get a clear answer for common number problems without rebuilding the formula each time. These everyday tools cover percentages, dates, ratios, averages, fractions, and basic or scientific arithmetic.
Choose the right everyday math calculator
Check the units and the order of the inputs before calculating. When a result is used for money, health, or a purchase, treat it as a planning aid and verify the assumptions.
Every tool is free, browser-based, and includes its formula, assumptions, and related calculators. Use the links below to start with the result you need.
Percentage calculator
Find a percentage of a number quickly and clearly.
Everyday mathAge calculator
Calculate an age from a date of birth and today.
Everyday mathDate difference calculator
Count the calendar days between two dates.
Everyday mathTime duration calculator
Find the elapsed time between a start and end time.
Everyday mathFraction calculator
Add, subtract, multiply, or divide two fractions.
Everyday mathRatio calculator
Scale a ratio to find the missing equivalent amount.
Everyday mathAverage calculator
Find the simple average of up to five numbers.
Everyday mathRandom number generator
Generate a random whole number within a range.
Everyday mathWord and character counter
Count words, characters, sentences, and paragraphs in any text.
Everyday mathBasic calculator
Add, subtract, multiply, or divide two numbers.
Everyday mathAdvanced calculator
Evaluate scientific math expressions with functions, constants, and powers.
Everyday math