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Every day, calculated.
Quick, accurate calculators for everyday questions. Type your numbers and see the answer instantly.
Calculators
Percentage Calculator
Three everyday percentage questions, answered as you type.
Date Calculator
Count days between dates, or jump a number of days ahead.
Age Calculator
Your exact age in years, months and days.
Compound Interest Calculator
See how money grows when interest earns interest.
Unit Converter
Metric and imperial, converted as you type.
BMI Calculator
Body mass index from height and weight.
Discount Calculator
Sale prices and savings, worked out as you type.
Average Calculator
Paste your numbers, get mean, median and more.
Word Counter
Words, characters and reading time, live as you type.
Random Picker
Draw a winner or shuffle a list, fairly.
Guides
How to Calculate Percentages Without Getting Confused
The three percentage questions people actually ask, how to solve each one, and the mental shortcuts that make discounts, tips and tax instant.
What BMI Can Tell You, and What It Honestly Can't
Where the body mass index comes from, why a 19th-century average became a personal health metric, what it is genuinely good for, and when it misleads.
Compound Interest, Explained With Actual Numbers
Why compounding starts slow and ends absurd, what the rule of 72 really tells you, how fees quietly reverse the effect, and the honest math behind it all.
Days Between Dates: Why Date Math Keeps Surprising Everyone
Fence-post errors, leap-year rules with two exceptions, months that refuse to be equal, and how deadlines actually count: the traps inside every date calculation.