Math & Everyday Calculators
Percentage, fraction, ratio, GPA, grade, tip and random-number tools for quick everyday math.
13 free tools · no sign-up · works in your browser
Coin Flip — Heads or Tails
Flip a virtual coin and get heads or tails instantly — with a history of your last flips.
Percentage Calculator
Work out what X% of a number is — and switch to the other common percentage questions too.
What Percentage Is X of Y Calculator
Find out what percentage one number is of another.
Prime Number Checker
Check whether a number is prime and see its full prime factorization.
Dice Roller
Roll up to 10 virtual dice — d4, d6, d8, d10, d12, d20 or d100 — perfect for board games and D&D.
Discount Calculator
Calculate the sale price and amount saved after a percentage discount.
Tip Calculator
Work out the tip and total bill, and split it evenly between any number of people.
Square Root Calculator
Find the square root, square and cube root of any number instantly.
Percentage Increase / Decrease Calculator
Calculate the percentage increase or decrease between two numbers.
LCM & GCF Calculator
Find the least common multiple (LCM) and greatest common factor (GCF/HCF) of two numbers.
Yes or No Wheel
Can't decide? Ask the wheel — get an instant YES or NO (with an optional Maybe) and settle it.
Random Name Picker
Paste a list of names or options and pick one at random — fair draws for giveaways, teams and classrooms.
Modulo Calculator
Calculate a mod b — the remainder after division — with the floor quotient shown too.
More tools coming soon
Validated, high-intent tools from our research catalog that are on the build roadmap.