Math Calculators
Calculate tips, interest and loans. All tools run entirely in your browser: free, instant, and with no sign-up.
Tip Calculator
A tip calculator works out how much gratuity to add to a bill and what each person owes when splitting it. Enter the bill amount, pick a tip percentage such as 15%, 18%, or 20%, and set the group size. The tool instantly shows the tip, the grand total, and the per-person share.
Compound Interest Calculator
Compound interest is interest earned on both your original principal and the interest already accumulated, which makes money grow faster than simple interest. This calculator projects how a deposit grows over time given an interest rate, compounding frequency, and optional regular contributions, showing your final balance and total interest earned.
Loan Calculator
A loan calculator estimates the fixed monthly payment on an amortized loan (such as a mortgage, auto loan, or personal loan) from the loan amount, annual interest rate, and repayment term. It also shows the total interest and total amount you will pay over the life of the loan.
Prime Number Checker
A prime number checker tests whether a whole number is prime: divisible only by 1 and itself. Enter any number to see instantly if it is prime; if it is not, the tool lists its factors and prime factorization. You can also generate every prime number within a chosen range.