Math & Numbers
Math & Number Tools
5 free calculators and converters for everyday math needs.
Percentage Calculator
Calculate percentages, changes, and find what percent one number is of another
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Unit Converter
Convert length, weight, temperature, and more
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Random Number Generator
Generate random numbers within any range you set
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BMI Calculator
Calculate your Body Mass Index with metric or imperial units
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Tip Calculator & Bill Splitter
Calculate tip amount and split the bill among any group
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Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal
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Roman Numeral Converter
Convert numbers to Roman numerals and back (1–3999)
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Compound Interest Calculator
Calculate compound interest with year-by-year breakdown
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Discount Price Calculator
Find final price, discount percentage, or original price
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Statistics Calculator
Calculate mean, median, mode, standard deviation, and more
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Prime Number Checker
Check if a number is prime and generate primes up to N
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Loan & Mortgage Calculator
Calculate monthly payments, total interest, and full amortization schedule
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Aspect Ratio Calculator
Calculate missing width or height from an aspect ratio. Supports 16:9, 4:3, and custom ratios
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GPA Calculator
Calculate semester and cumulative GPA from courses, grades, and credit hours
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Calorie & BMR Calculator
Calculate your BMR and daily calorie needs based on activity level and goal
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Loan EMI Calculator
Calculate monthly EMI, total interest, and repayment for any loan.
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