Calculate percentages, loans, margins, and more instantly.
23 free tools — 100% client-side, no uploads
Easily calculate percentages, increases, and differences.
Determine the final price of an item after applying a discount.
Calculate gross margin and markup percentages.
Calculate your exact age in years, months, and days.
Full-featured scientific calculator with trig, log, and more.
Add, subtract, multiply, and divide fractions.
Generate random numbers within any range.
Sort a list of numbers with sum/average/min/max stats.
Solve proportions: if A/B = C/D, find the missing value.
Calculate the missing side of a right triangle.
Solve ax² + bx + c = 0 with real and complex roots.
Calculate mean, variance, and standard deviation.
Arithmetic and logic operations on binary numbers.
Calculate factorials, permutations, and combinations.
Convert between Roman numerals and decimal numbers.
Find greatest common divisor and least common multiple.
Check if a number is prime and find nearby primes.
Calculate logarithms with any base.
Calculate powers and nth roots of numbers.
Calculate sin, cos, tan and inverse trig functions.
Generate Fibonacci sequences of any length.
Add, multiply, transpose, and find determinants.
Calculate mean, median, mode, range, and std dev.
Calculate percentages, loans, margins, and more instantly. All tools run entirely in your browser using client-side JavaScript. Your data never leaves your device — no server uploads, no tracking, no accounts required. Bookmark this page to access all 23 tools instantly.