📊 Math & Data
Mathematical and statistical calculators — BMI, percentage change, fraction simplifiers, statistics (mean, median, standard deviation), random number distributions, binary/hex converters, and scientific notation tools. For when a spreadsheet is overkill.
💼 Salary Calculator
Convert salary between hourly, daily, weekly, monthly, and annual amounts. Compare job offers and freelance rates with adjustable hours per week.
Compound Interest Calculator
Calculate investment growth with compound interest: lump sum or recurring contributions, multiple compounding frequencies, inflation adjustment, effective APY, growth chart, and year-by-year breakdown.
Expression Calculator
Evaluate math expressions safely (no eval): arithmetic, trigonometry, logarithms, factorials, powers, roots, percentages, and constants (pi, e, tau). Supports parentheses, memory variables, and step-by-step trace.
Fraction Calculator
Add, subtract, multiply, and divide fractions and mixed numbers. Auto-simplifies to lowest terms, shows step-by-step work, converts between fractions, mixed numbers, and decimals.
Loan Calculator
Calculate monthly payments, total interest, and a full amortization schedule for any fixed-rate loan or mortgage. Add extra payments to see interest savings, view a balance chart, and export to CSV.
Number Formatter
Format numbers with thousands separators, decimal places, currency, scientific and compact notation. Pick a locale or currency and copy the result.
Pace Calculator
Calculate running pace, finish time, or distance. Enter any two of pace, time, and distance — get the third, plus splits per kilometre and mile.
Percentage Calculator
Solve everyday percentage problems: X% of Y, what % is X of Y, percent change (increase/decrease), find the original before a percentage change. Live results, history, and shareable deep-links.
Permutation & Combination Calculator
Calculate permutations nPr and combinations nCr — exact big-integer results for n up to 5000, with step-by-step factorial breakdown.
Prime Number Checker
Check if a number is prime, find the next prime, factorize into prime factors, list all primes up to a limit, and more — live in your browser.
Sales Tax & VAT Calculator
Add or remove sales tax and VAT from any amount. Find the price before tax, the tax amount, and the final price with tax for any tax rate.