Math
Numbers, sorted.
Convert any unit, run the property and paycheck calculators, and brush up on mental math — the everyday number tasks, all client-side and instant.
These are the number tasks that interrupt other work — converting a unit, splitting a bill, checking a take-home figure, or doing arithmetic you'd rather not do on paper. Each runs instantly in your browser, with no ads mid-calculation and nothing sent anywhere. The set covers unit and measurement conversions, practical calculators for money and property, and quick mental-math references for when you just need the method. They're built to be scannable and fast rather than exhaustive — grab the answer and get back to what you were doing. If you convert the same units often, bookmark that specific converter so it's one tab away.
Unit conversions
Unit converter →
Length, weight, volume, temp & more
Mental math →
Tricks & quick estimation tables
Cooking conversions →
Cups, grams, oven temps & more
Everyday calculators
Percentage calculator →
% of, % change & X is what %
Tip calculator →
Tip, total & split the bill
Discount calculator →
Sale price & how much you save
Sales tax calculator →
Add or back out sales tax
BMI calculator →
Body mass index + category
Money & loans
Loan calculator →
Monthly payment & total interest
Compound interest calculator →
Savings growth with contributions
Mortgage calculator →
Monthly payment & total interest
Affordability calculator →
Max home price from your income
Cash-to-close estimator →
Total cash due at closing
Paycheck calculator →
Take-home pay after taxes
Dates & time
Date calculator →
Days between dates & add days
Age calculator →
Exact age in years, months, days
Hours calculator →
Time between two times, with breaks
Everything here runs entirely in your browser — nothing you type is sent anywhere, which matters when you're putting in a salary or a home price. The converter handles length, weight, volume, temperature and more; the property calculators cover the numbers that come up when buying a home; and the paycheck estimator gives a realistic take-home figure. Treat the financial tools as solid estimates for planning, not formal quotes — your actual mortgage, closing costs and withholding depend on your lender, location and full tax situation.