Online Calculators

Money math, minus the mental gymnastics

Most calculator visits are about money. The percentage calculator handles the three questions people actually ask: what is X percent of Y (discounts, tips, tax), what is the percentage increase or decrease (pay raises, price changes), and what percent one number is of another (test scores, conversion rates). The tip calculator takes it further for restaurant bills — set the tip rate, split the total across the table, and everyone sees what they owe without the awkward phone-math moment.

The loan calculator estimates your monthly payment from the loan amount, APR, and term, and shows total interest over the life of the loan. That total-interest number is the eye-opener: stretching a car loan from 48 to 72 months might drop the payment by a little while adding thousands in interest. Treat the result as a planning estimate, not a quote — fees, taxes, and lender terms will move the real number, so confirm with your lender before signing anything.

Three more money tools round out the set. The mortgage calculator estimates your monthly principal-and-interest payment from home price, down payment, rate, and term — the number behind every listing you browse. The compound interest calculator projects how savings grow with monthly contributions over years, showing exactly how much of the final number is your money versus growth. And the salary to hourly converter translates annual offers into hourly wages (and back) at your hours per week, with weekly, biweekly, and monthly breakdowns for budgeting.

Health numbers worth knowing

The BMI calculator computes your Body Mass Index from height and weight and places it in the standard categories. BMI is a screening tool, not a diagnosis — it doesn't distinguish muscle from fat, and athletes, older adults, and growing teens should read it with context. What it is good for is a quick, honest baseline.

The calorie calculator goes a layer deeper: it estimates your BMR (what you burn at rest) and TDEE (what you burn with your activity level), then gives targets for cutting, maintaining, or bulking. Pick the activity level honestly — most people overestimate — and treat the targets as a starting point to adjust over two to three weeks of real results.

School, measures, and everything else

Students get the GPA calculator: enter courses, grades, and credit hours for a 4.0-scale GPA, handy for checking where you stand before finals or estimating what you need to hit a target. And the unit converter covers length, weight, and temperature both directions between metric and imperial — recipes, DIY projects, travel, and homework, all in one page.

Every calculator on this page runs entirely in your browser. Your numbers are never sent to a server, stored, or tracked — which also means the tools work offline once the page has loaded.