Math & Calculators
Free online calculators for everyday math — percentages, BMI, dates and more. Instant results, no signup.
Free online calculators for everyday math, health and planning. Work out percentages, BMI, age, calories, dates and discounts, or use the scientific calculator for trigonometry, logarithms and exponents. Whether you are calculating a tip at a restaurant, a GST amount for a business invoice, or your ideal body weight, these tools give instant, accurate results with no signup and no install.
Everyday Math
Instant calculators for the math you do every day — basic arithmetic, percentages, tips, discounts and fractions.
Basic Calculator
Free online calculator for quick everyday arithmetic — addition, subtraction, multiplication, division and percentages.
Percentage Calculator
Calculate percentages, percentage change and percentage of a number instantly. Free online percentage calculator.
Tip Calculator
Calculate the tip on a bill and split the total between any number of people. Free online tip calculator and bill splitter.
Discount Calculator
Calculate the final price after one or more stacked percentage discounts, plus tax. Free online discount and sale price calculator.
Fraction Calculator
Add, subtract, multiply or divide fractions and mixed numbers, with results automatically simplified. Free online fraction calculator.
Health & Fitness
Work out your BMI, daily calorie needs, ideal body weight or pregnancy due date — health calculators with clear reference ranges.
BMI Calculator
Calculate your Body Mass Index from height and weight in metric or imperial units, with healthy range guidance.
Calorie Calculator
Estimate your daily calorie needs (TDEE) from age, height, weight and activity level — with targets for weight loss, maintenance and gain.
Ideal Weight Calculator
Estimate your ideal body weight using the Devine, Robinson, Miller and Hamwi formulas from your height and gender. Free ideal weight calculator.
Pregnancy Due Date Calculator
Estimate your due date and current gestational age from your last period, conception date or IVF transfer date. Free pregnancy due date calculator.
Dates & Time
Calculate your exact age from a date of birth, or the number of days between any two dates.
Age Calculator
Calculate exact age in years, months and days from a date of birth — plus total days lived and days until the next birthday.
Date Difference Calculator
Calculate the exact time between two dates in years, months, weeks and days. Free date duration calculator for deadlines, anniversaries and planning.
Scientific & Statistical
Trigonometry, logarithms and exponents on the scientific calculator, plus mean, median, mode and standard deviation for datasets.
Scientific Calculator
A scientific calculator with trig, logarithm, exponent, factorial and root functions. Free online scientific calculator, works entirely in your browser.
Average / Statistics Calculator
Calculate mean, median, mode, range and standard deviation from a list of numbers. Free online statistics calculator.
Money & Tax
Calculate GST amounts for invoices, including the reverse calculation to extract tax from a total.