All Calculators
Every tool on NumberCalculator365, grouped by topic. Each calculator includes the formula it uses, step-by-step instructions and worked examples.
Math Calculators
Percentages, fractions, statistics and scientific math.
Percentage Calculator
Find X% of Y, what percent one number is of another, and percent change.
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers.
Scientific Calculator
Trig, logarithms, exponents, roots and factorials in your browser.
Average Calculator
Mean, median, mode and range of any list of numbers.
Random Number Generator
Generate random integers or decimals in any range.
Standard Deviation Calculator
Sample and population standard deviation and variance.
Financial Calculators
Loans, mortgages, interest, tips and discounts.
Loan Calculator
Monthly payment, total interest and total cost of a loan.
Mortgage Calculator
Monthly principal and interest with an amortization breakdown.
Interest Calculator
Simple interest earned or owed over time.
Compound Interest Calculator
Growth of savings with compounding and monthly contributions.
Auto Loan Calculator
Car payments including trade-in, down payment and sales tax.
Tip Calculator
Tip amount and per-person split for any bill.
Discount Calculator
Sale price and savings from a percent off or dollar discount.
Health Calculators
BMI, calories, BMR, body fat and ideal weight.
BMI Calculator
Body mass index with standard adult weight categories.
Calorie Calculator
Daily calorie needs based on your BMR and activity level.
Body Fat Calculator
Body fat percentage with the U.S. Navy tape method.
BMR Calculator
Basal metabolic rate with Mifflin-St Jeor and Harris-Benedict.
Ideal Weight Calculator
Ideal body weight by Devine, Robinson, Miller and Hamwi.
Date & Time Calculators
Age, date math, time sums and days between dates.
Conversion Calculators
Length, weight, temperature, area and volume.
Length Converter
Inches, feet, yards, miles, millimeters, meters and kilometers.
Weight Converter
Pounds, ounces, stones, grams, kilograms and tons.
Temperature Converter
Fahrenheit, Celsius, Kelvin and Rankine.
Area Calculator
Area of rectangles, circles, triangles and more.
Volume Calculator
Volume of boxes, cylinders, spheres, cones and more.
Construction Calculators
Concrete and material estimates for projects.
Education Calculators
GPA and grade calculators for students.