Calculators
Handy online calculators for everyday life, finance, engineering and health - from percentage and interest to BMI, units and dates.
BMI Calculator
Enter body weight and height — BMI and weight category are calculated instantly.
Unit Converter
Convert units across length, weight, volume, area, temperature and power categories.
Percentage Calculator
Calculate percentages, apply markups or discounts, or extract VAT in three modes.
Color Converter
Enter a hex code, set RGB values or use the color picker — HEX, RGB, HSL and CMYK are shown live.
Date Calculator
Find the difference between two dates in days, or shift a date forward or backward by a given number of days.
Finance Calculator
Calculate monthly loan repayments, savings plan final value or compound interest result in three modes.
Ohm's Law Calculator
Fill in any 2 of the 4 electrical values — the other 2 are calculated automatically.
Electricity Cost Calculator
Enter device power, daily usage and electricity price — consumption and cost per day, month and year are calculated.
Currency converter
Convert amounts between more than 30 currencies using daily European Central Bank (ECB) rates — automatically updated, free and without sign-up.
Age Calculator
Calculate exact age from a date of birth — output in years, months and days plus total weeks and hours lived, free online without sign-up.
Tip Calculator
Calculate the tip amount and split the total bill among any number of people — set the percentage freely, free online without sign-up.
Time Zone Converter
Convert any date and time between time zones worldwide — daylight saving time and clock changes are handled automatically, free and without sign-up.
VAT Calculator
Calculate net, gross and VAT — Austria (20/13/10%) and Germany (19/7%).
ROI Calculator
Calculate return on investment from cost and return.
Discount Calculator
Instantly work out the final price and savings after a percentage discount — enter the original price and discount rate, free online without sign-up.
Inflation Calculator
Calculate loss of purchasing power — what an amount is worth in a few years.
Fuel Cost Calculator
Calculate fuel cost of a trip from distance, consumption and price.
Mortgage Calculator
Calculate the monthly payment, total cost and amortization schedule of a home loan.
Retirement Calculator
Project retirement capital from monthly savings rate, expected return and investment period — see contributions vs. gains at a glance, free online.
File Size Converter
Convert data sizes between bytes, KB/MB/GB (decimal) and KiB/MiB/GiB (binary).
Cooking Converter
Convert ingredients between volume (ml, cup, tbsp, tsp) and weight (g, kg) by density.
Calorie Calculator
Calculate basal metabolic rate (BMR) and total needs (TDEE) via Mifflin-St Jeor.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method from neck, waist and hip circumference — quick estimate free online, no account needed.
Ideal Weight Calculator
Calculate ideal weight with the Devine formula and the healthy BMI range (18.5–24.9) — just enter height and sex, free online without sign-up.
Water Intake Calculator
Estimate your daily water intake from body weight and activity level — guideline of about 33 ml/kg, higher during exercise, free online without sign-up.
Ovulation Calculator
Estimate fertile days and ovulation from last period and cycle length.
Pace Calculator
Calculate running pace (min/km) and speed from distance and time.
Scientific Calculator
Safely evaluate expressions with parentheses, powers and functions (sin, cos, log, √ …).
Fraction Calculator
Add, subtract, multiply or divide two fractions — reduced.
Statistics Calculator
Calculate mean, median, standard deviation and more from a list of numbers.
Grade Calculator
Calculate a grade average from several grades — optionally weighted (e.g. an exam counts double).
Aspect Ratio Calculator
Reduce an aspect ratio and compute the missing dimension when scaling.
Gross-Net Salary Calculator
Simplified net estimate with freely adjustable tax and social-security rates.