🔢Mathematics & Finance
Calculators for everyday life and finance: percentages, interest, dates, statistics and more – free in your browser, no sign-up.
19 free tools – right in your browser, no sign-up.
Percentage Calculator
Calculate percentages, percentage rates and changes
Compound Interest Calculator
Final capital, annual breakdown, optional deposits
Loan Calculator
Calculate monthly payment, total interest and amortization schedule for annuity loans
Date Difference & Age Calculator
Calculate the difference between 2 dates or exact age
Rule of Three Calculator
Calculate direct and inverse rule of three
VAT Calculator
Calculate value-added tax: net ↔ gross with 19%, 7% or a custom rate – including reverse calculation from the tax amount
BMI & Calorie Calculator
BMI category, BMR (Harris-Benedict) and daily calorie needs (TDEE)
Countdown Timer
Count down to a date & time – with fullscreen, themes and a shareable URL (all settings in the link)
Stopwatch & Interval Timer
Stopwatch with lap times and configurable interval timer
Pomodoro Timer
Focus timer with break intervals using the Pomodoro technique
Time Zone Comparison
Compare times across multiple time zones live – ideal for planning meetings across continents
Working Days Calculator
Calculate working days between two dates – with the public holidays of all 16 German federal states
Calendar Week Calculator
Show the current calendar week, convert date ↔ week number and view all ISO weeks of a year
Grade Average Calculator
Calculate a weighted grade average – German grades 1–6 or upper-school points 0–15 incl. conversion
Statistics Calculator
Calculate mean, median, standard deviation and more
Matrix & Vector Calculator
Matrix operations up to 4×4 and vector math
Number Sequences
Generate well-known mathematical sequences
ROI Calculator
Calculate return on investment easily
Meeting Cost Calculator
Real-time cost calculator for meetings