Calculator Tools
Online calculators for discounts, VAT, age, dates, loans, tips, and percentages.
57 tools available
Discount Calculator
Calculate final price after discount
VAT Calculator
Add or extract VAT from prices
Profit Margin Calculator
Calculate profit, margin, and markup
Rule of Three Calculator
Solve proportional relationships
Average Calculator
Calculate mean, sum, min, max
Age Calculator
Calculate age from birth date
Date Difference Calculator
Calculate days between two dates
BMI Calculator
Calculate Body Mass Index
Loan Calculator
Calculate monthly loan payments
Tip Calculator
Calculate tip and split bills
Date Calculator
Add or subtract days, weeks, months, or years
Business Days Calculator
Calculate working days between two dates
Days Until Calculator
Count days until a future date
Week Number Calculator
Find ISO week number for any date
Time Duration Calculator
Calculate duration between two times
Add/Subtract Time Calculator
Add or subtract hours and minutes
Countdown Calculator
Live countdown to a target date and time
Unix Time Now
Show current Unix timestamp instantly
Time Zone Converter
Convert time between different time zones
Calendar Week Calculator
Find start and end date of an ISO week
Percentage Change Calculator
Calculate percentage change between two values
Ratio Calculator
Simplify and calculate ratios
Price Per Unit Calculator
Calculate price per single unit
Split Bill Calculator
Divide a bill among multiple people
Simple Interest Calculator
Calculate simple interest on a loan or investment
Compound Interest Calculator
Calculate compound interest with contributions
Savings Goal Calculator
Calculate time to reach a savings goal
Hourly to Salary Calculator
Convert hourly rate to annual salary
Salary to Hourly Calculator
Convert annual salary to hourly rate
Unit Rate Calculator
Calculate rate per single unit
GPA Calculator
Calculate Grade Point Average
Grade Calculator
Calculate weighted grades and needed scores
Scientific Calculator
Advanced calculator with trigonometry and functions
Fraction Calculator
Add, subtract, multiply, and divide fractions
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal
Equation Solver
Solve linear and quadratic equations
Final Grade Calculator
Calculate what you need on your final exam
Percentage Grade Calculator
Convert points to percentage and letter grade
Study Time Calculator
Plan your study schedule
Reading Speed Calculator
Calculate words per minute and reading time
Essay Word Count Planner
Plan word count distribution for essays
Multiplication Table Generator
Generate multiplication tables
Prime Number Checker
Check if a number is prime
Roman Numeral Converter
Convert between Roman and Arabic numerals
Percentage Error Calculator
Calculate experimental error percentage
Unit Circle Helper
Find sin, cos, tan for common angles
Aspect Ratio Calculator
Calculate aspect ratio from dimensions
Power Current Voltage Calculator
Estimate DC or AC power, current and voltage
Energy Consumption Calculator
Estimate energy usage and optional cost
Solar Panel Output Calculator
Estimate PV array daily and monthly output
Solar System Size Calculator
Estimate solar panel capacity from energy use
Battery Runtime Calculator
Estimate battery runtime from usable capacity
Battery Capacity Calculator
Estimate required battery capacity
Inverter Size Calculator
Estimate inverter size from connected loads
Voltage Drop Calculator
Estimate voltage drop in wire runs
Wire Size Calculator Basic
Estimate cable cross-section from voltage drop
LED Power Calculator
Estimate LED power and daily energy use
Frequently Asked Questions
What calculations can I perform?
We offer discount calculators, VAT calculators, age calculators, date calculators, loan calculators, tip calculators and percentage calculators.
Is my financial data safe?
Yes, all calculations happen locally in your browser. No data is transmitted or stored anywhere.