Free Online Calculators: Dates, Percentages & Costs
Compare everyday quantities with explicit inputs. Work out percentages, date differences or the cost of recurring meetings, and change one input at a time to see how the result responds.
Percentage Calculator
Calculate percentages, percentage change, tips, and more
Age Calculator
Calculate your exact age in years, months, days, and more
BMI Calculator
Calculate your Body Mass Index and check your weight category
50/30/20 Budget Calculator
Calculate your budget using the 50/30/20 rule for financial planning
Tip Calculator
Calculate tips and split bills between friends
Pomodoro Timer
Stay focused with the Pomodoro technique timer
Aspect Ratio Calculator
Calculate and convert aspect ratios for images and video
Loan Calculator
Calculate monthly payments and total interest
Compound Interest Calculator
Calculate compound interest growth over time
Profit Margin Calculator
Calculate profit margins and markups
Discount Calculator
Calculate sale prices and savings
Salary Calculator
Convert between hourly, monthly, and yearly salary
VAT/Tax Calculator
Calculate VAT, sales tax, and price with tax
ROI Calculator
Calculate return on investment
Markup Calculator
Calculate markup percentage and selling price
Mortgage Calculator
Calculate monthly mortgage payments
Date Difference Calculator
Calculate days between two dates
Online Stopwatch
Simple stopwatch with lap times
Countdown Timer
Set a countdown timer for any duration
World Clock
View current time across different time zones
GPA Calculator
Calculate your grade point average
Fuel Cost Calculator
Calculate fuel costs for trips
Electricity Cost Calculator
Estimate electricity costs for appliances
Screen Resolution Calculator
Calculate PPI, aspect ratios, and scaling
Network Subnet Calculator
Network Subnet Calculator - Free online tool
Split Bill Calculator
Split Bill Calculator - Free online tool
Statistics Calculator
Calculate mean, median, mode, standard deviation, and more
Fraction Calculator
Fraction Calculator - Free online tool
Truth Table Generator
Truth Table Generator - Free online tool
Typing Speed Test
Test your typing speed and accuracy online for free
Spending Projection
Track your spending and income with a visual dashboard to project your financial future
Life in Weeks
See your whole life as a grid of weeks — one square per week, filled up to today
Meeting Cost Calculator
Price any meeting by the people in the room — per meeting, per year, and in hours burned
Caffeine Half-Life Calculator
Plot how much caffeine is still in your system at bedtime, drink by drink
Choose by the task you need to finish
- Use the meeting cost calculator to compare a one-off meeting with a weekly schedule.
- Choose a percentage or discount calculator to check a price change.
- Use date differences or a life-in-weeks calendar to explore time spans; review the assumptions shown by each calculator.