Percentage Calculator
Calculate percentages, percentage increase and change instantly in your browser.
Age Calculator
Find exact age in years, months and days between any two dates.
Date Duration Calculator
Count days, weeks, months and hours between two dates.
Discount & Sale Price Calculator
Work out sale price, double discounts and savings in seconds.
Tip Calculator & Bill Splitter
Calculate the tip and split a bill evenly among any number of people.
Unit Price Calculator
Compare price per unit between packages and see which one is cheaper.
BMI Calculator (with BMR & TDEE)
Calculate BMI, healthy weight range, basal metabolism and daily calorie needs.
Loan & Amortization Calculator
Monthly payment, total interest and full amortization schedule for any loan.
Compound Interest Calculator
Project savings growth with regular contributions and any compounding frequency.
Final Grade Calculator
See the score you need on a final exam to reach your target grade.
GPA Calculator
Add courses, letter grades and credits to calculate your GPA on a 4.0 scale.
Fuel Cost Calculator
Estimate trip fuel cost in L/100 km or MPG, with round-trip option.
Salary Converter
Convert hourly, weekly, monthly and yearly pay at any working-hours schedule.
Sales Tax Calculator
Add or reverse sales tax and get the total price including tax.
Random Number Generator
Generate cryptographically secure random numbers, with or without repeats.
Currency Converter
Convert between world currencies with daily mid-market rates; works offline with a bundled snapshot.
China Income Tax Calculator (IIT)
Estimate annual individual income tax with the seven-bracket progressive table, social insurance and special deductions.
Timesheet & Overtime Pay Calculator
Add regular and overtime hours at 1.5x, 2x or 3x multipliers to get weekly or monthly gross pay.
Workday Calculator
Add or subtract business days skipping weekends, or count working days between two dates.
Gross Margin Calculator
Calculate gross profit, gross margin percentage and markup from cost and revenue.
Break-Even Calculator
Find the units and revenue needed to cover fixed and variable costs, with contribution margin.
Sales Commission Calculator
Work out commission at any rate plus base salary and total monthly earnings.
Depreciation Calculator
Straight-line and double-declining-balance depreciation schedule with book value.
Sample Size Calculator
Get the required survey sample size for 90/95/99% confidence, margin of error and population size.
Electricity Cost Calculator
Estimate kWh usage and running cost of any appliance per day, month and year.
Sleep Cycle Calculator
Plan bedtimes or wake times around 90-minute sleep cycles to wake up rested.
Pregnancy Due Date Calculator
Estimate due date, conception date, current gestational week and trimester boundaries from LMP.
Body Fat Calculator (US Navy)
Estimate body fat percentage with the U.S. Navy tape method and see fat and lean mass.
Ohm's Law Calculator
Solve voltage, current or resistance and calculate power with the P = V·I triangle.
Rental Yield Calculator
Calculate gross and net rental yield, annual rent and expenses for a property.
Product Profit Calculator
Set a sale price against cost, shipping and platform fees to see profit, margin and ROI.
Volumetric Weight Calculator
Compare dimensional weight with actual weight using 5000, 6000, 7000 or 139 divisors.
Resistor Color Code Calculator
Read four-band resistor colors into ohms, multiplier and tolerance range.
Fraction Calculator
Add, subtract, multiply and divide fractions, automatically simplified with decimal result.
Schengen 90/180 Day Calculator
Check Schengen visa stays against the 90 days in any 180-day rule with a trip timeline.