Directory
All calculators
48 polished mini-apps. Pick one — or search by name.
Math
Percentages, fractions, ratios — the everyday number-crunching toolkit.
math
PopularBasic Calculator
Add, subtract, multiply, divide.
math
Scientific Calculator
Trig, logs, powers — the full toolkit.
math
PopularPercentage Calculator
What's X% of Y, instantly.
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Percent Change Calculator
Increase or decrease, in percent.
math
Fraction Calculator
Add, subtract, multiply, divide fractions.
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Average Calculator
Mean, median, sum — paste any list.
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Ratio Calculator
Solve and simplify ratios in seconds.
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Square Root Calculator
√ for any number, plus powers.
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Random Number Generator
Pick a random number in any range.
math
Rounding Calculator
Round to any decimal or step.
Time & Date
Ages, durations, time zones, countdowns — anything you measure in time.
time
PopularAge Calculator
How old are you — to the day.
time
Date Calculator
Add or subtract days from a date.
time
Date Difference Calculator
Days, weeks, months between two dates.
time
Time Duration Calculator
Time elapsed between two clock times.
time
Hours Calculator
Total hours and minutes between times.
time
Countdown Timer
Count down to any moment.
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Stopwatch
Lap-friendly precision stopwatch.
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Timestamp Converter
Unix timestamps ↔ human dates.
time
Time Zone Converter
Convert times across cities.
time
Business Days Calculator
Count working days between dates.
time
Week Number Calculator
ISO week number for any date.
Money & Work
Tips, paychecks, loans, savings — calm money math for real life.
money
PopularTip Calculator
Quick tips for any bill.
money
Split Bill Calculator
Fair split with tip and tax.
money
Discount Calculator
Sale price after % off.
money
Sales Tax Calculator
Add tax to any price.
money
Work Hours Calculator
Hours per shift, including breaks.
money
Overtime Calculator
Regular and overtime pay.
money
Salary Calculator
Annual salary across pay periods.
money
Hourly to Salary Calculator
Hourly rate → annual salary.
money
Paycheck Calculator
Lite take-home estimator.
money
PopularLoan Payment Calculator
Monthly payment on any loan.
money
Mortgage Calculator
Monthly payment, total interest.
money
Interest Calculator
Simple and compound interest.
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Savings Calculator
Watch monthly deposits grow.
Conversions
Length, weight, temperature, cooking — convert anything in a tap.
conversions
Unit Converter
All your everyday unit conversions.
conversions
Length Converter
Meters, feet, miles and more.
conversions
Weight Converter
Kilograms, pounds, ounces.
conversions
Temperature Converter
Celsius, Fahrenheit, Kelvin.
conversions
Area Converter
Square meters, acres, hectares.
conversions
Volume Converter
Liters, gallons, cups, ml.
conversions
Speed Converter
km/h, mph, knots, m/s.
conversions
Data Storage Converter
Bytes, KB, MB, GB, TB.
conversions
Cooking Measurement Converter
Cups, tbsp, tsp, ml, grams.
Health
BMI, calories, macros, hydration — informational health helpers.
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