Age Calculator
Exact age in years, months, and days between two dates, plus totals and next birthday.
Everyday Life
Age, dates, fuel use, and other day to day numbers.
Aurora Chance Calculator
Aurora latitude and hours from Kp.
Basketball Hoop Height Calculator
Basketball rim height and ball size by age.
Bathtub Volume Calculator
Bath gallons or liters from tub dimensions and fill level.
Bottled Water Cost Calculator
Yearly tap vs bottled water cost from daily liters and per gallon prices.
Braking Distance Calculator
Total stopping distance, reaction split, and car lengths from speed and surface.
Candle Light Hours Calculator
Turn rooms, candles per room, and burn hours into candles and light hours.
Car Seat Stage Calculator
Car seat stage from age, height, and weight per AAP and NHTSA.
Car Wash Water Calculator
Water used washing a car by hose, bucket, or bay, in gal or L.
Coffee Cost Calculator
Daily, monthly, and yearly spend from cups per day and price.
Commute Cost Calculator
Weekly and yearly drive to work cost with fuel and CO2.
Date Difference Calculator
Total days, weeks, and months between any two calendar dates.
Defrost Time Calculator
Fridge days, water hours, and changes from weight.
Dew Point Calculator
Dew point, temperature spread, and comfort reading from air temp and humidity.
Dimensional Weight Calculator
Parcel DIM and billable weight in imperial and metric.
Dishwasher Handwash Calculator
Machine vs hand dishwater gallons and savings.
EV Charging Cost Calculator
Full charge cost, range, and cost per mile for electric cars.
First-Class Postage Calculator
First-Class postage from piece type, weight, and machinability at retail rates.
Flight CO2 Calculator
Flight CO2 kg from miles, haul band, and cabin.
Fuel Economy Calculator
MPG and L/100km from trip distance and fuel used, plus trip cost at your fuel price.
Heat Index Calculator
Feels like temperature from air temp and humidity, with heat illness guidance in F and C.
Ladder Angle Calculator
Ladder 4:1 set with base and rails.
Laundry Cost Calculator
Weekly and yearly water plus water cost from loads, machine type, and rate.
Leaky Faucet Calculator
Gallons and dollars wasted per year from drips per minute.
Lightning Distance Calculator
Storm distance in miles and km plus shelter verdict from flash to thunder seconds.
Moving Boxes Calculator
Boxes, tape, and truck size from home size.
Museum Ticket Cost Calculator
Price a museum visit from adult and kid counts with per person average.
Passport Photo Size Checker
US passport photo size and head check.
Power Outage Food Safety Calculator
Keep or toss verdict with rule and tip from outage hours and appliance.
Propane Tank Calculator
Propane left in pounds and gallons plus grill burn time from weights.
Rainy Day Percent Calculator
Turn rainy days and total days into rain percent, dry days, and dry percent.
Road Trip Cost Calculator
Fuel used and total cost for any drive from distance and mileage.
Shower Cost Calculator
Water per shower, yearly gallons, and heating energy from minutes and flow rate.
Sidewalk Salt Calculator
Deicer pounds for any walk or driveway at smart rates.
Sleeping Bag Rating Calculator
Sleeping bag comfort and limit from night low.
Snow to Water Calculator
Liquid inches from snowfall and snow type.
Split Bill Calculator
Even shares with tax and tip for restaurant bills.
Standing Desk Height Calculator
Desk, standing desk, and seat heights from stature.
Storage Unit Size Calculator
Unit footprint, area, and volume from home size.
Tide Height Calculator
Tide level and state from high, low, hours.
Time Duration Calculator
Hours and minutes between two times, with totals and decimal hours for timesheets.
Tire Age Calculator
Tire made month and replace date from DOT.
Tire Load Index Calculator
Minimum tire load index from axle weight.
Tire Pressure Calculator
Cold equivalent pressure and fill advice from gauge and temps.
Tire Size Comparison Calculator
Diameter, difference percent, and speedometer error between two tire sizes.
Tire Tread Depth Calculator
Tread reading with replace advice in 32nds or mm.
Transit Card Rides Calculator
Turn card balance and fare into full rides left, leftover, and next ride need.
Tree Height Calculator
Tree height from distance and clinometer angle.
Unit Price Calculator
Compare two grocery packs by price per pound or kilo to find the deal.
US Daylight Saving Dates Calculator
Spring forward and fall back dates for any year 2007 to 2100.
Week Number Calculator
ISO week number, day of year, and days left for any date.
Wind Chill Calculator
Feels like temperature from air temp and wind speed, with frostbite guidance in F and C.
Workdays Calculator
Business days between two dates, with weekends counted separately.