All tools
151 tools available
Mortgage Payoff Calculator
See how extra payments shorten your mortgage and save interest.
Add Border to Image
Add a solid color border of any thickness to your image.
House Affordability Calculator
Estimate how much house you can afford based on income and debts.
Weight Unit Converter
Convert between milligrams, grams, kilograms, ounces, pounds and metric tons.
kWh Calculator
Estimate the electricity cost of running an appliance.
Time Zone Converter
Convert a time from one UTC offset to another.
Percentage Calculator
Three-in-one percentage calculator: find X% of Y, what % X is of Y, or percent change.
JPG to PNG Converter
Convert JPG/JPEG images to lossless PNG in one click.
Simple Interest Calculator
Calculate simple interest and total repayment for a fixed principal and rate.
Conception Calculator
Estimate the likely conception date from your due date or last period.
Inflation Calculator
See what an amount of money is worth today after years of inflation.
Subnet Calculator
Calculate network address, broadcast address and host range from an IP and CIDR.
CD Calculator
Calculate the maturity value of a certificate of deposit.
Sleep Calculator
Find the best bedtime or wake time based on 90-minute sleep cycles.
BTU Calculator
Estimate the BTU heating/cooling capacity needed for a room.