Free health & finance calculators — plus online tools and games
Free BMI, BMR, body fat, and interest calculators with inflation adjustment — plus an online whiteboard, hardware testers, a realtime clock, IP lookup, and 40+ chess variants from around the world.
Health Calculators
Interest Rate Calculators
All interest calculators support inflation and deflation adjustment for real money value.
Deposit Interest Calculator
Compound growth on savings with inflation adjustment.
InterestLending Rate Calculator
Monthly loan payments and total interest cost.
InterestFixed Interest Calculator
Future value of a fixed-rate investment.
InterestVariable Interest Calculator
Year-by-year variable rates with inflation.
InterestPrime Rate Calculator
Loan cost using prime rate plus spread.
InterestNominal Interest Calculator
Convert real rate to nominal using inflation.
InterestReal Interest Calculator
Fisher equation: real rate from nominal and inflation.
InterestCompound Interest Calculator
Compound growth with inflation-adjusted real value.
Utility Tools
Test your hardware and check your connection — right in the browser.
Keyboard Tester
Test every key on your keyboard with a live visual layout.
ToolsMouse Tester
Test mouse buttons, scroll wheel, and double-click speed.
ToolsRefresh Rate Checker
Measure your display's refresh rate and see the smoothness difference it makes.
ToolsTouch Screen Tester
Draw full-screen with your fingers to find dead zones and test multi-touch.
ToolsDisplay Color Tester
Full-screen colors and gradients to find dead pixels, banding, and burn-in.
ToolsRealtime Clock
Live clock with millisecond precision, stopwatch, and timer.
ToolsWhat Is My IP
See your public IP address and its location on a map.
ToolsOnline Whiteboard
Draw, write, add sticky notes and math formulas on an infinite canvas.
Games
Classic board games from around the world — play against the computer or a friend online.