Everyday calculators that show their work
No sign-up, no app. Every calculator explains the formula and source it uses.
Calculators
- Dog Age CalculatorDog and cat age in human years, by size
- One Rep Max Calculator1RM from weight and reps, with a % chart
- Tire Size CalculatorDiameter, sidewall and speedometer error
- Random Username Generator10 usernames at a time, with your word
- Sleep Cycle CalculatorWhen to sleep or wake in 90-minute cycles
- Running Pace CalculatorPace, finish time and race predictions
- Subnet Mask CalculatorCIDR or mask to host range and count
- Decimal to Fraction CalculatorDecimals to fractions, and fraction math