Health & Fitness calculators
Bra Size calculator
Accurate bra size calculator: measure band & bust.
Age Difference Calculator
Calculate age differences quickly and accurately.
Safe Period Calculator
Our calculator helps you identify your fertile and safe days.
Waist-to-Hip Ratio Calculator
A key predictor of cardiovascular and metabolic health risk
army body fat calculator
The New Army Standard. Calculated Instantly.
Dog Pregnancy Calculator
Estimate your dog’s due date and prepare for the arrival
Lean Body Mass Calculator
Estimate your lean body mass using multiple validated equations.
ERA Calculator
Compute a pitcher’s ERA for games of any length.
dunk calculator
Discover how high you need to jump to touch the rim.
Half-Life calculator
Compute radioactive decay, time to thresholds and more
construction calculators
Stone Calculator
Estimate gravel, crushed stone, and aggregate in cubic yards, metres, and tons.
Concrete Block Calculator
Modern, fast, and accurate, plan your block walls with confidence.