NPV Calculator: Net Present Value, IRR and Payback
Calculate net present value, IRR, simple payback and discounted payback from an equally spaced series of cash flows.
Waist-to-Hip Ratio Calculator: WHR and Waist-to-Height
Calculate waist-to-hip ratio and waist-to-height ratio in centimetres or inches, with optional WHO WHR and half-height comparisons.
Pregnancy Weight Gain Calculator: BMI, Current Gain and Range
Calculate prepregnancy BMI, current weight gain, the CDC total gain range and the corresponding end-of-pregnancy weight range for one baby or twins.
Debt-to-Income Calculator: Front-End, Back-End and Payment
Calculate housing and total debt-to-income ratios from gross income and required monthly payments, then test a proposed payment against an editable target.
Body Surface Area Calculator: Mosteller, Du Bois and Haycock
Calculate body surface area from height and weight with the Mosteller, Du Bois and Haycock formulas, metric or US units, and a clear method comparison.