About
ProvenCalc is a small suite of free calculators for investing risk, health, dates, and travel — position size, Kelly criterion, drawdown recovery, risk/reward, TDEE, protein intake, days between dates, an eSIM data estimator, and a Japan trip cost + JR Pass calculator. Every page loads instantly, works on a phone, shows the formula and sources under the result, and has no sign-up, popups, or cookie banners.