Tools Directory

Client-side calculators. No data leaves your device. No accounts required. Bookmark them.

Allocate hours into deliberate 90-minute blocks.

Calculate total focused time and breaks.

Calculate accumulated sleep deficit over a week.

Raw math for weight alteration.

Calculate One Rep Max using the Brzycki formula.

1RM Calculator →

Calculate minimum hydration based on body weight.

Estimate remaining caffeine based on a 5-hour half-life.

Widmark formula for Blood Alcohol Content.

BAC Estimator →

Analyze the impact of missed days on retention probability.

Habit Streak Math →

Calculate metabolic phases based on fasting duration.

Fasting Windows →

Calculate uneven splits without signing up for an app.

Expense Splitter →

Calculate standard mileage deduction.

Visualize time and rate impact on principal.