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Yarn Tree Calculator

Calculate exact yarn yardage and number of skeins required for cone craft projects using conical surface area formulas with custom safety margins.
Fly Tying Cost Calculator

Determine the exact cost per fishing fly based on hooks, beads, feathers, thread, vise equipment depreciation, and hourly labor rates.
Calligraphy Ink Calculator

Estimate ink volume in milliliters and bottles needed for wedding envelope addressing and custom lettering projects based on nib width.
Washington DC Paycheck Calculator

Calculate net take-home salary and itemized payroll deductions using 2025 IRS federal tax brackets, District of Columbia progressive tax, and FICA.
eGFR Kidney Calculator

Estimate glomerular filtration rate using the race-free 2021 CKD-EPI creatinine equation and KDIGO chronic kidney disease staging guidelines.

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