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Physics
Open tool Rotational Kinetic Energy Calculator
Calculate rotational kinetic energy with guided inputs, visible equations, substituted working, and model assumptions.
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Calculators
Open tool Roth Conversion Calculator
Estimate tax on a retirement-account conversion at an entered rate.
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Image Tools
Open tool Rounded Corner Maker
Create transparent rounded corners in PNG output.
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Calculators
Open tool Rule of 72 Calculator
Compare Rule-of-72 and exact annual-compounding doubling times.
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Calculators
Open tool Running Cadence Calculator
Convert a timed step count into running steps per minute.
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Health & Wellness
Open tool Running Pace Calculator
Create a bounded, browser-local running pace calculator with visible assumptions, review guidance, and downloadable output.
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Finance & Business
Open tool SaaS Burn Multiple Calculator
Compare positive net cash burn with matching positive net new ARR.
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Finance & Business
Open tool SaaS Magic Number Calculator
Annualize sequential subscription-revenue change against prior sales expense.
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Calculators
Open tool Safe Withdrawal Rate Calculator
Estimate annual spending supported by a portfolio at a selected rate.
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Calculators
Open tool Salary to Hourly Calculator
Convert annual salary to hourly, weekly, and monthly gross equivalents.
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Ecommerce & Marketplace
Open tool Sale Price Planner
Create a bounded, editable sale price planner from supplied merchant data with transparent rules and commerce safeguards.
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Finance & Business
Open tool Sales Commission Planner
Model a transparent two-tier sales commission and accelerator scenario.