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Coffee
Specialty Coffee Brew Ratio & Extraction Tool
Dial in your perfect cup — calculate brew ratios, water temperature, and extraction yield for any brew method.
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Showing 6 tools · 1 live · 5 coming soon
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FinanceComing Soon
Freelance Rate & Change Order Calculator
Calculate your hourly rate, project fees, and generate change order estimates with tax and markup built in.
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3D PrintingComing Soon
3D Printing Filament & Power Cost Estimator
Estimate filament usage, electricity costs, and total print cost for any FDM print job in seconds.
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SaaSComing Soon
SaaS Churn & LTV Calculator
Model monthly/annual churn rates, customer lifetime value, and revenue impact to make data-driven retention decisions.
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FinanceComing Soon
Electricity Cost Calculator
Estimate monthly and annual electricity costs for any device or appliance by wattage and usage hours.
Not deployed yet
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ProductivityComing Soon
Project Deadline & Sprint Planner
Break down project timelines, set sprint boundaries, and calculate delivery dates accounting for weekends and holidays.
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Why Use Run The Math?
Built for speed, privacy, and zero friction.
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100% Free, Forever
No subscriptions, no paywalls. Every tool on Run The Math is and will always be free to use.
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Zero Sign-up Required
No accounts, no email collection. Open a tool and start working immediately.
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Privacy-First & Client-Side
All calculations run in your browser. Your data never touches our servers — guaranteed.
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Pick a tool above and get your answer in seconds. No fluff, no fuss.
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