One page. One job. Done.
Useful one-page tools for real work
ToolPatch is a growing collection of focused utilities and practical workflow toolkits. Each page handles one task with clear inputs, fast results, and usable outputs.
Toolkits for common workflows
Start with a workflow when the job spans several small tools, assumptions, or handoff steps.
Startup Unit Economics Toolkit
Build, stress-test, and communicate your core economics in one workflow.
Network Troubleshooting Toolkit
Diagnose addressing, DNS, and transport bottlenecks quickly.
Lab and Chemistry Calculations Toolkit
Plan solution preparation, dilution, gas-law, reaction-yield, and pH checks with visible chemistry assumptions.
Project Delivery Planning Toolkit
Forecast schedule and delivery risk using practical PM metrics.
Engineering Field Calcs Toolkit
Fast first-pass engineering calculations for site and workshop decisions.
Chart Generators Toolkit
Choose the right chart generator for radar, spider, radial, Gantt, Sankey, bubble, Pareto, funnel, waterfall, trend, comparison, and distribution views.
Marine Navigation Calculators Toolkit
Use practical marine navigation calculators for CPA/TCPA, under-keel clearance, tide windows, route distance, set and drift, fuel range, ETA, anchoring, COLREGs encounter checks, and vessel turning estimates.
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Featured tools
A curated starting set; the complete directory remains crawlable.
Finance & Business
Featured
Compound Interest Calculator
Forecast investment growth with compounding and recurring contributions.
Estimate how savings and investments can grow over time using compound interest. Enter your starting amount, expected annual return, time horizon, compounding frequency, and optional yearly contributions. This calculator helps freelancers, families, and founders run fast scenarios without opening a spreadsheet. Use it to compare contribution plans, test different return assumptions, and set realistic long-term targets. Tip: run conservative, expected, and aggressive scenarios to understand a full range of outcomes before making financial decisions.
Finance & Business
Featured
Break-Even Calculator
Calculate break-even units and revenue with fixed and variable cost inputs.
Understand exactly how many units you need to sell to cover costs and when you start generating profit. Enter fixed costs, variable cost per unit, and price per unit. Add a target profit to estimate your next milestone.
Finance & Business
Featured
Loan Calculator
Calculate monthly payments and total interest for loans.
Compute monthly loan payments, total interest paid, and amortization details based on principal, interest rate, and term.
Finance & Business
Featured
UTM Link Builder
Generate campaign links with consistent UTM naming standards.
Build clean, trackable campaign URLs with source, medium, campaign, and optional term/content fields. Enforce naming conventions to improve analytics quality. Ideal for growth marketers running multi-channel campaigns who need fast and consistent tagging.
Data & Statistics
Featured
CSV Cleaner
Clean rows, normalize columns, and remove duplicates quickly.
Upload or paste CSV content to detect duplicate rows, empty records, and inconsistent formatting. Normalize headers, trim whitespace, and export a cleaned file in one flow. Useful for marketing, operations, and analytics teams before importing data into other systems.
Developer & Network
Featured
JSON Diff Viewer
Compare two JSON objects and highlight differences.
Side-by-side JSON comparison with color-coded additions, deletions, and modifications.
Developer & Network
Featured
Subnet Calculator
Calculate network, broadcast, host range, and mask details from CIDR.
Analyze IPv4 subnets quickly for network planning, lab setup, and infrastructure troubleshooting.
Marine & Navigation
Featured
CPA/TCPA Risk Calculator
Compute closest point of approach and time to CPA with risk banding.
Calculate CPA and TCPA from ownship and target kinematics using relative motion vectors. Useful for watchstanding support and collision-risk triage when evaluating multiple contacts.
Conversion
Featured
Power Unit Converter
Convert between PS, HP, BHP, and kW power units.
Convert engine and motor power ratings across PS, HP, BHP, and kW with quick all-unit output.
Engineering & Power
Featured
Gauge + Barometric to Absolute Pressure Calculator
Convert gauge and barometric pressure to absolute pressure.
Calculate absolute pressure from gauge and barometric readings: P_abs = P_gauge + P_barometric.
Engineering & Power
Featured
Vertical Cylindrical Tank Contents Calculator
Calculate liquid volume in vertical cylindrical tanks.
Compute liquid volume from height in vertical cylindrical tanks using V = πr²h. Perfect for water tanks and storage vessels.
Science & Math
Featured
Flywheel Energy Calculator
Calculate kinetic energy stored in a rotating flywheel.
Determine the kinetic energy stored in a flywheel based on its moment of inertia and angular velocity, or derived from its shape, mass, radius, and RPM.