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Complete ToolPatch tools directory
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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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
Annuity Payment Calculator
Calculate monthly loan payment, total paid, and interest.
Estimate annuity-style payment schedules for mortgages, auto loans, and other fixed-term debt.
Finance & Business
CAGR Calculator
Calculate compound annual growth rate between two values over time.
Use CAGR to compare investment or revenue growth trends consistently over multiple years.
Finance & Business
Cash Runway Calculator
Estimate startup runway and projected cash balance over time.
Forecast how long your current cash lasts based on burn rate, revenue, and growth assumptions. This tool helps founders and finance leads model survival scenarios and plan fundraising or cost adjustments with clear time-based outputs.
Finance & Business
Churn Impact Simulator
Project customer count and MRR under churn and acquisition assumptions.
Model how churn and new customer acquisition affect your customer base and recurring revenue over 12 months. Useful for SaaS operators prioritizing retention initiatives and board-level planning.
Finance & Business
Conversion Rate Calculator
Calculate conversion rate, AOV, and revenue per visitor.
Analyze website performance with conversion rate, average order value, and revenue per visitor metrics.
Finance & Business
Customer Lifetime Value Calculator
Calculate total customer value over their lifetime.
Compute CLV from average purchase value, frequency, and customer lifespan.
Finance & Business
Debt Payoff Calculator
Estimate months to pay off debt and total interest cost.
Model payoff timelines from balance, APR, and monthly payment assumptions. Great for personal budgeting and debt reduction planning.
Finance & Business
Discount Calculator
Compute discount amount, post-discount price, and final total with tax.
Useful for retail pricing, promotions, and quick checkout math.
Finance & Business
Mortgage Calculator
Estimate monthly mortgage payments, total paid, and interest.
Calculate fixed-rate mortgage payments from principal, APR, and term.
Finance & Business
Pricing Tier Designer
Model tier pricing and customer mix to forecast monthly and annual revenue.
Build a quick revenue model across Starter, Growth, and Scale tiers with customer counts and plan prices. This helps product and GTM teams pressure-test pricing strategy before experiments or launches.
Finance & Business
Profit Margin Calculator
Compute profit, margin, and markup from revenue and cost.
Quick check for profitability, pricing discussions, and target planning.
Finance & Business
ROI Calculator
Calculate Return on Investment and annualized returns.
Compute ROI percentage, net profit, and annualized returns for investment analysis.
Finance & Business
Savings Goal Calculator
Find required monthly savings contribution to reach a target goal.
Plan a target amount with current savings, time horizon, and expected return.
Finance & Business
Tip Calculator
Calculate tip amount, total bill, and per-person split.
Quickly split restaurant bills with configurable tip percentage and party size.