Mini Tools Collection
Useful one-page tools for real work
ToolPatch is a growing collection of focused utilities. Each page handles one task with clear inputs, fast results, and practical outputs.
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Finance
Featured
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
Featured
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
Featured
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
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
Featured
Mortgage Calculator
Estimate monthly mortgage payments, total paid, and interest.
Calculate fixed-rate mortgage payments from principal, APR, and term.