B
Business
16 toolsPricing, margin, conversion, and inventory tools for teams that need fast planning answers without a spreadsheet.
Pricing and margin planningInventory and demand managementConversion and order economics
Explore Business100 practical tools · free to use
Fast calculators for
everyday decisions.
Practical calculators and technical tools for pricing, planning, and implementation work. Pricing, margins, loans, SaaS metrics, hosting, encoding, and security — without rebuilding the same spreadsheet again.
100
Practical tools
6
Categories
Free
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Reviewed
April 30, 2026
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F
Finance
16 toolsLoan, savings, and planning tools designed for formula-based estimates rather than regulated advice.
Loan and debt planningSavings and compoundingRatio and return estimates
Explore FinanceS
SaaS
18 toolsRecurring revenue, retention, and efficiency calculators that turn metric definitions into usable operating tools.
Revenue and retention metricsAcquisition efficiency toolsBoard and investor reporting ratios
Explore SaaSD
Developer
17 toolsEncoding, formatting, parsing, and conversion tools for engineers, technical marketers, and support teams.
Encoding and decodingFormatting and parsingTime, size, and text conversions
Explore DeveloperH
Hosting
17 toolsInfrastructure estimators for bandwidth, storage, uptime, backups, and cost planning across modern hosting stacks.
Bandwidth and egress planningStorage and retention estimatesReliability and rate-limit math
Explore HostingS
Security
16 toolsLow-maintenance security and encoding tools for developers, platform teams, and security-conscious operators.
Entropy and token utilitiesNetwork and addressing mathHeader and transport helpers
Explore SecurityPage quality
What each tool page is designed to answer
Utiluno pages are built around a specific calculation or transformation, then supported with context that helps you judge whether the result fits your situation.
Inputs and outputs
Each page explains the values you enter and the result panels you should expect.
Visible method
Formula-based tools show the calculation method instead of hiding the result behind a black box.
Worked example
Example scenarios show inputs, steps, and a plain-language interpretation of the output.
Caveats and next steps
Limitations, related tools, and FAQs help you avoid using a quick estimate outside its useful range.
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Popular tools people come back to
ROI Calculator
Estimate return on investment from a projected gain and the cost required to generate it.
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Loan Payment Calculator
Estimate the fixed periodic payment on an amortizing loan using principal, interest rate, and term length.
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Compound Interest Calculator
Estimate future balance growth from a starting principal, recurring contributions, annual return, and time horizon.
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MRR Calculator
Calculate monthly recurring revenue from active subscriptions and average recurring price.
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LTV:CAC Calculator
Compare estimated lifetime value against customer acquisition cost to measure unit economics efficiency.
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Bandwidth Calculator
Estimate monthly data transfer from average page weight and monthly visits.
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Password Entropy Calculator
Estimate password entropy from length and character set assumptions.
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Why use Utiluno?
Clear formulas
Each tool shows the method behind the answer, so you can verify the numbers instead of treating the output like a black box.
Practical limits
Caveats are included with the calculator content so you can see where a quick estimate stops being enough.
Helpful next steps
If one answer leads to another question, related tools and category pages make it easy to keep going.