Compare scenarios
Most calculators become more useful when you run at least two cases: conservative and expected.
100 tools
All Tools
Browse every calculator and utility in one place. Start with the category that matches what you need right now, then open individual tools for formulas, examples, and related links.
Choosing a tool
Start with the decision, not the calculator name
The library is grouped by the type of work you are doing. Use business tools for pricing and operating math, finance tools for planning estimates, SaaS tools for recurring-revenue metrics, developer tools for formatting and conversion, hosting tools for infrastructure planning, and security tools for implementation checks.
Read the caveats
Each tool page explains when the result should be treated as a rough estimate or checked elsewhere.
Follow related tools
Related links connect adjacent questions such as price, margin, break-even, and ROI.
16 tools
Business
Use these tools to price products, check margins, estimate break-even volume, and plan inventory with numbers you can verify quickly.
Business calculators are most useful when they turn a rough commercial question into a small model you can challenge. Start with the metric that controls the decision, then compare a conservative case with a more optimistic case before changing price, spend, or stock levels.
Check unit economics before changing priceTranslate fixed costs into a sales targetKeep inventory planning tied to demand
ROI Calculator
Estimate return on investment from a projected gain and the cost required to generate it.
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Break-Even Calculator
Calculate how many units you need to sell to cover fixed costs at a given price and variable cost per unit.
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Gross Margin Calculator
Work out gross margin from revenue and direct cost of goods or delivery costs.
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Markup Calculator
Calculate markup percentage from cost and selling price to check whether pricing covers margin targets.
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Discount Calculator
Find the discount percentage, savings amount, and final price from an original price and sale price.
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Profit Margin Calculator
Measure profit margin from revenue and total costs to see how much of each sales dollar is left as profit.
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Contribution Margin Calculator
Calculate contribution margin per unit to see how much each sale contributes toward fixed costs and profit.
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Revenue Growth Calculator
Calculate the percentage change between a previous revenue figure and the current one.
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Sales Commission Calculator
Calculate commission earnings from total sales, commission rate, and optional base pay.
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Average Order Value Calculator
Calculate average order value from total revenue and total orders.
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Average Selling Price Calculator
Measure the average selling price per unit from total revenue and units sold.
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Conversion Rate Calculator
Calculate conversion rate from total visitors or leads and the number of completed conversions.
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Inventory Turnover Calculator
Measure how often inventory is sold and replenished over a period using cost of goods sold and average inventory.
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Reorder Point Calculator
Estimate the inventory level that should trigger a new purchase order based on demand, lead time, and safety stock.
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Safety Stock Calculator
Estimate a buffer inventory level using average and maximum demand alongside average and maximum lead time.
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Economic Order Quantity Calculator
Estimate the order quantity that balances ordering costs against annual holding costs.
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16 tools
Finance
Use these calculators to compare loan payments, savings targets, interest scenarios, and debt ratios with straightforward formulas and plain-language explanations.
Finance calculators on Utiluno are for transparent planning estimates, not regulated financial advice. They work best when you use them to compare scenarios, inspect the formula, and then verify important decisions with the lender, provider, or qualified adviser involved.
Compare payment pressureModel savings and compoundingUse ratios as screening signals
Loan Payment Calculator
Estimate the fixed periodic payment on an amortizing loan using principal, interest rate, and term length.
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Amortization Calculator
See how a fixed-payment loan breaks into principal and interest over time, including the remaining balance after a chosen number of payments.
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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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Savings Goal Calculator
Estimate how much needs to be saved each month to reach a target balance by a chosen deadline.
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Simple Interest Calculator
Calculate interest earned or owed when interest is based only on the original principal, not on prior interest.
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Future Value Calculator
Estimate the future value of a lump sum invested or saved over time at a chosen annual rate.
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Present Value Calculator
Discount a future amount back to today's value using an assumed annual rate and time horizon.
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Debt-to-Income Calculator
Calculate the share of gross monthly income that goes toward recurring debt obligations.
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Loan-to-Value Calculator
Measure how large a loan is relative to the value of the asset securing it.
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Debt Payoff Calculator
Estimate how long it will take to pay off a single debt balance given the rate and a fixed monthly payment.
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APR to APY Calculator
Convert a nominal annual percentage rate into an effective annual yield using a chosen compounding frequency.
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APY to APR Calculator
Convert an effective annual percentage yield into the nominal annual percentage rate for a chosen compounding frequency.
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Emergency Fund Calculator
Estimate the size of an emergency fund based on monthly essential expenses and the number of months you want to cover.
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Retirement Savings Calculator
Project retirement savings growth from a starting balance, recurring contributions, annual return, and years until retirement.
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Rule of 72 Calculator
Estimate how long it takes to double money at a given annual growth rate using the Rule of 72 shortcut.
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Annuity Payout Calculator
Estimate a fixed periodic payout that can be sustained from a starting balance over a chosen term and assumed annual return.
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18 tools
SaaS
Use these tools to work through recurring revenue, churn, CAC, LTV, payback, and reporting metrics without rebuilding the same spreadsheet each time.
SaaS metrics are useful only when definitions stay consistent. Utiluno's SaaS calculators focus on recurring revenue, retention, acquisition efficiency, and runway-style planning so teams can sanity-check reporting before sharing numbers with operators, boards, or investors.
Keep revenue metrics consistentConnect acquisition to paybackReview efficiency before planning growth
MRR Calculator
Calculate monthly recurring revenue from active subscriptions and average recurring price.
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ARR Calculator
Annualize recurring monthly revenue to estimate annual recurring revenue.
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ARPU Calculator
Calculate average revenue per user from recurring revenue and the total number of active paying users.
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ARPA Calculator
Calculate average revenue per account from recurring revenue and the number of paying accounts.
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Subscription Churn Rate Calculator
Calculate customer churn rate from the number of customers lost during a period and the starting customer base.
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Customer Retention Calculator
Calculate the percentage of starting customers retained after accounting for new customers added during the period.
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LTV Calculator
Estimate customer lifetime value from ARPA, gross margin, and churn rate.
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CAC Calculator
Calculate customer acquisition cost from sales and marketing spend divided by the number of new customers acquired.
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LTV:CAC Calculator
Compare estimated lifetime value against customer acquisition cost to measure unit economics efficiency.
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CAC Payback Calculator
Estimate how many months it takes to recover customer acquisition cost from gross-margin-adjusted monthly recurring revenue.
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Net Revenue Retention Calculator
Calculate how recurring revenue from an existing cohort changes after expansion, contraction, and churn.
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Gross Revenue Retention Calculator
Calculate how much recurring revenue from an existing cohort is retained before counting any expansion revenue.
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SaaS Quick Ratio Calculator
Measure how much new and expansion recurring revenue offsets churn and contraction.
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SaaS Magic Number Calculator
Estimate sales efficiency by comparing annualized new recurring revenue produced this quarter against the prior quarter's sales and marketing spend.
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Burn Multiple Calculator
Compare net burn to net new ARR to gauge how efficiently a company is converting cash burn into recurring revenue growth.
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Rule of 40 Calculator
Add revenue growth rate and profit margin to check a common SaaS balance-of-growth benchmark.
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Trial-to-Paid Conversion Calculator
Measure the percentage of trial users or accounts that convert into paid customers.
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Freemium Conversion Calculator
Measure the percentage of free users or accounts that upgrade into paid plans.
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17 tools
Developer
Use these utilities to encode, decode, format, convert, and inspect common values you run into while building, debugging, and documenting software.
Developer utilities are built for quick inspection and formatting tasks that interrupt implementation work. They are intentionally narrow: paste a value, transform it, inspect the output, and copy the result without sending the main input to a backend for calculation.
Format data before debuggingTranslate values between systemsPrepare implementation snippets
Base64 Encoder
Encode plain text into Base64 for transport, embedding, or debugging workflows.
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Base64 Decoder
Decode a Base64 string back into readable plain text for debugging or inspection.
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URL Encoder
Percent-encode text for safe use inside query strings, paths, or redirect parameters.
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URL Decoder
Decode percent-encoded text back into a readable URL segment or query value.
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Hash Generator
Generate a cryptographic hash from plain text using common SHA algorithms.
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JWT Expiration Viewer
Decode a JSON Web Token payload and inspect its issued-at and expiration timestamps without sending the token anywhere.
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Cron Expression Explainer
Parse a standard cron expression and turn it into a plain-English schedule explanation.
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JSON Formatter
Pretty-print raw JSON into readable, indented output for debugging, documentation, or handoff work.
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JSON Minifier
Compress formatted JSON into a compact one-line string for payloads, fixtures, or transport.
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Unix Timestamp Converter
Convert a Unix timestamp into a readable date or turn a date into a Unix timestamp for debugging and integration work.
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Response Time Converter
Convert response times between microseconds, milliseconds, seconds, and minutes.
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Time Duration Calculator
Convert a time duration into alternate units and summarize the same length of time in a more readable form.
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File Size Converter
Convert storage sizes between bytes, KB, MB, GB, and TB using consistent binary scaling.
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Data Transfer Converter
Convert throughput or transfer values between bits, bytes, and their larger units.
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Regex Escape Tool
Escape special regular-expression characters in plain text so the string can be used literally in a regex pattern.
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UUID Validator
Validate whether a string looks like a UUID and identify the version when possible.
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URL Slug Generator
Turn a title or phrase into a clean, lowercase URL slug suitable for paths and content publishing.
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17 tools
Hosting
Use these calculators to estimate bandwidth, storage, uptime budgets, request volume, and infrastructure cost with inputs you can adjust quickly.
Hosting and infrastructure estimates are planning aids for capacity, cost, and reliability conversations. They are most useful when you combine traffic assumptions with provider billing details instead of treating a single average as a complete forecast.
Estimate usage before choosing a planPlan reliability budgetsCompare retention and backup scenarios
Bandwidth Calculator
Estimate monthly data transfer from average page weight and monthly visits.
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Cloud Storage Cost Calculator
Estimate monthly storage cost from stored gigabytes and the provider's per-GB monthly rate.
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CDN Cost Calculator
Estimate CDN bandwidth cost from monthly transfer volume and per-GB delivery pricing.
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Egress Cost Calculator
Estimate data egress cost from transferred gigabytes and your provider's per-GB egress rate.
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Uptime Percentage Calculator
Calculate uptime percentage from total downtime over a selected period.
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SLA Downtime Calculator
Turn an uptime target such as 99.9% into the maximum downtime allowed over a day, week, month, or year.
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Object Storage Request Cost Calculator
Estimate object storage request cost from GET and PUT volume and provider request pricing.
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Monthly API Request Calculator
Estimate monthly API request volume from daily active users and requests per user per day.
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Backup Retention Calculator
Estimate backup storage volume from backup size, frequency, and retention period.
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Log Storage Calculator
Estimate retained log volume from daily log generation, compression ratio, and retention period.
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Database Storage Calculator
Estimate database storage footprint from row count, average row size, and index overhead.
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Container Resource Calculator
Estimate total reserved CPU and memory from per-container limits and replica count.
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Email Send Cost Calculator
Estimate email delivery cost from monthly send volume and provider pricing per 1,000 emails.
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DNS TTL Converter
Convert DNS TTL values between seconds, minutes, hours, and days.
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TLS Certificate Validity Calculator
Calculate the number of days between a certificate issue date and expiration date.
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Cache Hit Ratio Calculator
Calculate cache hit ratio from cache hits and total requests.
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Rate Limit Budget Calculator
Translate a requests-per-second rate limit into daily, weekly, and monthly request budgets.
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16 tools
Security
Use these tools to check entropy, inspect tokens, work through CIDR math, generate headers, and handle common security-related implementation tasks faster.
Security utilities on Utiluno focus on implementation support: entropy estimates, tokens, network ranges, headers, and encoding helpers. They can improve day-to-day checks, but they do not replace threat modeling, code review, audits, or organization-specific security requirements.
Check implementation detailsReason about entropy and lifetimeInspect network ranges
Password Entropy Calculator
Estimate password entropy from length and character set assumptions.
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Bcrypt Cost Estimator
Estimate the relative work factor increase created by changing bcrypt cost rounds.
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HMAC Generator
Generate an HMAC signature from a message, secret, and algorithm in the browser.
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CIDR Subnet Calculator
Inspect an IPv4 CIDR block and calculate its subnet mask, network address, broadcast address, and usable host range.
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Subnet Mask to CIDR Converter
Convert an IPv4 subnet mask into its CIDR prefix length.
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IP Range Calculator
Calculate the size of an IPv4 range between a starting IP address and an ending IP address.
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Base64URL Encoder
Encode text into URL-safe Base64 using the Base64URL character set used by JWTs and other web-safe formats.
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Base64URL Decoder
Decode a Base64URL string into readable plain text.
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Basic Auth Header Generator
Generate the HTTP Basic Authorization header value from a username and password.
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HSTS Max-Age Converter
Convert HSTS max-age values between seconds and longer time units for easier policy review.
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Session TTL Calculator
Convert session lifetime settings into multiple time units and calculate expiry from a duration.
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Random Token Generator
Generate a cryptographically random token in hex, Base64URL, or UUID-style formats.
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API Key Entropy Calculator
Estimate the entropy of an API key format from its length and character set size.
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Password Generator
Generate a random password with configurable length and character set options.
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SRI Hash Generator
Generate a Subresource Integrity hash string from script or style content.
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CSP Nonce Generator
Generate a random Content Security Policy nonce value for inline script or style allowlisting.
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