A small tool.
For your next big thing.
125 practical helpers for the calculations, cleanups, and little tasks between you and getting on with it.
125 tools ready to use
Discount profit
See how a sale changes profit and required sales volume.
Open toolBreak-even ROAS
Find the advertising return required to cover product and fulfillment costs.
Open toolBundle pricing
Price a bundle without destroying margin.
Open toolFree shipping threshold
Choose a shipping threshold that leaves adequate contribution.
Open toolFreelance rate
Set a rate covering income goals and nonbillable time.
Open toolLanded cost
Allocate freight and other shipment costs across inventory.
Open toolReturns & refunds
Estimate expected profit loss from returns or returnless refunds.
Open toolMulti-product break-even
Calculate sales targets for a mixed product portfolio.
Open toolContribution margin
Find contribution per sale after variable costs.
Open toolProject payments
Split project pricing into upfront and milestone payments.
Open toolBulk UTM builder
Create hundreds of consistent campaign URLs from a table.
Open toolYouTube chapters
Turn supplied timestamps and titles into valid chapter text.
Open toolSearch Console insights
Find high-impression pages or queries with weak clicks from exported reports.
Open toolCSV repair
Fix semicolon/comma/tab files that import incorrectly.
Open toolCompare lists
Find overlap, missing entries, or unique items.
Open toolEmail list cleaner
Remove duplicate entries, whitespace and obviously malformed addresses.
Open toolDMARC report reader
Upload DMARC XML and inspect sending sources and authentication results.
Open toolEmail header analyzer
Paste raw headers to diagnose routing delays and authentication evidence.
Open toolImage compressor
Fit photos under an upload limit.
Open toolRobots.txt tester
Paste robots.txt and test whether specified URLs are allowed for a crawler.
Open toolSPF checker
Inspect a domain's SPF syntax and recursively count DNS-triggering terms.
Open toolDMARC checker
Create a policy record and inspect an existing record's syntax.
Open toolDKIM checker
Check a supplied selector and domain for a usable DKIM DNS record.
Open toolSubject & preheader
Preview supplied newsletter subject and preheader combinations.
Open toolEmail signature
Create a copyable signature with contact links and a layout preview.
Open toolCash runway
Estimate how long current cash lasts.
Open toolCAC payback
Estimate months or orders needed to recover acquisition cost.
Open toolHiring runway
See how a planned hire changes monthly cash and runway.
Open toolSitemap validator
Check an uploaded sitemap and split oversized files into an index.
Open toolJSON to CSV
Export nested records into spreadsheet columns.
Open toolProfit margin and target-price
Compute margin and the price needed for a target margin.
Open toolMarkup versus margin
Convert desired markup to margin and vice versa.
Open toolEtsy fee and net profit
Estimate net proceeds for an Etsy order.
Open toolStripe fee and required-charge
Estimate processing fees or charge needed for desired net proceeds.
Open toolPayPal merchant fee
Estimate net receipts from a merchant transaction.
Open toolCash conversion cycle
Measure days cash is tied up in inventory and receivables.
Open toolDays sales outstanding
Estimate collection time for credit sales.
Open toolInventory turnover and inventory days
Measure stock efficiency and days held.
Open toolMRR and ARR movement
Reconcile new, expanded, contracted and churned recurring revenue.
Open toolCustomer and revenue churn
Calculate churn from customer and revenue changes.
Open toolNet and gross revenue retention
Calculate existing-cohort revenue retention with and without expansion.
Open toolCustomer lifetime value and LTV:CAC
Compare modeled customer contribution to acquisition cost.
Open toolROAS and marketing efficiency
Calculate channel ROAS and blended marketing efficiency.
Open toolAverage order value
Calculate average order value and target uplift.
Open toolHreflang tag
Generate reciprocal alternate-language markup from a URL-language table.
Open toolHreflang consistency checker
Validate reciprocal language mappings from uploaded HTML or a CSV.
Open toolBulk meta title and description audit
Inspect an uploaded page/title/description CSV for missing or duplicate metadata.
Open toolSearch Console query overlap analyzer
Compare exported query-page data for queries appearing on multiple pages.
Open toolKeyword list organization and intent tagging
Group a user-supplied keyword list by modifiers and intended page type.
Open toolSocial campaign link QA checker
Audit supplied campaign URLs for inconsistent UTMs, missing fields and naming drift.
Open toolMailto link builder
Create properly encoded email links with recipients, subject and body.
Open toolYouTube timestamp link builder
Create links that start a supplied video at a chosen time.
Open toolYouTube embed code builder
Generate responsive embed markup with supported playback settings.
Open toolYouTube metadata length and formatting checker
Validate pasted video titles, descriptions and tags before uploading.
Open toolYouTube description template builder
Assemble reusable chapters, disclosures, sources and calls to action.
Open toolSERP snippet preview
Preview a supplied page title, URL and description.
Open toolRobots.txt
Build crawl rules and sitemap declarations from a form.
Open toolURL-list sitemap
Turn pasted URLs into downloadable XML sitemap files.
Open toolLocal business structured-data
Create JSON-LD from business details and hours.
Open toolStructured-data markup linter
Check pasted JSON-LD for syntax and common field inconsistencies.
Open toolCanonical consistency auditor
Compare intended canonicals against an uploaded crawl export.
Open toolRedirect chain checker
Trace recorded HTTP redirect chains in a crawl export and identify loops or missing targets.
Open toolInternal broken-link checker
Find internal links with recorded response errors by comparing supplied HTML with a crawl-status export.
Open toolImage alt-text coverage audit
Find missing or suspicious alt attributes in uploaded HTML.
Open toolGoogle review link helper
Turn a supplied business review URL into reusable review-request assets.
Open toolYouTube playlist duration
Estimate playlist viewing time from pasted video durations and a chosen playback speed.
Open toolPDF splitter by page or file size
Break a PDF into parts that fit upload limits.
Open toolManual image blur and redaction
Hide a face or private detail before sharing a photo.
Open toolPixels to inches print
Find printed dimensions from pixels and PPI.
Open toolFractional inches and metric length
Convert feet/inches and fractions into metric lengths.
Open toolData storage unit
Convert bytes, MB/GB, and binary units correctly.
Open toolDownload and upload time
Estimate transfer duration from file size and speed.
Open toolRemove duplicate lines
Clean repeated entries from a pasted list.
Open toolCSV to JSON
Convert spreadsheet rows into structured data.
Open toolJSON formatter and validator
Read messy JSON and locate syntax errors.
Open toolBase64 encoder and decoder
Encode UTF-8 text or decode valid Base64 text.
Open toolURL encoder and decoder
Fix escaped query values and paths.
Open toolMarkdown to HTML
Preview Markdown and export rendered HTML.
Open toolText statistics and character counter
Count words, characters, lines, and reading length.
Open toolAspect ratio and resize
Find a proportional width/height for an image.
Open toolBatch image resizer
Resize many images to consistent dimensions.
Open toolHEIC to JPG
Make phone photos compatible with upload forms.
Open toolWebP to JPG
Turn downloaded WebP images into accepted JPG files.
Open toolImages to PDF
Combine photographed pages into a printable document.
Open toolPDF merger
Combine several PDFs into one.
Open toolPDF page organizer and rotator
Reorder, omit and rotate PDF pages using an explicit page selection.
Open toolImage cropper
Crop an image to precise dimensions or a ratio.
Open toolIngredient-specific cups to grams
Convert recipe volumes into ingredient weights.
Open toolRecipe serving scaler
Resize ingredient quantities for a desired serving count.
Open toolCake pan size
Adjust a recipe to a differently sized baking pan.
Open toolInvestment fee drag comparison
Compare long-term balances under different annual fees.
Open toolCompound interest with increasing contributions
Model growth with periodic contributions and annual increases.
Open toolSavings goal
Find regular contributions needed to meet a target.
Open toolExtra loan payment
Compare payoff time and interest under additional principal payments.
Open toolDebt snowball versus avalanche
Compare repayment orders across multiple debts.
Open toolFixed-rate loan payment
Estimate installment payment and total interest.
Open toolInflation-adjusted purchasing power
Estimate what future money is worth under assumed inflation.
Open toolRefinance break-even
Compare upfront refinance costs to payment and interest changes.
Open toolDays between dates
Measure elapsed days between two dates.
Open toolAdd or subtract days from a date
Find the calendar date before or after a starting date.
Open toolAdult BMI
Calculate adult BMI and the weight interval corresponding to the standard adult BMI reference range.
Open toolBMR and energy
Estimate resting energy with the Mifflin–St Jeor equation and compare a user-selected activity scenario.
Open toolWaist-to-height ratio
Compare waist circumference with height using the same units and explain the adult screening context.
Open toolLength converter
Convert metres, kilometres, centimetres, inches, feet, yards, miles and nautical miles.
Open toolWeight converter
Convert kilograms, grams, pounds, ounces, stones and metric tonnes.
Open toolTemperature converter
Convert Celsius, Fahrenheit and kelvin with explicit absolute-zero boundaries.
Open toolArea converter
Convert square metres, hectares, square feet, acres and other area units.
Open toolVolume converter
Convert litres, millilitres and explicitly labelled US and imperial volume units.
Open toolSpeed converter
Convert kilometres per hour, miles per hour, metres per second, knots and feet per second.
Open toolTime converter
Convert fixed elapsed durations between milliseconds, seconds, minutes, hours, days and weeks.
Open toolData size converter
Compare bits and bytes with explicitly decimal and binary storage units.
Open toolAngle converter
Convert degrees, radians, gradians and turns while retaining signed rotations.
Open toolPressure converter
Convert pascals, kilopascals, bar, standard atmospheres and pounds per square inch.
Open toolEnergy converter
Convert joules, kilojoules, watt-hours, kilowatt-hours and explicitly defined calories.
Open toolFuel economy converter
Convert litres per 100 kilometres, kilometres per litre and US or imperial miles per gallon.
Open toolCSV column mapper
Rename, reorder and select CSV columns, add constants and report missing required values.
Open toolInvoice aging
Group outstanding invoice balances by calendar days overdue and currency.
Open toolCSV key join
Enrich CSV records through a unique lookup key with unmatched-record exports.
Open toolInventory reorder point
Compare unreserved stock with lead-time demand and a chosen buffer.
Open toolText contrast
Compare opaque sRGB text colors with unrounded WCAG contrast thresholds.
Open toolAmount reconciliation
Compare exact keyed monetary amounts with a declared currency and decimal tolerance.
Open toolSubtitle timing
Shift basic SRT or plain WebVTT timings and export supported caption text.
Open toolCalendar event file
Download one non-recurring UTC or all-day iCalendar event.
Open toolUnsubscribe headers
Inspect unsubscribe URI syntax, POST marker and declared DKIM header coverage.
Open toolTLS report reader
Summarize uncompressed SMTP TLS JSON reports and export policy/failure observations.
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Start with a workflow.
A useful order for the tools, with the assumptions along the way.