actonnagecalc.com is one of 35 independent tools built and maintained by the same maker. Each does a single job well, runs in your browser, and works without an account.
✓ In-browser first — wherever technically possible, your data is processed locally and never uploaded.
✓ No accounts, no paywalls — every tool is fully usable the moment the page loads, supported by unobtrusive advertising.
✓ Published methodology — calculators show their formulas and assumptions, so you can check the math instead of trusting it.
thesquarefootagecalculator.com
Area, flooring and material calculators for any space.
→↗bestpercentagecalculator.net
Every percentage problem: increase, decrease, of, change.
→↗theagecalculator.net
Exact age, birthday twins, and date-difference tools.
→↗calculatehours.net
Time between clock-ins, timesheets, and work hours.
→↗clockwithus.com
Current time across cities and time zones.
→↗unitcheatsheet.com
Fast unit conversions with printable reference sheets.
→↗boxvolumecalculator.com
Volume, dimensions and capacity for boxes and containers.
→↗girthcalculator.com
Parcel girth for shipping plus fitness measurements.
→↗calorieskit.com
TDEE, calorie and macro calculators with honest activity inputs.
→totalinterestcalc.com
Mortgage and loan true-cost calculators with live market rates.
→↗marginvsmarkup.com
Pricing calculators that keep margin and markup straight.
→↗indiaemi.com
Loan EMI, eligibility and amortization for Indian borrowers.
→↗dimweightcalc.com
Dim weight across 17 carriers — know your billable weight.
→↗prosolarcalc.tools
Solar sizing, savings and payback estimators.
→↗voltdropcalc.com
Electrical voltage drop, wire sizing and NEC references.
→base64decode.tools
Encode and decode Base64 text and files in the browser.
→↗urlencodedecode.com
Percent-encoding for URLs, queries and components.
→↗www.uuidcore.com
Bulk UUID/GUID generation, all versions.
→↗jsontools.tools
Format, validate, repair and explore JSON with a tree view.
→↗hashgenerator.tools
MD5, SHA-1/256/512 and more, computed client-side.
→↗epochtime.tools
Unix timestamps to dates and back, with code snippets.
→↗crontabsheet.com
Cron expressions explained, built and validated.
→↗regexguide.com
Learn, test and reference regular expressions.
→↗transformcase.com
Convert text between cases: camel, snake, title and more.
→↗textrepeat.net
Repeat and join text patterns for testing and content.
→↗colorcodekit.com
OKLCH-native color tokens, palettes and WCAG contrast.
→↗cidrcalculator.net
CIDR blocks, ranges and subnet math for network engineers.
→↗subnetmaskcalc.net
Subnetting, masks and host ranges with code examples.
→wordcounterfree.com
Words, characters, sentences and reading time, instantly.
→↗passwordstrength.net
Test password strength locally — nothing is transmitted.
→↗pictoolkit.com
Privacy-first image converting, resizing and editing.
→↗removemetadata.tools
Strip EXIF and metadata from files entirely in-browser.
→↗corepdftools.com
Merge, split, compress and convert PDFs client-side.
→↗barcodeandqr.com
Generate barcodes and QR codes with PDF export.
→Have an idea for a tool that should exist? Suggest it — several of the sites above started as visitor requests.