ToolNook

All 22 free tools

Every tool on ToolNook, grouped by what it does. Nothing here needs an account.

Each page is self-contained: the calculation runs in your browser, the formula and a worked example are written out underneath, and common questions are answered at the bottom. Pick a category below, or readwhat ToolNook is.

Calculators (16)

  • Aquarium Volume Calculator – Work out gallons, litres and filled weight for rectangular, cylinder, bow-front, hex and corner tanks.
  • Board Foot Calculator – Total board feet and cost for a cutlist, plus a log scale for rough logs.
  • Business Days Calculator – Count business days between two dates, or add/subtract business days from a deadline — with US federal holidays.
  • Coffee Ratio Calculator – Dial in the perfect coffee-to-water ratio for pour-over, French press, AeroPress, cold brew, espresso and more.
  • Concrete Calculator – Concrete calculator for slabs, footings, round columns and stairs — cubic yards and premix bags.
  • Countdown Calculator – Count down to any date and time, with totals in weeks, days, hours and business days — shareable by link.
  • Dilution Calculator – Solve C1V1 = C2V2, work out dilution ratios, and plan serial dilution series.
  • Fabric Calculator – Fabric calculator for curtains, yardage for any project, and yard/metre unit conversion.
  • Golf Handicap Calculator – World Handicap System index from your last 20 rounds, plus course handicap for today's round.
  • Overtime Pay Calculator – Overtime pay calculator with taxes: enter your hours and rate to see regular pay, OT pay, gross and estimated take-home.
  • Prorated Rent Calculator – Work out partial-month rent for a mid-month move-in or move-out, compared across three proration methods.
  • Quilt Backing and Binding Calculator – Quilt backing, binding and border yardage from your quilt top size.
  • Running Pace Calculator – Solve pace, time or distance, get splits and a race-time predictor for any distance.
  • Sourdough Calculator – Baker's-percentage sourdough calculator with true hydration, recipe scaling and a levain build helper.
  • Time Card Calculator – A weekly time card calculator with lunch break deductions, overtime and pay totals.
  • Tire Size Calculator – Tire size calculator comparison: diameter, circumference, speedometer error and ride height between two tire sizes.

Generators (3)

  • Cron Expression Generator – Build a cron schedule with dropdowns and see it explained in plain English.
  • Favicon Generator – Turn an image or a couple of characters into every favicon size you need, plus a real favicon.ico.
  • Signature Generator – Type your name in a cursive signature font, or draw your own, and download it as a transparent PNG.

Text tools (2)

  • Reverse Text Generator – Reverse characters, words, lines, or flip your text upside down and mirrored — all at once.
  • Syllable Counter – Count syllables per word and per line, live, with a built-in haiku (5-7-5) check.

Converters (1)

  • CSV to JSON Converter – CSV to JSON converter and formatter that runs fully in your browser, plus JSON to CSV.