Digital Utility Directory
Explore our structured registry of online calculation engines and utilities. Filter by category, search by intent, or preview upcoming roadmap releases.
Australia GST Calculator
Add GST: GST-inclusive price = price × 1.1 Remove GST: GST-exclusive price = total ÷ 1.1 GST included in a total = total ÷ 11
Add 10% GST to a price, or work out the GST included in a total using the 1/11 rule — the quick way for invoices, quotes and receipts.
BMI Calculator
BMI = weight_kg / (height_m)^2 = 703 × weight_lbs / (height_in)^2
Adult and pediatric Body Mass Index calculator supporting Metric and Imperial units with World Health Organization classification thresholds.
Calorie Calculator
Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5 Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161 TDEE = BMR × activity factor (1.2 – 1.9)
Estimate how many calories you burn each day and the intake that fits your goal, using the Mifflin–St Jeor equation.
Canada GST/HST Calculator
Add tax: total = price × (1 + combined rate) Remove tax: price before tax = total ÷ (1 + combined rate) Each tax (GST, PST, QST) is calculated on the price before tax — not on each other.
Add or remove Canadian sales tax for any province or territory — GST, HST, PST, RST and QST — with each tax shown separately. Updated for 2026 rates.
Car Stamp Duty Calculator Australia
Each state uses its own scale — choose the state to see its formula in the result.
Calculate car stamp duty in any Australian state or territory and compare the same car across all of them.
Case Converter
Change text to upper case, lower case, title case, sentence case or programming cases like camelCase and snake_case in one click.
Compound Interest Calculator
A = P(1 + r/n)^(nt) + PMT [ ((1 + r/n)^(nt) – 1) / (r/n) ]
Long-term savings and investment growth projector with daily, monthly, and annual compounding frequencies alongside periodic contribution modeling.
Fraction Calculator
a/b + c/d = (a×d + c×b) / (b×d) a/b − c/d = (a×d − c×b) / (b×d) a/b × c/d = (a×c) / (b×d) a/b ÷ c/d = (a×d) / (b×c) Then divide top and bottom by their greatest common divisor.
Add, subtract, multiply or divide fractions and mixed numbers. Answers are simplified automatically and shown as a mixed number and a decimal.
GPA Calculator
GPA = Σ(Credit Hours_i × Grade Points_i) / Σ(Credit Hours_i)
College and high school Grade Point Average calculator supporting 4.0 standard scales, weighted honors/AP bonus points, and cumulative semester tracking.
Grade Calculator
Current Grade = Σ(Weight_i × Grade_i) / Σ(Weight_i); Required Final = (Target – Current × (1 – FinalWeight)) / FinalWeight
Course weighted grade calculator allowing students to determine overall academic standing and needed scores on final exams.
HECS-HELP Repayment Calculator
2026–27 repayment income (RI): RI ≤ $69,528 → $0 $69,528 < RI ≤ $129,717 → 15% × (RI − $69,528) $129,717 < RI ≤ $186,050 → $9,028 + 17% × (RI − $129,717) RI > $186,050 → 10% × RI
See how much HECS-HELP you repay each year and each pay under the ATO’s 2026–27 marginal repayment system, and compare it with 2025–26.
Hourly to Salary Calculator
Annual pay = hourly rate × hours per week × weeks per year Monthly = annual ÷ 12 · Bi-weekly = annual ÷ (weeks ÷ 2) · Semi-monthly = annual ÷ 24
Turn an hourly wage into yearly, monthly, bi-weekly and weekly pay, or work out the hourly rate behind a salary.
Image Compressor
Shrink JPG, PNG and WebP images by adjusting the quality, with an instant before-and-after size comparison. Files never leave your device.
Image Converter (JPG, PNG, WebP)
Convert images between JPG, PNG and WebP formats — for example WebP to JPG or PNG to WebP — directly in your browser.
Image Resizer
Resize a photo to exact pixel dimensions or by percentage, keep the aspect ratio, and download it as JPG, PNG or WebP — all in your browser.
Length Converter
1 inch = 2.54 cm (exact) 1 foot = 12 inches = 0.3048 m 1 yard = 3 feet = 0.9144 m 1 mile = 1,760 yards = 1.609344 km 1 nautical mile = 1,852 m
Convert between metric and imperial lengths — cm, m, km, inches, feet, yards and miles — with exact conversion factors.
Loan Calculator
M = P [ r(1 + r)^n ] / [ (1 + r)^n – 1 ]
General amortized personal, auto, and student loan payment calculator with total borrowing cost projections and extra payment payoff accelerators.
Mean, Median & Mode Calculator
Mean = Σx ÷ n Median = middle value of the sorted list (average of the two middle values when n is even) Population variance σ² = Σ(x − mean)² ÷ n Sample variance s² = Σ(x − mean)² ÷ (n − 1) Standard deviation = √variance
Paste any list of numbers to find the average (mean), median, mode, range, variance and standard deviation in one step.
Merge PDF
Combine two or more PDF files into a single document, in the order you choose. Files are processed on your device and never uploaded.
Mortgage Calculator
M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
Comprehensive home loan amortization calculator computing monthly principal, interest, property tax, homeowner insurance, and PMI with multi-country loan conventions.
New Zealand GST Calculator
Add GST: total = price × 1.15 Remove GST: price excluding GST = total ÷ 1.15 GST included in a total = total × 3 ÷ 23
Add 15% GST to a price, or find the GST inside a total using the 3/23 fraction used by Inland Revenue.
NSW Car Stamp Duty Calculator
Value up to $45,000: $3 per $100 (or part) of the value Value over $45,000: $1,350 + $5 per $100 (or part) of the value above $45,000 Value = the higher of the price paid and the market value
Work out the motor vehicle stamp duty on a car registered in New South Wales, new or used, with the official rates.
NT Car Stamp Duty Calculator
Duty = $3 per $100 or part of the dutiable value Eligible plug-in EVs (1 Jul 2022 – 30 Jun 2027): no duty on the first $50,000
Work out Northern Territory stamp duty on a new or used car, including the electric vehicle concession.
Ontario HST Calculator
Add HST: total = price × 1.13 Reverse HST: price before tax = total ÷ 1.13 HST in a total = total × 13 ÷ 113 Federal part 5% · Ontario part 8%
Add 13% HST to a price or reverse it out of a total for Ontario. Includes the federal and provincial parts and which items qualify for the 8% rebate.
Password Generator
Entropy (bits) = length × log₂(number of possible characters)
Create strong, random passwords in your browser. Choose the length and character types and see an estimate of how hard each password is to guess.
Pay Calculator Australia
Take-home pay = salary − income tax − Medicare levy − HELP repayment Income tax 2026–27: 0% to $18,200 · 15% to $45,000 · 30% to $135,000 · 37% to $190,000 · 45% above, minus the Low Income Tax Offset (up to $700) Medicare levy: 2% of taxable income (reduced below $35,013)
See your Australian take-home pay after income tax, the Medicare levy and HECS-HELP for 2026–27, per week, fortnight, month or year — from a salary or an hourly rate.
Paycheck Calculator
Net Pay = Gross Pay – Pre-Tax Deductions – Income Tax (Federal + Regional) – Mandatory Social Deductions – Post-Tax Deductions
Comprehensive gross-to-net salary and hourly take-home pay calculator reflecting federal, state, and statutory tax withholdings and deductions.
Payroll Calculator
Total Employer Cost = Gross Wages + Employer Social Match + Federal/State Unemployment Taxes + Employer Benefits
Employer payroll burden calculator computing employer payroll taxes, FICA match, unemployment insurance, and total cost of workforce employment.
PDF to Word
Spatial clustering Δy ≤ ε_line and glyph gap evaluation reconstruct paragraph and table layout trees
Document conversion pipeline converting PDF layout containers, text streams, and tables into editable DOCX format with high typographic fidelity.
Percentage Calculator
P% of X = (P ÷ 100) × X A as a percent of B = (A ÷ B) × 100 Percentage change = (New − Old) ÷ |Old| × 100 X increased by P% = X × (1 + P ÷ 100)
Four percentage calculators in one: percent of a number, what percent A is of B, percentage change, and increasing or decreasing a number by a percentage.
QLD Car Stamp Duty Calculator
Duty = (value ÷ $100, rounded up) × rate Up to $100,000: hybrid/electric $2 · 1–4 cyl $3 · 5–6 cyl $3.50 · 7+ cyl $4 Over $100,000 (whole value): $4 · $5 · $5.50 · $6
Work out Queensland vehicle registration duty (car stamp duty) for a new or used car, by engine type.
QR Code Generator
Bitstream packing + Reed-Solomon Galois Field GF(2^8) error correction polynomial division
Privacy-first vector QR code generator creating scannable codes for URLs, WiFi credentials, vCards, and plain text with SVG and PNG export.
SA Car Stamp Duty Calculator
Non-commercial vehicles: Up to $1,000: $1 per $100 (minimum $5) $1,000–$2,000: $10 + $2 per $100 over $1,000 $2,000–$3,000: $30 + $3 per $100 over $2,000 Over $3,000: $60 + $4 per $100 over $3,000
Work out South Australian stamp duty on a new or used car (non-commercial vehicle) with the RevenueSA rates.
Salary Sacrifice Calculator
Cost to take-home pay = take-home without sacrifice − take-home with sacrifice Saving on the sacrificed amount = income tax at your marginal rate + employee NI (8% or 2%) + student loan (9%) if you repay one Cost per £1 = cost to take-home ÷ amount sacrificed
Compare your take-home pay with and without a pension salary sacrifice and see what each £1 into your pension really costs you.
Scotland LBTT Calculator
LBTT: 0% to £145,000 · 2% to £250,000 · 5% to £325,000 · 10% to £750,000 · 12% above First-time buyers: nil-rate band raised to £175,000 (saves up to £600) Additional Dwelling Supplement: 8% of the whole price (£40,000 or more)
Work out Land and Buildings Transaction Tax on a Scottish property, with first-time buyer relief and the 8% Additional Dwelling Supplement.
Scotland Take-Home Pay Calculator
Scottish income tax on income above £12,570: 19% to £16,537 · 20% to £29,526 · 21% to £43,662 · 42% to £75,000 · 45% to £125,140 · 48% above National Insurance = 8% of earnings £12,570–£50,270 + 2% above (same as the rest of the UK)
Your salary after Scottish income tax, National Insurance, pension and student loan for 2026/27, using all six Scottish tax bands.
Second Home Stamp Duty Calculator
England & NI: standard SDLT bands + 5% on every band (so 5% · 7% · 10% · 15% · 17%) Scotland: LBTT + Additional Dwelling Supplement of 8% of the whole price Wales: LTT higher rates 5% to £180,000 · 8.5% to £250,000 · 10% to £400,000 · 12.5% to £750,000 · 15% to £1.5m · 17% above No surcharge on purchases under £40,000
Calculate stamp duty on a second home, holiday home or buy-to-let in England, Northern Ireland, Scotland or Wales, including the surcharge and when you can reclaim it.
Split PDF
Split a PDF into one file per page, or extract custom page ranges such as 1-3, 5 and 8-10. Processing happens on your device.
Tasmania Car Stamp Duty Calculator
Up to $600: $20 $600–$35,000: $3 per $100 or part of the value $35,000–$40,000: $1,050 + $11 per $100 or part over $35,000 Over $40,000: $4 per $100 or part of the whole value
Work out Tasmanian motor vehicle duty (car stamp duty) on a new or used passenger vehicle.
Temperature Converter
°F = °C × 9/5 + 32 °C = (°F − 32) × 5/9 K = °C + 273.15
Convert between Celsius, Fahrenheit and Kelvin instantly, with the formulas and common reference temperatures.
UK Stamp Duty Calculator
England & NI (SDLT): 0% to £125,000 · 2% to £250,000 · 5% to £925,000 · 10% to £1.5m · 12% above First-time buyers (price up to £500,000): 0% to £300,000 · 5% to £500,000 Second homes: +5% on every band · Non-UK residents: +2% on every band
Work out the stamp duty on a house purchase in England, Northern Ireland, Scotland or Wales, including first-time buyer relief, second homes and the non-resident surcharge.
UK Take-Home Pay Calculator
Income tax = 20% of taxable income up to £37,700, 40% up to £125,140, 45% above Taxable income = salary − pension (net pay) − personal allowance (£12,570) National Insurance = 8% of earnings £12,570–£50,270 + 2% above Student loan = 9% of earnings over your plan threshold
See your salary after income tax, National Insurance, pension and student loan for the 2026/27 tax year — per year, month or week.
UK VAT Calculator
Add VAT: gross = net × (1 + rate ÷ 100) → at 20%: net × 1.2 Remove VAT: net = gross ÷ (1 + rate ÷ 100) → at 20%: gross ÷ 1.2 VAT inside a 20% price = gross × 1/6 · inside a 5% price = gross × 1/21
Add VAT to a price or work out how much VAT is included in a total, at the UK standard (20%), reduced (5%), zero or a custom rate.
UUID Generator
UUID layout: xxxxxxxx-xxxx-Vxxx-Nxxx-xxxxxxxxxxxx V = version (4 or 7), N = variant (8, 9, a or b) v7: first 48 bits = Unix time in milliseconds
Generate random UUID v4 or time-ordered UUID v7 identifiers, one at a time or up to 1,000 in bulk.
Victoria Car Stamp Duty Calculator
Duty = (value ÷ $200, rounded up) × rate for the value band Up to $80,809: $8.40 · $80,809–$100,000: $10.40 · $100,000–$150,000: $14.00 · over $150,000: $18.00 Green cars (CO₂ ≤ 120 g/km) and primary producers: $8.40 at any value
Estimate the motor vehicle duty on a car registered in Victoria for 2026–27, including luxury and green car rates.
WA Car Stamp Duty Calculator
Up to $25,000: 2.75% of the value $25,000–$50,000: R% of the value, R = 2.75 + (value − 25,000) ÷ 6,666.66 (rounded to 2 decimals) Over $50,000: 6.5% of the value
Work out Western Australian vehicle licence duty (car stamp duty) on a new or used light passenger vehicle.
Weight Converter
1 pound (lb) = 0.45359237 kg (exact) 1 ounce = 1/16 lb = 28.349523125 g 1 stone = 14 lb = 6.35029318 kg 1 US ton = 2,000 lb · 1 UK ton = 2,240 lb
Convert between kilograms, grams, pounds, ounces, stone and tons using the exact international definitions.
Word Counter
Reading time = words ÷ 238 words per minute Speaking time = words ÷ 150 words per minute
Count words, characters, sentences and paragraphs as you type, with reading time, speaking time and common platform limits.