Transparent methods
Every tool explains its calculation basis, display rounding, assumptions and important limitations.
● Free tools without the frictionUseful tools.
Useful tools.
Instant results.
Clear, practical calculators and browser-based utilities for everyday work and life. No account, no unnecessary steps and no hidden formulas.
✓ Free to use✓ Privacy-conscious✓ Mobile friendly
One independently reviewed utility platform
Built to make common tasks understandable
Utilaroo combines working tools with original explanations, worked examples, visible assumptions and primary reference points—so you can calculate an answer and judge whether it fits the task.
Private where practical
Calculations and supported file processing run in your browser whenever the tool allows it.
Examples you can check
Worked examples and current primary sources help you reproduce the reasoning instead of trusting a black box.
Twenty-one tools now available
A reviewed library of practical tools
Each utility is paired with task-specific guidance, an inspectable method and a clear boundary around what the result cannot decide.
Percentage, Margin & Markup Calculator
Handle everyday percentage and commercial calculations.
Open tool →Global Meeting Time-Zone Planner
Find fair working-hour overlaps across 166 cities.
Open tool →Date, Duration & Business-Day Calculator
Plan date ranges, deadlines and working days.
Open tool →Fuel Cost, Road-Trip & EV Charging Calculator
Estimate fuel, charging, extra and per-person trip costs.
Open tool →Private Image Compressor & Resizer
Resize and convert images without uploading them.
Open tool →Salary, Hourly Rate & Pay-Rise Calculator
Convert pay periods and model raises, bonuses and unpaid time.
Open tool →Text Analyser, Word Counter & Readability Checker
Review length, timing, clarity and repeated keywords privately.
Open tool →Recipe Scaler & Cooking Measurement Converter
Scale servings, convert regional cooking units and compare pan sizes.
Open tool →Home Material Estimator
Plan paint, flooring, tiles, wallpaper, concrete and decking quantities.
Open tool →QR Code Generator & Scanner
Create, download and scan QR codes privately in your browser.
Open tool →Aspect-Ratio & Social Crop Studio
Create coordinated crops for social, marketplace and advertising placements.
Open tool →Business Loan Repayment, Comparison & DSCR Calculator
Estimate loan repayments, fees, amortisation and debt-service coverage.
Open tool →Home Affordability & Mortgage Capacity Calculator
Model a budget-based home price and test higher interest rates.
Open tool →Age, Anniversary & Milestone Calculator
Calculate exact ages, next anniversaries and meaningful calendar milestones.
Open tool →Appliance Electricity Running-Cost Calculator
Estimate appliance energy use, running costs and potential savings.
Open tool →Solar Panel & Home Battery Savings and Payback Calculator
Estimate solar generation, battery value, grid imports and simple payback.
Open tool →Heating & Cooling System Cost Comparison & Payback Calculator
Compare seasonal operating costs, efficiency ranges and incremental payback.
Open tool →Contract vs Permanent Pay Calculator Australia
Compare a permanent salary package with a contractor day-rate scenario.
Open tool →Contractor Day Rate Calculator Australia
Work backwards from an annual target to a transparent contractor day-rate scenario.
Open tool →Leave & Contract Gap Calculator Australia
Separate unbilled downtime revenue from an expense-based reserve scenario.
Open tool →