On-device
Percentage Calculator
Solve percentage-of, percentage-change and reverse-percentage questions.
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Everyday Tools
Solve common date, percentage, unit, travel, household and sharing questions with clear inputs and reusable results.
The everyday floor replaces throwaway searches and oversized spreadsheets with small, explainable utilities. The rooms are broad enough for real life but narrow enough that their output can be checked without trusting a black box.
On-device
Unit Converter
Convert common length, mass, temperature, area, volume and speed units.
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Date Difference Calculator
Find elapsed calendar days, weekdays or an exact year-month-day interval.
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Age Calculator
Calculate calendar age on a chosen reference date and the next anniversary.
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Secure Password Generator
Generate passwords locally with cryptographic randomness and clear entropy inputs.
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Tip & Bill Split Calculator
Calculate a tip and divide a bill across people with optional rounding.
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Cost per Mile Calculator
Estimate vehicle cost per mile from costs and distance that you enter.
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Fuel Trip Cost Calculator
Estimate trip fuel quantity and cost from distance, economy and your fuel price.
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Commute Cost Calculator
Estimate recurring commute distance and entered driving or transit costs.
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Transit Pass Break-Even Calculator
Compare a user-entered transit pass price with pay-as-you-go journeys.
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Fair Rent Split Calculator
Explore equal, income-weighted or custom room-weighted rent shares.
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Subscription Cost Calculator
Normalise user-entered subscriptions to monthly, annual and per-use costs.
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Time Zone Overlap Finder
Find shared working-hour windows across up to six named time zones.
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External API
Currency Converter
Convert between 30 currencies using dated ECB reference rates.
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External API
Exchange Rate Table
See one currency against all 30 covered currencies in a single dated table.
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On-device
BMI Calculator
Calculate BMI in metric or imperial with the honest caveats attached.
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Average Calculator
Mean, median, mode and range from any pasted list of numbers.
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Standard Deviation Calculator
Standard deviation and variance, sample and population both shown.
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Fraction Calculator
Add, subtract, multiply and divide fractions with reduced answers.
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Ratio Calculator
Simplify ratios, scale them, and convert to 1:n and percentages.
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Exponent & Root Calculator
Powers and nth roots with the check computation printed.
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Quadratic Equation Solver
Solve ax²+bx+c=0 with discriminant, roots and vertex shown.
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GPA Calculator
Credit-weighted GPA on whatever grading scale your institution uses.
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Final Grade Calculator
“What do I need on the final?” — answered with the working.
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Calorie & BMR Calculator
BMR and daily calories (TDEE) by Mifflin-St Jeor, every activity level shown.
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Body Fat Calculator
US Navy tape-measure method with honest error bars and bands.
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Ideal Weight Calculator
Four published formulas side by side — because the spread IS the answer.
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Due Date Calculator
Estimated due date from LMP or conception, trimesters included.
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Sleep Cycle Calculator
Bedtimes and wake times aligned to 90-minute sleep cycles.
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Date Add & Subtract
Add or subtract days, weeks, months or years from any date.
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Time Duration Calculator
Hours and minutes between two times, midnight-safe, break-aware.
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Timesheet Calculator
A week of shifts to total hours, decimal time and optional pay.
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Discount Calculator
Sale price, savings, and the truth about stacked discounts.
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On-device
Betting Odds Converter
Decimal, fractional, American and implied probability — all four, any input.
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On-device
Cm to Inches Converter
Convert between centimetres and inches instantly, both directions, with a quick table.
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Kg to Lbs Converter
Convert between kilograms and pounds instantly, both directions, with a quick table.
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Celsius to Fahrenheit
Convert between Celsius and Fahrenheit instantly, both directions, with a quick table.
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Miles to Km Converter
Convert between miles and kilometres instantly, both directions, with a quick table.
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Metres to Feet Converter
Convert between metres and feet instantly, both directions, with a quick table.
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Mm to Inches Converter
Convert between millimetres and inches instantly, both directions, with a quick table.
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Grams to Ounces Converter
Convert between grams and ounces instantly, both directions, with a quick table.
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Litres to Gallons Converter
Convert between litres and US gallons instantly, both directions, with a quick table.
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Roman Numeral Converter
Numbers to Roman numerals and back, 1–3999, canon checked.
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Running Pace Converter
Pace ↔ speed with race-time projections for 5K to marathon.
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Military Time Converter
12-hour ↔ 24-hour time, the noon/midnight traps defused.
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Time Zone Converter
One moment converted between any two IANA zones, DST-exact.
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Cups to Grams Converter
Cups ↔ grams per ingredient — because volume is not weight.
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Shoe Size Converter
UK, US and EU sizes converted, with foot-length truth included.
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Stone to Kg Converter
Convert between stone and kilograms instantly, both directions, with a quick table.
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Km/h to Mph Converter
Convert between km/h and mph instantly, both directions, with a quick table.
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Ml to Fl Oz Converter
Convert between millilitres and US fluid ounces instantly, both directions, with a quick table.
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Acres to Hectares
Convert between acres and hectares instantly, both directions, with a quick table.
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Square Feet to Square Metres
Convert between square feet and square metres instantly, both directions, with a quick table.
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Yards to Metres Converter
Convert between yards and metres instantly, both directions, with a quick table.
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Knots to Mph Converter
Convert between knots and mph instantly, both directions, with a quick table.
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PSI to Bar Converter
Convert between PSI and bar instantly, both directions, with a quick table.
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HP to kW Converter
Convert between horsepower and kilowatts instantly, both directions, with a quick table.
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Calories to Kilojoules
Convert between kilocalories and kilojoules instantly, both directions, with a quick table.
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Nm to Ft-lb Converter
Convert between newton-metres and foot-pounds instantly, both directions, with a quick table.
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Cm to Feet & Inches
Convert between centimetres and feet instantly, both directions, with a quick table.
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Litres to Quarts
Convert between litres and US quarts instantly, both directions, with a quick table.
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Mcg to Mg Converter
Convert between micrograms and milligrams instantly, both directions, with a quick table.
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Teaspoons to Ml Converter
Convert between teaspoons and millilitres instantly, both directions, with a quick table.
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Leap Year Checker
Is it a leap year? Verdict, rule, and the next five.
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Week Number Finder
The ISO week number for today or any date, standard explained.
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Day of the Week Finder
What day was that date — and the next five anniversaries.
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Star Sign Finder
Birth date to zodiac sign, symbol included, cusps acknowledged.
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Moon Phase Calculator
Today’s (or any date’s) moon phase, illumination and next full moon.
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Anniversary Names Finder
Which anniversary is year N? Paper to diamond, gift logic included.
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Chinese Zodiac Finder
Year to animal AND element — with the Lunar New Year caveat up front.
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Birthstone Finder
Month to birthstone with colour, meaning and the full-year table.
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Dog Age Calculator
Dog years by the 2019 epigenetic formula — the ×7 myth retired.
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Cat Age Calculator
Cat years by the veterinary convention — 15, 24, then +4 a year.
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Tea Brewing Guide
Water temperature, steep time and caffeine for eleven tea styles.
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Caffeine Calculator
Total your day’s caffeine across tea, coffee, cola and energy drinks.
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Passphrase Generator
Diceware-style word passphrases with the entropy maths shown.
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On-device
Tea Round Calculator
The office round audited: money, minutes and milligrams per year.
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A useful collection, not a link farm
How URSY.io approaches everyday tools
Calculations state their units and assumptions, use local device time only where the task requires it and avoid presenting estimates as professional financial, medical or legal guidance. No account history is required to run a scenario.
Read our complete methodology