Free Online Calculators in 5 Languages
Convert time, military time, Roman numerals, temperature, age, height, and weight in under one second. Free, no ads, no signup.
10
Converters
5
Languages
30k+
Pages
Free
Always
All Converters
Time Converter
Convert between 12-hour and 24-hour time formats instantly.
18:00→6:00 PM
Open converter →Roman Numerals
Convert any number to Roman numerals or decode Roman numerals.
2026→MMXXVI
Open converter →Age Calculator
Calculate your exact age, generation, zodiac, and more.
Born 1990→35–36 yrs
Open converter →Weight Converter
Convert weight between kilograms, pounds, and stones.
70 kg→154.32 lbs
Open converter →Inches to CM
Convert inches to centimeters, feet, meters, and millimeters.
12 in→30.48 cm
Open converter →Minutes Converter
Convert minutes to hours, seconds, days, and percentage of a day.
90 min→1h 30m
Open converter →Fraction Converter
Convert common fractions to decimals and percentages instantly.
3/4→0.75
Open converter →Popular Conversions
Time Conversions
Military Time
Roman Numerals
Temperature
Age Calculator
Available in 5 Languages
Every converter is fully translated and SEO-optimised in each language.
Frequently Asked Questions
- What is CalcFlip?
- CalcFlip is a free online unit converter covering seven tools: time (12/24-hour), military time, Roman numerals, Celsius temperature, age, height, and weight. All converters require no signup and return results instantly.
- What languages does CalcFlip support?
- CalcFlip is available in 5 languages: English, Spanish (/es), German (/de), Dutch (/nl), and Portuguese (/pt). Every converter page is fully translated and SEO-optimised in each language.
- Is CalcFlip free to use?
- Yes, CalcFlip is completely free. There is no subscription, no login, and no account required. All seven converters are available at no cost, forever.
- How accurate are CalcFlip's conversions?
- CalcFlip's conversions are mathematically precise. Temperature uses the exact formulas (°F = °C × 9/5 + 32; K = °C + 273.15). Weight uses 2.20462 lbs per kg exactly. Height uses 2.54 cm per inch. Time and Roman numeral conversions are exact by definition.
- Does CalcFlip work on mobile?
- Yes, CalcFlip is fully responsive and works on all devices. Pages are statically generated so they load instantly even on slow mobile connections. No JavaScript is required to display results.