Calculators · Group 06 of 08
Nine precision instruments for every scale and system — all running live in the box above. Pick a converter, type your value and watch every result update instantly, right in your tab. Nothing is uploaded, nothing is stored.
One universal panel for every category on this page — length, weight, area, volume, speed, temperature and pressure. Choose a category, pick the two units, and alongside the result you get the conversion factor, its reciprocal and the value expressed in the base unit.
Length · 100 cm → inches…
39.3701 in · 1 in = exactly 2.54 cm.
Use it for quick anything-to-anythinghomeworkshopping abroaddata entry
From millimetres to miles — and nautical miles for the sailors and pilots. Nine units anchored on the metre, using the exact international definitions (1 inch = 2.54 cm, 1 yard = 0.9144 m), so the factors never drift.
5 km → miles…
3.1069 mi · also 1,640.42 ft · 19,685 in.
Use it for travel distancesconstructionfabric & tailoringheights & sizes
Mass across both systems: milligrams, grams, kilograms and tonnes on one side; ounces, pounds, stones and US tons on the other. The pound is pinned to its exact legal value of 0.45359237 kg.
70 kg → pounds…
154.324 lb · 11 st 0.3 lb · 2,469 oz.
Use it for body weightluggage limitsrecipesshipping costs
Ten area units from square millimetres to square miles, including the two that real estate actually speaks: hectares and acres. One click tells you what a listing's "1,200 sq ft" is in square metres.
1 acre → square metres…
4,046.86 m² · 0.4047 ha · 43,560 ft².
Use it for property listingsland & farmingfloor planspaint & tiling
From laboratory millilitres to kitchen measures: litres, cubic metres, and the full US customary stack — teaspoon, tablespoon, fluid ounce, cup, pint, quart and gallon. Note these are US units; the imperial gallon is about 20% larger and not included.
1 US gallon → litres…
3.7854 l · 16 cups · 128 fl oz.
Use it for recipesfuel & tankslab workbeverage sizes
Five ways to say how fast: m/s, km/h, mph, ft/s and knots. The factors are exact — 1 km/h = 1/3.6 m/s, 1 knot = 1,852 m/h — so physics homework, road trips and sailing logs all agree.
100 km/h → mph…
62.14 mph · 27.78 m/s · 53.99 kn.
Use it for speed limits abroadcycling & runningwind reportsphysics class
Celsius, Fahrenheit, Kelvin and Rankine — converted correctly through offsets, not just multiplication. The tool pivots through Celsius: F → °C subtracts 32 and scales by 5/9; K → °C subtracts 273.15; then out to the target scale.
25 °C → everywhere…
77 °F · 298.15 K · 536.67 °R — pleasant either way you measure it.
Use it for weather abroadoven temperaturesscience labsengineering specs
Pascals, kilopascals, bar, psi, atmospheres and mmHg (torr) — the six units that show up on tire sidewalls, weather maps, dive computers and blood-pressure monitors. 1 atm is pinned to its definition: exactly 101,325 Pa.
1 atm → psi…
14.696 psi · 101.325 kPa · 760 mmHg.
Use it for tire pressureHVAC & gasdivingweather data
Built for runners: enter a distance and a time, and it returns pace per kilometre and per mile, speed in km/h and mph, plus projected finish times for 5K, 10K and the marathon at the same effort.
5 km in 25:00…
5:00 /km · 8:03 /mi · 12 km/h → marathon ≈ 3:30:59.
Use it for race goalstraining zonestreadmill settingssplits analysis
Conventions · metric + US customary · 1 in = 2.54 cm and 1 lb = 0.45359237 kg, exact · volume uses US measures · temperature pivots through °C · pace assumes constant speed · results shown to 6 significant decimals
This page has no backend and no database. Every conversion you just watched was computed by JavaScript inside your own browser tab — your values never traveled a single centimeter of cable. Close the page and they're gone for good.
Metric and US customary. Volume uses US gallons, cups, tablespoons and teaspoons — the UK imperial gallon is about 20% larger and is not included. All factors use the modern exact definitions: 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 atmosphere = 101,325 Pa.
Because the zero points differ. The converter pivots through Celsius: it first converts the input to °C (from °F: subtract 32, multiply by 5/9; from K: subtract 273.15) and then converts from °C to the target scale. A difference of 1 °C always equals 1.8 °F or 1 K.
Enter a distance (km, miles or metres) and the time it took. It returns pace per kilometre and per mile, speed in km/h and mph, and projected 5K, 10K and marathon finish times, assuming the same pace is held for the whole race.
No. IrisTool has no backend and no database. All conversions run inside your browser tab and disappear the moment you close or refresh the page. Your values are never transmitted, stored or logged.