On this page, you can convert between pace in minutes per km and speed in kilometers per hour and vice-versa. Use our running calculator, to calculate your running pace, running speed and for race time prediction. minute par mille. Yet when I go for a run my pace shows as miles/min vs KMs/min. How many minutes per kilometer in kilometers per hour? ORIGINAL FULLY BAKED SOFT PRETZELS, ORIGINAL, UPC: 073321000189 contain(s) 250 calories per 100 grams or ≈3.527 ounces [ price ], Foods high in 25-hydroxycholecalciferol and foods low in 25-hydroxycholecalciferol, CaribSea, Marine, CORALine, Caribbean Crushed Coral weighs 1 153.33 kg/m³ (72.00004 lb/ft³) with specific gravity of 1.15333 relative to pure water. Miles per minute is a unit of Speed or Velocity in both US Customary Units as well as the Imperial System. Convertir a minutos por millas en minutos por kilómetros. Use this page to learn how to convert between miles and kilometres. Hours . How many mile/minute in 1 km/hr? If you need to convert minutes per mile to another compatible unit, please pick the one you need on the page below. Use this page to learn how to convert between miles/hour and kilometers/minute. minute par kilomètre. You can also go to the universal conversion page. Conversion Table. Compute the volume of a cube and its surface area, The Conversions and Calculations web site, conversion tables of units of measurements, conversion table of minutes per mile to minutes per kilometer, 1 min/mi to min/km = 0.621371192 min/km, 2 min/mi to min/km = 1.242742384 min/km, 3 min/mi to min/km = 1.864113577 min/km, 4 min/mi to min/km = 2.485484769 min/km, 5 min/mi to min/km = 3.106855961 min/km, 6 min/mi to min/km = 3.728227153 min/km, 7 min/mi to min/km = 4.349598346 min/km, 8 min/mi to min/km = 4.970969538 min/km, 10 min/mi to min/km = 6.213711922 min/km, 11 min/mi to min/km = 6.835083115 min/km, 12 min/mi to min/km = 7.456454307 min/km, 13 min/mi to min/km = 8.077825499 min/km, 14 min/mi to min/km = 8.699196691 min/km, 15 min/mi to min/km = 9.320567884 min/km, 16 min/mi to min/km = 9.941939076 min/km, 17 min/mi to min/km = 10.563310268 min/km, 18 min/mi to min/km = 11.18468146 min/km, 19 min/mi to min/km = 11.806052653 min/km, 20 min/mi to min/km = 12.427423845 min/km, 21 min/mi to min/km = 13.048795037 min/km, 22 min/mi to min/km = 13.670166229 min/km, 23 min/mi to min/km = 14.291537421 min/km, 24 min/mi to min/km = 14.912908614 min/km, 25 min/mi to min/km = 15.534279806 min/km, 26 min/mi to min/km = 16.155650998 min/km, 27 min/mi to min/km = 16.77702219 min/km, 28 min/mi to min/km = 17.398393383 min/km, 29 min/mi to min/km = 18.019764575 min/km, 30 min/mi to min/km = 18.641135767 min/km, 31 min/mi to min/km = 19.262506959 min/km, 32 min/mi to min/km = 19.883878152 min/km, 33 min/mi to min/km = 20.505249344 min/km, 34 min/mi to min/km = 21.126620536 min/km, 35 min/mi to min/km = 21.747991728 min/km, 36 min/mi to min/km = 22.369362921 min/km, 37 min/mi to min/km = 22.990734113 min/km, 38 min/mi to min/km = 23.612105305 min/km, 39 min/mi to min/km = 24.233476497 min/km, 40 min/mi to min/km = 24.854847689 min/km, 41 min/mi to min/km = 25.476218882 min/km, 42 min/mi to min/km = 26.097590074 min/km, 43 min/mi to min/km = 26.718961266 min/km, 44 min/mi to min/km = 27.340332458 min/km, 45 min/mi to min/km = 27.961703651 min/km, 46 min/mi to min/km = 28.583074843 min/km, 47 min/mi to min/km = 29.204446035 min/km, 48 min/mi to min/km = 29.825817227 min/km, 49 min/mi to min/km = 30.44718842 min/km, 50 min/mi to min/km = 31.068559612 min/km, 51 min/mi to min/km = 31.689930804 min/km, 52 min/mi to min/km = 32.311301996 min/km, 53 min/mi to min/km = 32.932673189 min/km, 54 min/mi to min/km = 33.554044381 min/km, 55 min/mi to min/km = 34.175415573 min/km, 56 min/mi to min/km = 34.796786765 min/km, 57 min/mi to min/km = 35.418157958 min/km, 58 min/mi to min/km = 36.03952915 min/km, 59 min/mi to min/km = 36.660900342 min/km, 60 min/mi to min/km = 37.282271534 min/km, 61 min/mi to min/km = 37.903642726 min/km, 62 min/mi to min/km = 38.525013919 min/km, 63 min/mi to min/km = 39.146385111 min/km, 64 min/mi to min/km = 39.767756303 min/km, 65 min/mi to min/km = 40.389127495 min/km, 66 min/mi to min/km = 41.010498688 min/km, 67 min/mi to min/km = 41.63186988 min/km, 68 min/mi to min/km = 42.253241072 min/km, 69 min/mi to min/km = 42.874612264 min/km, 70 min/mi to min/km = 43.495983457 min/km, 71 min/mi to min/km = 44.117354649 min/km, 72 min/mi to min/km = 44.738725841 min/km, 73 min/mi to min/km = 45.360097033 min/km, 74 min/mi to min/km = 45.981468226 min/km, 75 min/mi to min/km = 46.602839418 min/km, 76 min/mi to min/km = 47.22421061 min/km, 77 min/mi to min/km = 47.845581802 min/km, 78 min/mi to min/km = 48.466952994 min/km, 79 min/mi to min/km = 49.088324187 min/km, 80 min/mi to min/km = 49.709695379 min/km, 81 min/mi to min/km = 50.331066571 min/km, 82 min/mi to min/km = 50.952437763 min/km, 83 min/mi to min/km = 51.573808956 min/km, 84 min/mi to min/km = 52.195180148 min/km, 85 min/mi to min/km = 52.81655134 min/km, 86 min/mi to min/km = 53.437922532 min/km, 87 min/mi to min/km = 54.059293725 min/km, 88 min/mi to min/km = 54.680664917 min/km, 89 min/mi to min/km = 55.302036109 min/km, 90 min/mi to min/km = 55.923407301 min/km, 91 min/mi to min/km = 56.544778494 min/km, 92 min/mi to min/km = 57.166149686 min/km, 93 min/mi to min/km = 57.787520878 min/km, 94 min/mi to min/km = 58.40889207 min/km, 95 min/mi to min/km = 59.030263263 min/km, 96 min/mi to min/km = 59.651634455 min/km, 97 min/mi to min/km = 60.273005647 min/km, 98 min/mi to min/km = 60.894376839 min/km, 99 min/mi to min/km = 61.515748031 min/km, 100 min/mi to min/km = 62.137119224 min/km. Conversion min/km en km/h (Allure > Vitesse) HH MM SS Temps/km = km/h . This page features online conversion from minutes per mile to kilometer per hour.These units belong to different measurement systems. Task: Convert 75 miles per minute to kilometers per minute (show work) Formula: mi/m x 1.609344 = km/m Calculations: 75 mi/m x 1.609344 = 120.7008 km/m Result: 75 mi/m is equal to 120.7008 km/m. Conversion Formula. mph, kph? This calculator convert pace and speed in the unit of mile, and km. You can also go to the universal conversion page. There are 1.609344 km/m in mi/m. Seconds . Running pace chart was created in excel using formulas. Convertir rapidez unidades, convertir minutos por kilómetro en minutos por milla, convertir min/km en min/mile . km/h minute par mille . The kilometer/second [km/s] to kilometer/hour [km/h] conversion table and conversion steps are also listed. Miles per minute . An easy to use calculator to convert between paces determined in min/km and min/mile. Changez d'unités Unité source. Minutes per mile. 2: Enter the value you want to convert (minutes per mile). McBerz over 2 years ago. Mile per hour. Usually, training schedules show running speed as minutes per mile, or mins per km. How many minutes per mile in a mile per hour: If v mi/h = 1 then v min/mi = 60 min/mi. 1 meter/second is equal to 2.2369362920544 mile/hour, or 0.06 km/min. Usually, training schedules show running speed as minutes per mile, or mins per km. 2 km. Outil gratuit en ligne pour faire vos calculs d'unités. 1min/km = 1.609344min/mile. the outside world of pace (minutes per mile). Miles par minute en Kilomètres par minute (miles/min en km/min) calculatrice de conversion pour les conversions de Vitesse avec tables et formules supplémentaires. ... Minutes per mile. Multiplications by real numbers can be harder, to simplify you can replace the distance constant with 161 / 100. e.g. Marathon * If you maintain the speed, you will run the above distances at the equivalent time. Minutes per km. 1.609344min/mile. We've created a run pace converter chart below that converts all these units and also shows how they relate to common race distances and lap times. Miles per minute; 40 km/min: 24.85 miles/min: 41 km/min: 25.48 miles/min: 42 km/min: 26.10 miles/min: 43 km/min: 26.72 miles/min: 44 km/min: 27.34 miles/min: 45 km/min: 27.96 miles/min: 46 km/min: 28.58 miles/min: 47 km/min: 29.20 miles/min: 48 km/min: 29.83 miles/min: 49 km/min: 30.45 miles/min: 50 km/min: 31.07 miles/min: 51 km/min: 31.69 miles/min: 52 km/min: 32.31 miles/min: 53 km/min: 32.93 … 2: Enter the value you want to convert (kilometer per minute). km/s↔kt 1 km/s = 1943.844492 kt » Mile/minute Conversions: mi/min↔mps 1 mi/min = 26.822409 mps mi/min↔m/ms 1 m/ms = 37.282259 mi/min mi/min↔cm/min 1 mi/min = 160934.454106 cm/min mi/min↔km/s 1 km/s = 37.282259 mi/min mi/min↔km/min 1 mi/min = 1.609345 km/min mi/min↔kph 1 mi/min = 96.560672 kph mi/min↔km/d 1 mi/min = 2317.456139 km/d Then click the Convert Me button. km/t. Running speed and running pace converter. Minutes per 400 m. Minutes per 1500 m. Minutes per 800 yards . min/km. Divisions by real numbers can be challenging, but luckily you can use a trick described by this mathematical formula. What is miles per minute (mi/m)? This is a conversion chart for minutes per mile (Pace (Various Sports)). Minutes per km. Calculez les minutes par kilomètre en minutes par mille, convertir min/km vers min/mile . Minute per mile is an imperial or United States customary unit of speed. Mile/minute to Kilometer/hour Kilometer/hour to Mile/minute ; 0.01 Mile/minute [mi/min] = 0.96560639999999 Kilometer/hour [km/h] 0.01 Kilometer/hour [km/h] = 0.00010356186537289 Mile/minute [mi/min] If you need to convert minutes per mile to another compatible unit, please pick the one you need on the page below. The answer is 0.010356186537289. 2: Enter the value you want to convert (minutes per mile). 19 juil. This page features online conversion from minutes per mile to kilometer per hour.These units belong to different measurement systems. One kilometer per minute converted into mile per hour equals = 37.28 mph Running at 5-minute mile pace, for me at least, is a shock to the system. It measures the number of miles traveled in a minute. Once you know what 1 min/mi is in minutes per kilometre, you can simply multiply by the total minutes per mile you want to calculate. Convertissez les unités de vitesse. e.g. However, I see two possible ways out. Le kilomètre par heure ou km/heure, ou encore kilomètre à l'heure est un multiple direct du mètre par seconde. Then click the Convert Me button. Distance* Time. How to convert kilometers per hour to minutes per mile [km/h to min/mi]: minute per mile = 96.56064 ÷ (kilometer per hour) How many minutes per mile in a kilometer per hour: If v km/h = 1 then v min/mi = 96.56064 min/mi. How to convert minutes per kilometer to minutes per mile [min/km to min/mi]: v min/mi = … Taken straight up, there is no answer to this, because a minute is a unit of time, and a mile is a unit of distance. Relation de base : 1 min/km = 1.609344 min/mile. Road speed limits are given in kilometers per hour which is abbreviated as kph or km/h. The symbol for miles per minute is mi/m. What is miles per minute (mi/m)? This is a measurement of speed typically used in countries using the metric system for transport. The distance d in kilometers (km) is equal to the distance d in miles (mi) times 1.609344: d (km) = d (mi) × 1.609344 . There are 0.6213711922 mi/m in km/m. Pour une réponse plus précise, veuillez sélectionner « décimal » dans les options au-dessus du résultat. Pace is min/mile not min/km. Unités métriques. Pace Converter: min/km ↔ min/mile. Vous êtes en train de convertir des unités de vitesse de minute par kilomètre en minute par mille. Example. 1 min/mi to min/km = 0.621371192 min/km. Remarque : Pour obtenir un résultat décimal exact, veuillez sélectionner « décimal » dans les options au-dessus du résultat. Then click the Convert Me button. If you need to convert minutes per mile to another compatible unit, please pick the one you need on the page below. Unit Pace/Speed. Convert Running Pace (e.g. Table de Milles en Kilomètres. 2. table de milles par heure en kilomètres par minute. (1) If there is an understood speed involved, you can use it to convert between time and distance. On this page, you can convert between pace in minutes per mile and speed in miles per hour and vice-versa. Minutes per 400 m. Minutes per 1500 m. Minutes per 800 yards . C'est la vitesse nécessaire pour parcourir un kilomètre en une heure. km/t. 1km équivaut à 0,6214 miles. Le kilomètre est une unité de longueur du système métrique égale à mille mètres. Type in your own numbers in the form to convert the units! mph, kph? Enter your distance in miles and your time, then click the compute button and your pace will appear in the Minutes/Mile field. 1 min/km = 16.666666666667 m/s: meter ⁄ second = 16.666666667 ÷ (minute ⁄ kilometer) minute ⁄ kilometer mile ⁄ hour: 1 min/km = 37.282271534 mi/h: mile ⁄ hour = 37.282271534 ÷ (minute ⁄ kilometer) minute ⁄ kilometer mile ⁄ minute: 1 min/km = 0.621371192237 mi/min 20 km. I made this for myself because I became very accustomed to using mph from my treadmill as a gauge of my speed, and thus pace. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. If your pace is 9.5 minutes per mile and you ran 3 miles: 9.5 min per mi × 3 mi = 28.5 minutes = 28 minutes, 30 seconds How to calculate running speed. X / (A / B) = X * (B / A) Therefore instead of dividing by 1.61 that equals to (161 / 100), multiply by (100 / 161). What is miles per minute (mi/m)? Convert pace to speed, and speed to pace both mile and km. km = mi _____ 0.62137. Cube calculator. Divide your run distance by your run time; If you ran 2.5 miles and you ran for 20 minutes: 2.5 mi ÷ 20 min = 0.125 miles per minute For quick reference purposes, below is a conversion table that you can use to convert from mi/m to km/m. The minutes per mile to minutes per kilometer calculator exactly as you see it above is 100% free for you to use. Instant free online tool for kilometer/second to kilometer/hour conversion or vice versa. To switch the unit simply find the one you want on the page and click it. You can view more details on each measurement unit: mile/minute or km/hr The SI derived unit for speed is the meter/second. Verhältnis : 1 min/km = 1.609344 min/mile. Tableau de conversion km/h en min sec/1 km. 9:45 min/mile 585 / 1.61 = 585 / (161 / 100) = 585 x 100 / 161 = … The "four-minute barrier" has since been broken by over 1,400 male athletes, and is now the standard of all male professional middle distance runners in cultures that use Imperial units. Miles to kilometers conversion table miles or km The SI base unit for length is the metre. So for our example here we have 32081 minutes per mile. There are 1.609344 km/m in mi/m. Check the chart for more details. 1.609344 min/mile. 1 mile is equal to 1.609344 kilometers: 1 mi = 1.609344 km. The first one is from Pace (Various Sports).The second one is from Metric. 1 meter/second is equal to 0.03728227153424 mile/minute, or 3.6 km/hr. Use this running pace converter to convert your running pace from minutes per kilometer (min/km) to minutes per mile (min/mile) or from minutes per mile (min/mi) back to minutes per kilometer (min/km). min/km → min/mile. Miles per minute also can be marked as mile/minute. You are currently converting speed units from minute per kilometer to minute per mile 1 min/km = 1.609344 min/mile You can also go to the universal conversion page. 1 km/h = 96.56064 min/mile. Remarque : Vous pouvez augmenter ou diminuer la précision de cette réponse en sélectionnant le nombre de chiffres significatifs souhaités dans les options au-dessus du résultat. This is a conversion chart for minutes per mile (Pace (Various Sports)). But when I stated talking with other runners, mph didn't mean as much to them as min/mile. 2 min/mi to min/km = … Miles per minute to Kilometers per hour formula Kilometers per hour. ›› Quick conversion chart of mile/hour to km/min The surface density of a two-dimensional object, also known as area or areal density, is defined as the mass of the object per unit of area. Once you know what 1 min/mi is in minutes per kilometre, you can simply multiply by the total minutes per mile you want to calculate. Verhältnis : 1 min/mile = 0.62137119223733 min/km. 1 mile per minute (mi/min) = 1.609344001 kilometer per minute (km/min). Convertissez Milles à Kilomètres. 1 km. 1 km. How to convert miles to kilometers. 5 km. 2018, milles par minute en kilomètres par minute, kilomètres par minute en milles par minute (Changer d'unités), Montrer le résultat au format exponentiel, termes et conditions, politique de confidentialité. Click the "Customize" button above to learn more! Click the "Customize" button above to learn more! Convert 20 kilometers to miles: How many minutes per mile in 25 miles per hour: If v mi/h = 25 then v min/mi = 2.4 min/mi. Convertir minute par mille en minute par kilomètre. We've created a run pace converter chart below that converts all these units and also shows how they relate to common race distances and lap times. So for our example here we have 22200 minutes per mile. 5:30 min/km 330 x 1.61 = 330 x 161 / 100 = 53130 / 100 = 531 min/mile → min/km What is kilometers per minute (km… 15 km. ~= 1 min/mile 36 sec/mile 3/5 sec/mile. Also, explore tools to convert kilometer/minute or kilometer/hour to other speed units or learn more about speed conversions. Minutes per mile. It was first achieved in 1954 by Roger Bannister, at age 25, in 3:59.4. Convertissez Miles par heure à Kilomètres par minute Kilomètres par minute . How many minutes per mile in 95 kilometers per hour: If v km/h = 95 then v min/mi = 1.0164277894737 min/mi Marathon * If you maintain the speed, you will run the above distances at the equivalent time. 10 km. It omit below 0.01. km = miles 2. It measures the number of kilometers traveled in a minute. Kilomètres. Minutes/mile For your convenience: 5K = 3.106856M 7K = 4.3495984M 8K = 4.9709696M 10K = 6.213712M. Subtract the minutes so that you’re left with just the decimal that represents the number of seconds, and then multiply that decimal amount by 60. Distance* Tid. Note that rounding errors may occur, so always check the results. Seconds per meter Seconds per yard Minutes per mile Seconds per mile Minutes per km Seconds per km Seconds per (100 meters) Seconds per (100 yards) Relation de base : 1 km/h = 96.56064 min/mile. d (mi) = d (km) / 1.609344 . Convierte fácilmente un montón de otras unidades sobre la temperatura, área, volumen, masa y longitud. The kilometer/minute [km/min] to kilometer/hour [km/h] conversion table and conversion steps are also listed. Si vous constatez une erreur sur ce site, nous vous serions reconnaissants de nous la signaler en utilisant le lien contact en haut de cette page et nous nous efforcerons de la corriger dans les meilleurs délais. How to calculate averge running speed. ~= 1 min/mile 36 sec/mile 3/5 sec/mile. Miles pr time. A four-minute mile is the completion of a mile run (1.6 km) in four minutes or less. The running Pace Converter will also show you your running pace in kilometers per hour (km/hr) and miles per hour (miles/hr). Divide the total time in minutes for the run with the distance (after converting miles to km), this will the give the min/km pace. If you run 1mile in 7 minutes, you run 8.5miles in 1 hour, and run 1km in 4 minutes 20 seconds. Convert 20 miles to kilometers: d (km) = 20mi × 1.609344 = 32.18688km. Calculate how much of this gravel is required to attain a specific depth in a cylindrical, quarter cylindrical or in a rectangular shaped aquarium or pond [ weight to volume | volume to weight | price ], Molybdenum hexacarbonyl [Mo(CO)6] weighs 1 960 kg/m³ (122.3588 lb/ft³) [ weight to volume | volume to weight | price | mole to volume and weight | mass and molar concentration | density ], Volume to weight, weight to volume and cost conversions for Refrigerant R-134a, liquid (R134A) with temperature in the range of -51.12°C (-60.016°F) to 71.12°C (160.016°F), A foot-pound (ft-lb) is a non-SI (non-System International) measurement unit of energy or heat. Note that rounding errors may occur, so always check the results. Nos termes & conditions peuvent être consultés ici : termes et conditions, politique de confidentialité. km/min↔mm/s 1 km/min = 16666.666944 mm/s km/min↔um/s 1 km/min = 16666666.944445 um/s km/min↔mi/s 1 mi/s = 96.560668264209 km/min km/min↔mi/min 1 mi/min = 1.6093445142367 km/min km/min↔mph 1 km/min = 37.282231 mph km/min↔mi/d 1 km/min = 894.779982 mi/d km/min↔Nautical mile (international)/hour coefficient: 32.397409 minutes per mile. 2 km. By Ben Hobson. 15 km. How to convert minutes per mile to minutes per kilometer [min/mi to min/km]: How many minutes per kilometer in a minute per mile:If vmin/mi = 1 then vmin/km = 0.621371192237 × 1 = 0.621371192237 min/km, How many minutes per kilometer in 2 minutes per mile:If vmin/mi = 2 then vmin/km = 0.621371192237 × 2 = 1.242742384474 min/km. 5:10/mile or 3:13/km Training Through Pace and Heart Rate Pace is a rate of activity or movement, while heart rate is measured as the number of times that a person's heart contracts over a minute. Note: Minute per mile is an imperial or United States customary unit of speed. To switch the unit simply find the one you want on the page and click it. Autres conversions possibles d'unités de vitesses. page 2 of 2 www.runningtrainingplan.com ©Running Training Plan mile/h km/h min/mile min/km … To convert from min/km to min/mile multiply the input seconds by the distance constant. Step on a treadmill however, how do you key in your speed? For example, if the treadmill says you’re running 7.1 miles per hour, divide 60 by 7.1, and you get 8.45 (almost 9 minutes). If you enter the distance of either km or mile in a following box, and you click "calculate" button, then it convert to another. Road speed limits are given in kilometers per hour which is abbreviated as kph or km/h. 1 metre is equal to 0.00062137119223733 miles, or 0.001 km. Time Pace (min/km):: +options. In this case, all you need to know is that 1 min/mi is equal to min/km. dwt/Ų to st/µm² conversion table, dwt/Ų to st/µm² unit converter or convert between all units of surface density measurement. Distance in miles . In this case, all you need to know is that 1 min/mi is equal to min/km. From min/km to min/mile, what pace to run for what time in 5K, 10K, half marathon and marathon. 5 km. Minute pro Meile. Hi people, Got the watch yesterday and love it so far.....but I have set the Garmin connect app and device to both use metric and KMs. Exchange reading in kilometers per minute unit km/min into miles per hour unit mph as in an equivalent measurement result (two different units but the same identical physical total value, which is also equal to their proportional parts when divided or multiplied). Relation de base : 1 min/mile = 96.56064 km/h. Minutes . The symbol for kilometers per minute is km/m and the International spelling for this unit is kilometres per minute. Note that rounding errors may occur, so always check … It measures the number of miles traveled in a minute. Voir le procédé ... Unité de longueur égale à 1760 verges . Convert pace to speed, and speed to pace both mile and km. The running Pace Converter will also show you your running pace in kilometers per hour (km/hr) and miles per hour (miles/hr). dernière mise à jour de cette page :: jeu. Use this running pace converter to convert your running pace from minutes per kilometer (min/km) to minutes per mile (min/mile) or from minutes per mile (min/mi) back to minutes per kilometer (min/km). Kilometer Per Minute (km/min) is a unit of Speed used in Metric system. To switch the unit simply find the one you want on the page and click it. Minutes per 400 m. Minutes per 1500 m. Minutes per 800 yards . 96.56064 min/mile ~= 96 min/mile 33 sec/mile 5/8 sec/mile. Example. Kilometre per hour. This page features online conversion from minutes per mile to minutes per kilometer.These units belong to the same measurement system: Pace (Various Sports). Divide 60 by whatever miles per hour the treadmill displays. kilomètres par heure . The first one is from Pace (Various Sports).The second one is from Metric. 10 km. c, the speed of light in vacuum, a universal physical constant, is the only obvious choice.