How hard was it?
Tell Calcpace how a run felt — Easy, Moderate, Hard or Max — and your fitness, zones and predictions stop being dragged down by easy days.
Die Beiträge erscheinen auf Englisch.
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The numbers, reviewed
Cameron's real formula, age grades on the 2025 road tables, and heat and altitude refitted to published data. Some numbers moved a little.
Result Breakdown: everything one time says
Type a race and a time — or open one of your runs — and see pace, predictions, VO2max, training paces, splits and what heat did, on one page.
Made for your phone
Calcpace is being tested on Google Play. The app now opens in your language, with a tab bar for everyone and a Performance tab of its own.
A race calendar you can trust
Every race checked against its organiser, a page of its own in fifteen languages, filters by country and distance, and the races near you.
Your zones, without a signal
A Zones page the installed app keeps on your phone — open it at the trailhead, in airplane mode, and it is there.
Sign in with Strava or Google
One click signs you in — or creates your account. Strava arrives already connected; Google arrives already verified.
Imported runs, in full
Strava runs now arrive with splits, an age grade and race detection, any distance gets a race prediction, and connecting Strava is easy to find.
Calcpace, on your phone
Install it like an app, pick a time without hunting for colons, and turn any run you see into a race prediction with one tap.
Share your pace — and a lot more
A share button on every page, link previews that work, one clean time format everywhere, and activities that trust their own GPS file.
A pace conversion guide, in fifteen languages
How to turn min/km into km/h, min/mi into mph, and one into the other — with a reference table. Plus durations that finally read like durations.
Private by default
New activities start private, public links are unguessable, and one click flips a run either way. Plus heart rate and training zone on the activity page.
Looking forward, and asking first
Race projections, training pace zones and a six-month fitness trend — plus explicit consent for the heart rate and VO2max data that feeds them.
A VO2max that admits what it knows
Every estimate now carries a confidence level and a note explaining it — heart rate, elevation and duration all change how much to trust the number.
Connect Strava
Link your Strava account and your runs come across on their own — route, distance, elevation, heart rate and a VO2max estimate for each one.
Answers on the page
Public pages now end with the questions people actually ask, in every language — and a GPX upload fills in your distance and elevation properly.
Numbers with context
A full stats row over any date range you choose, and temperature and altitude as inputs — because a 5:30 in the heat is not the 5:30 you ran in October.
Find a race, rate the run
A race calendar you can filter by date and continent, race distances that read in your own language, and age grading in the calculator.
Your units, your language
A km/mi toggle on the splits table, distances that survive the round trip between units, and six more languages in the picker.
World records and a pace chart
Two new reference pages: the official world records with the pace behind each one, and a chart running from 2:50 to 8:00 per kilometre.
Six languages, and a menu that fits
Calcpace now speaks English, Portuguese, Spanish, German, French and Japanese — with a language switcher, and a mobile menu that finally works.
Open to everyone, with maps
Registration is open — no invite code. Upload a GPX file and get your route on a map, per-kilometre splits, elevation and a VO2max estimate.
Your log, and your account
Period filters, a stats row, editing, sessions and a CSV export — plus new accounts now confirm their email before signing in.
Accounts, by invitation
Calcpace grows a log-in. Registration is invite-only for now, with single-use codes bound to the email they were sent to.
Calcpace is now a website
The pace maths that used to live in a Ruby library is now a free website: pace, finish times, splits, race predictions and a unit converter.