Build your Running Pace Calculator with AI in under 5 minutes

Build a running pace calculator: give any two of distance, time, and pace and get the third, in min/km or min/mile, with predicted 5K, 10K, half, and marathon finish times. Runs in the browser.

작동 방식

단계 1

아이디어를 설명하세요

원하는 것을 일반 텍스트 프롬프트로 작성하세요.

단계 2

AI가 빌드합니다

FloopFloop이 즉시 프로덕션 수준의 코드를 생성합니다.

단계 3

배포 및 라이브 공개

프로젝트가 몇 분 안에 자체 서브도메인에 호스팅됩니다.

개발자 고용 대신 AI로 빌드해야 하는 이유는?

FloopFloop기존 개발자
출시 소요 시간5분 이내2~8주
비용$0부터$5,000 - $50,000+
유지 관리포함지속적인 유지보수 계약

What is a running pace calculator?

A running pace calculator ties together the three numbers every runner juggles: distance, time, and pace. They're linked by a single relationship — time equals pace times distance — so if you know any two, the third falls out. Runners reach for one constantly: working out the pace from a training run, figuring how long a race will take at a goal pace, converting a treadmill's min/mile into the min/km their watch shows, or setting splits for a long run. The fiddly parts are the time formats (mm:ss and h:mm:ss), the unit conversion between kilometres and miles, and the arithmetic of turning a per-km pace into a marathon time. A good calculator lets you solve for whichever quantity you don't know, switches units cleanly, and shows what a pace means across the standard race distances so a number becomes a plan.

Common features

  • Solve for pace, time, or distance
  • time = pace × distance
  • min/km and min/mile with a unit toggle
  • mm:ss and h:mm:ss time parsing, validated
  • Per-km ↔ per-mile pace conversion
  • 5K / 10K / half / marathon finish-time predictions
  • Clear which field is input vs. calculated
  • Instant, browser-side calculation
  • Inputs remembered on the device
  • Light and dark themes

Real-world examples

Finding your pace

A runner enters 10 km and 50:00 and reads off a 5:00/km pace, then flips to miles to see it's about 8:03/mile.

Planning a race

Someone sets a 5:00/km pace and the board shows a 3:30:59 marathon, so they know the goal is realistic.

Working back from a goal time

A runner solves for pace from a target half-marathon time to learn exactly how fast they need to run.

Why FloopFloop fits running pace calculator projects

A pace calculator is the kind of tool a runner wants instant, ad-free, and theirs. FloopFloop ships the calculator you want — your usual distances, a splits table, a fade-adjusted race predictor, your club's colours — on your own domain, with every calculation running in the browser. The athletic 'track' board that ships by default puts the result front and centre with race predictions beneath, and it's one prompt away from being whatever fits your training.

이 프롬프트를 사용해 보세요

아래 프롬프트를 복사하여 FloopFloop에 붙여넣고 시작하세요.

Build a running pace calculator. A 'solve for' switch (pace / time / distance): the user fills the other two fields and the chosen one is calculated, related by time = pace × distance. Support both min/km and min/mile with a unit toggle that converts distance and pace. Parse times as mm:ss or h:mm:ss and paces as m:ss, and validate (seconds under 60). Show a board of predicted finish times for 5K, 10K, half marathon (21.0975 km), and marathon (42.195 km) at the current pace. Keep it deterministic so the first render is hydration-safe, and remember the inputs in localStorage. 100% client-side.

Create a pace calculator for runners: enter a distance and time, get my pace per km and per mile, and my predicted race times. Keep it in the browser.

Build a tool that tells me my marathon finish time if I hold a given pace, with a track-style look and a dark theme.

Build a running calculator where I can solve for pace, time, or distance, switching between kilometres and miles.

자주 묻는 질문

How do I calculate running pace?
Pace is your time divided by the distance — run 10 km in 50:00 and your pace is 5:00 per kilometre. The three quantities (distance, time, pace) are linked by time = pace × distance, so the calculator works out whichever one you leave blank from the other two.
Can it switch between km and miles?
Yes — a unit toggle converts both the distance and the pace, so you can read your pace as min/km or min/mile and enter distances in whichever you train in.
What race times does it predict?
It shows your projected finish for the 5K, 10K, half marathon (21.0975 km), and marathon (42.195 km) at the pace you're holding — handy for setting a goal or pacing a long run. (These are simple constant-pace estimates, not fade-adjusted models.)
What time formats does it accept?
Times can be mm:ss (like 50:00) or h:mm:ss (like 1:45:30), and paces are m:ss. It validates the input — minutes and seconds have to be under 60 — so a typo is flagged rather than silently miscalculated.
Is anything uploaded?
No. Every calculation runs in your browser and your last inputs are saved to localStorage only. The single outbound surface is the /api/health probe.

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