Tools & Calculators

The Runner's
Sandbox.

Free tools for runners — from pace calculators to the full Strava analytics app.

Featured App

Featured

Strava Analytics & Sticker Generator

Crenoe App

Connect Strava and get 16+ advanced metrics per run — Aerobic Decoupling, ACWR, Grade Adjusted Pace, Cadence Variability, and more. Generate AI coaching insights from Cren, track your Fitness & Freshness (CTL/ATL/TSB), and create 46 aesthetic stickers for Instagram Story.

16+ Metrics AI Coach Cren 46 Sticker Templates Fitness & Freshness Free to start
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Running Calculators

Training Pace

Calculate your training pace zones (Easy, Tempo, Interval, VO2 Max) based on your race results.

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Basic Pace Calculator

Quick calculator for average pace in min/km and min/mile.

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Race Predictor

Estimate your finish time for 5K to Marathon using the Riegel algorithm.

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Heart Rate Zones

Calculate HR zones (Z1–Z5) using Karvonen and MHR methods.

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Smart Fueling

Calculate fluid, carbohydrate, and sodium needs for long runs.

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Finish Time Matrix

Full finish time matrix based on your target pace across all race distances.

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