RunCalcs magazine

Tools, training notes, and race guidance for runners who like useful numbers.

Start with the latest guide, jump into a calculator, or browse a curated issue on pacing, recovery, data, and marathon preparation.

Read the Front Page Open Calculators Browse Sessions Plan Your Week

Front Page

The newest feature and the pieces worth opening first.

View all

Illustration of a running watch showing pace and heart rate metrics

Gear New Jun 4, 2026

Running Watch Features Guide

Which watch features actually matter: GPS accuracy, heart rate, training load, recovery, navigation, safety, battery life, durability, and app support.

Illustration of an easy Zone 2 heart rate gauge

Training Apr 3, 2026

Zone 2 Running Pace Guide

Use effort, talk test, and heart rate to estimate Zone 2 pace for easy runs and long runs.

Illustration of an age-based marathon pace chart

Data Apr 2, 2026

Marathon Pace Chart by Age

Compare marathon pace targets by age with VO2 max context and heart-rate zone references.

Tool Desk

Fast calculators for pacing, prediction, zones, recovery, and race execution.

See all tools

Most used Pace Calculator Convert distance, pace, speed, and finish time. Race Time Predictor Project finish times from a recent result. Heart-Rate Zones Set easy, tempo, and interval ranges. VO2 Max / VDOT Estimate fitness and training paces. Splits Planner Plan even or negative splits for any race. Run/Walk Calculator Build beginner-friendly interval plans. Recovery & Rest Estimate when to absorb the work. Weight Impact Model how weight changes can affect pace.

Departments

Issue Sections

Curated reading paths when you want the next useful answer.

Browse archive

Beginners

Start Running

Build consistency without turning the first month into a survival test.

Guide How do I start running? Plan From non-runner to your first parkrun Skill Running cadence guide

Race build

Marathon File

Race-specific pacing, tapering, long-run, and finish-time references.

Pacing 4 hour marathon pace Training How long should my long run be? Race week Marathon taper plan

Body desk

Injury & Recovery

Practical context for common injuries and the decisions around return-to-run.

Diagnosis Knee pain guide Return Return to running after injury Mindset Why runners ignore physio advice

Workout Notebook

Open a workout, view the breakdown, and print the details.

View sessions

Speed & turnover 5K turnover on the track Print-ready Tempo strength Tempo ladder session Balanced load Race specificity Marathon pace alternations Goal pace

How to use RunCalcs running calculators

Follow these steps to turn your running data into actionable training plans and realistic race goals.

Pick the right tool: Start with the pace calculator or race predictor depending on whether you have a goal time or recent result.
Dial in training zones: Use the heart-rate zones or VO₂ / VDOT tools to map intensity ranges for easy, tempo, and interval workouts.
Plan the week: Combine your paces with the splits planner and recovery guide to balance stress and rest across your schedule.

Bookmark this page so you can quickly compare calculators and revisit fresh training articles as your season evolves.

Companion application

Take Runcalcs on the go with our iOS app.

Frequently asked questions

What makes RunCalcs different from other running sites?

RunCalcs keeps the focus on evidence-based advice and accurate running calculators. Instead of overwhelming you with ads or pop-ups, the site highlights the most useful tools and reading so you can take action quickly.

Are the calculators suitable for new and experienced runners?

Yes. Each calculator includes guidance, examples, and pacing tables so beginners understand the results while experienced runners can move straight to the numbers they need for training and race planning.

How often are the training articles updated?

The editorial team reviews new science and proven coaching practices regularly. When better research becomes available, the guidance is refreshed to keep the advice current.