Your clean starting line

Running calculators and training articles to run better.

RunCalcs is a distraction‑free hub for running calculators and training articles so you can plan workouts, dial in pacing, and keep improving.

Open Calculators Read Articles Browse Sessions Plan Your Week Download iOS App

New on RunCalcs

Highlights from our latest updates.

Marathon Taper Plan: 3 Weeks, Week by Week

Use a simple week-by-week taper with mileage cutbacks, intensity guidance, and race-week execution cues.

Read the marathon taper plan New

How Fast Should I Run a 5K?

Use realistic 5K benchmark times, pace chart targets, and a simple race-day pacing plan.

Read the 5K pace guide New

Popular Calculators

Get precise paces and realistic targets.

See all tools

Pace Calculator

Convert between pace, speed, and finish time.

Open pace calculator km / mile

Run/Walk Calculator

Plan beginner-friendly intervals and estimate total time.

Open run/walk calculator Intervals

Race Time Predictor

Predict finish times from your recent race.

Open race predictor 5K → Marathon

Heart‑Rate Zones

Calculate easy, tempo, and interval zones.

Open HR zone tool %Max or LTHR

VO₂ Max / VDOT

Estimate aerobic fitness and training paces.

Open VO₂ / VDOT Jack Daniels

Splits Planner

Plan even or negative splits for any distance.

Open splits planner Negative / Even

Recovery & Rest

Guidelines for bounce‑back days and weeks.

Open recovery guide Smart rest

Training sessions

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

View sessions

Speed & turnover

Sharpen cadence before a 5K or 10K.

5K turnover on the track Print-ready

Tempo strength

Build threshold control with layered efforts.

Tempo ladder session Balanced load

Race specificity

Blend steady and marathon-pace blocks.

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.