BRM Checkpoint Time Calculator for Event Organisers

Planning an Audax brevet or randonneur event? Getting checkpoint timings right is critical for rider safety and ACP compliance. This free Audax ride calculator instantly computes opening and closing times for your entire route – from start to finish, including every control point. Simply enter your start time, total distance, and checkpoint distances, and the calculator does the rest using official 15 km/h minimum and 30 km/h maximum speed rules. Whether you’re organizing a 200 km populaire or a 1200 km super randonnée, this tool eliminates manual calculation errors and saves hours of planning time. Used by Audax clubs, ride organizers, and long-distance cyclists worldwide.

What Is a BRM Time Calculator?

A BRM (Brevet Randonneurs Mondiaux) time calculator is a specialized tool that computes opening and closing times for every checkpoint on an ACP-sanctioned brevet.

Unlike a standard time calculator, this tool follows the unique ACP formulas:

• Opening times are based on maximum allowed speeds (34 km/h → 32 km/h → 30 km/h → 28 km/h depending on distance segments)
• Closing times follow minimum required speeds (20 km/h with a 1-hour buffer for the first 60km, then 15 km/h, then 11.428 km/h for long distances)

These aren’t arbitrary numbers. They come directly from Article 10 of the official ACP Rules for Randonneurs Mondiaux (January 2024) . Our calculator implements them faithfully.

Why You Need This Tool Before Your Next Brevet

1. Eliminate Race-Day Anxiety

You have enough to worry about — navigation, nutrition, mechanical issues, sleep deprivation. Calculating control times should not be one of them.

With the BRM Time Calculator, you simply:

• Select your total distance (200km to 1000km)
• Pick your start date and time using the calendar picker
• Add custom checkpoints (or use the recommended presets)

Instantly, you see every control point with its opening time, closing time, and the time window you have to get through.

2. Perfect for Training and Strategy

Want to know if a 14-hour 200km pace is realistic? The calculator shows you. Planning a “Super Randonneur” series (200+300+400+600km in one year)? This tool helps you plan each ride.

The visual time progression chart shows you at a glance where the tightest windows are. You’ll see exactly which sections demand your fastest riding and where you have buffer time.

How to Use the BRM Time Calculator

Using the tool takes less than 30 seconds. Here’s a step-by-step walkthrough:

Step 1: Select Your Distance

Choose from 200km, 300km, 400km, 600km, or 1000km. The overall time limit automatically adjusts:

• 200km → 13 hours 30 minutes
• 300km → 20 hours 00 minutes
• 400km → 27 hours 00 minutes
• 600km → 40 hours 00 minutes
• 1000km → 75 hours 00 minutes

Step 2: Pick Your Start Date & Time

Use the datetime-local picker to set your actual start. The calculator uses this to generate real clock times for every control.

Step 3: Add Checkpoints

• Click “Add recommended” for sensible default checkpoints
• Or enter specific distances manually (e.g., “87”, “142”, “278”)
• Remove any checkpoint with a single click

Step 4: Read Your Results

The tool displays:

• Opening time — earliest you can arrive (prevents riding too fast)
• Closing time — latest you can arrive before disqualification
• Time window — how many hours and minutes you have at that control
• Minutes from start — for precise pacing

Step CSV export to save your plan or share it with your team.

How the Calculations Work (For the Nerds)

The BRM Time Calculator implements the exact formulas from the Audax Club Parisien Rulebook, Article 10.

Opening Time Formula

0 – 200 km:   T = Distance / 34 km/h
201 – 400 km: T = Distance / 32 km/h
401 – 600 km: T = Distance / 30 km/h
601 – 1000 km: T = Distance / 28 km/h

Result rounded to the nearest minute.

Closing Time Formula

0 – 60 km:    T = 1 hour + (Distance / 20 km/h)
61 – 600 km:  T = Distance / 15 km/h
601 – 1000 km: T = Distance / 11.428 km/h

Result rounded to the nearest minute.

The start checkpoint always closes 1 hour after opening (so you can’t arrive at 0km and immediately leave — you have to wait).

The finish checkpoint uses the overall time limit, not the closing formula.

Why Trust This Calculator?

The BRM Time Calculator is built directly from the ACP Rules for Randonneurs Mondiaux (January 2024 edition) . Every formula has been double-checked against the official rulebook, pages 1-3.

Key rules implemented:

• Article 6 — Night riding lights and reflective vest requirements are noted in the tool
• Article 7 — Self-supported reminder (no follow cars)
• Article 8-9 — Checkpoint validation procedures
• Article 10 — Speed calculations exactly as specified
• Article 13 — Super Randonneur title and medal information

You’re not guessing. You’re using the official numbers.