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Free Tool

RACE WEIGHT CALCULATOR

Your target weight range for peak cycling performance. Based on body composition, not BMI.

Estimate is fine. Most male cyclists are 12-25%. Use a smart scale or caliper test for accuracy.

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Quick answer

Enter height, weight, body fat percentage, gender and event type. The tool returns a target weight range, target body-fat band, weeks to reach it at a safe rate, and a coaching approach tailored to how much change is needed.

WHAT IT DOES

Race weight isn't "the lowest number you've ever seen on the scale." It's the weight at which your power-to-weight ratio peaks for the event you're targeting — and you can hold it without losing power, immune function, or sleep. This calculator gives you a sensible target range, not a single number, and tells you how long it should take to get there.

WHO IT'S FOR

  • →Riders with a specific target event — Etape, Marmotte, hill climb season, gran fondo
  • →Cyclists who suspect they're carrying weight that's costing them W/kg
  • →Athletes who want a body-comp goal that's safe, not punitive
  • →Anyone tempted to crash-diet before a race — please use this instead

HOW IT WORKS

We use gender- and event-specific competitive amateur body-fat ranges (drawn from Jeukendrup & Gleeson) to project a target weight range from your current lean mass. A Miller-formula minimum healthy weight acts as a floor — we never recommend below medically reasonable. Weeks-to-target assumes 0.5% body weight loss per week, the safe maximum before performance suffers.

  1. 01

    Get an accurate body-fat reading

    DXA scan is the gold standard. Bioimpedance scales are noisy but acceptable if used consistently. Skinfolds done by the same practitioner work too. Avoid one-off readings on a friend's scale.

  2. 02

    Enter your inputs

    Height (cm), current weight (kg), body fat (%), gender, and the event you're targeting. Event matters — a hill climb specialist needs a different range than a gran fondo rider.

  3. 03

    Read the target range

    You'll see a target weight range, a body-fat band, and an estimated number of weeks at a safe loss rate. Pick the upper end of the range as your first target — most riders perform better there than at the bottom.

  4. 04

    Pick the right approach

    If you're already inside the range, focus on power and don't lose more. If you're 2-5 kg out, fuel-for-the-work-required nudges will get you there. If you're more than that, treat it as a multi-month project, not a four-week diet.

EXAMPLE CALCULATIONS

Male 75kg, 18% body fat, targeting hill climb season

  • · Height: 180cm
  • · Weight: 75kg
  • · Body fat: 18%
  • · Gender: male
  • · Event: hill-climb

Target range 68-72kg at 7-10% body fat. ~12 weeks at 0.5%/wk. Approach: structured body-comp phase with protein at 1.6-2.2 g/kg.

Female 62kg, 24% body fat, targeting gran fondo

  • · Height: 168cm
  • · Weight: 62kg
  • · Body fat: 24%
  • · Gender: female
  • · Event: gran-fondo

Target range 56-60kg at 18-24%. ~6-10 weeks. Approach: smarter food quality and fuelling timing — no calorie restriction needed.

LIMITATIONS

All body-comp models are estimates — DXA scans vary by ±2% body fat between machines. The calculator can't see your training history, sleep, stress, menstrual cycle, or relative energy availability. The Miller floor is a rough safety guard, not a medical assessment. Treat the output as a sensible target range, not a prescription.

When to see a coach

If you've been below 10% body fat for an extended period, your FTP is dropping, you're getting sick often, or your relationship with food feels difficult — stop using this calculator and speak to a sports dietitian. Race weight without performance is just dieting, and it's the fastest way to end a season.

FREQUENTLY ASKED QUESTIONS

What is race weight in cycling?+

Race weight is the body weight at which your power-to-weight ratio is highest for your target event, while staying healthy enough to train hard. It's a range, not a single number — typically 8-12% body fat for competitive male cyclists and 16-22% for competitive female cyclists, depending on event type.

How fast can I safely lose weight for cycling?+

0.5% of body weight per week is the safe maximum before training quality drops. For a 75kg rider, that's around 375g per week. Faster than this and you risk losing power, immune function, sleep quality, and developing an unhealthy relationship with food. Race weight is a multi-month project, not a four-week diet.

Should I lose weight before a hill climb event?+

If you have body fat to lose, yes — gravity is the dominant force on a sustained climb, so W/kg matters more than absolute watts. But the timing matters: arrive at race weight 2-3 weeks before your event, not on the day. Crash-dieting in the final week typically loses you more power than weight.

What body fat percentage do pro cyclists have?+

Grand Tour climbers typically race at 4-7% body fat for the duration of a 3-week tour. They cannot hold this year-round, and most periodise body composition with the season. Targeting pro values as an amateur is rarely a good idea — the cost in immune function, sleep, and life stress is high.

How accurate is body fat measurement?+

DXA scans are the most accurate widely available method (±2% between machines). Bioimpedance scales are noisy day-to-day but useful if you weigh in consistently — same time, same conditions, and look at the trend over weeks not days. Skinfolds done by the same practitioner are also acceptable. One-off readings on different machines tell you almost nothing.

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