KartingCalculators.com — UK Junior Karting Calculators

How these calculators work

Each tool is a practical model based on common paddock practice. You enter today’s conditions (temps, sprockets, RPM, hours, laps, etc.) and the page instantly returns a recommendation. You can also save your usual values on your device for next time.

Note: Results are guidance, not a guarantee. Always sanity-check against your team’s/engine builder’s advice and your championship rules.

🛞 Tyre Pressure Calculator (Cold → Hot)

Get a sensible starting cold pressure based on track temperature, tyre brand, and your target hot pressure.

Tyre brand

Track temp (°C)

Air temp (°C)

Target hot pressure (PSI)

Session type

Warm-up laps to pace (optional)

⚙️ Gear Ratio + Top Speed

Estimate gear ratio and theoretical top speed from sprockets, RPM, and tyre circumference.

Front sprocket (teeth)

Rear sprocket (teeth)

Max RPM (end of straight)

Tyre circumference (metres)

Speed unit

Optional RPM limit warning

⛽ Fuel Load Calculator

Calculate minimum fuel needed for a race (laps or minutes) plus a safety margin.

Race format

Safety margin (%)

Race laps

Fuel burn per lap (litres)

Fuel density (kg/L) (optional)

Notes (optional)

🔧 Engine Hours & Service Tracker

Track running hours and get a simple “service due” timeline using sensible starter intervals.

Engine

Hours since last full rebuild

Piston interval (hours)

Top-end interval (hours)

Bottom-end interval (hours)

Usage intensity

Starter intervals are conservative guidance. Always follow your engine builder/manufacturer and championship rules.

📉 Tyre Life & Heat Cycle Tracker

Track laps and heat cycles for each set. Get a quick “Race / Practice / Replace” recommendation.

Tyre set name

Tyre brand/compound

Total laps on this set

Heat cycles (sessions run)

Current grip feel

Event importance

📊 Driver Consistency Score

Paste lap times and get a consistency score, best lap, average lap, and a simple cleanliness indicator.

Lap times (one per line or comma-separated)

Outlier handling

Target “within best” delta (seconds, optional)

Tip: 0.30s cadets • 0.20s juniors • 0.15s advanced.

🌡️ Jetting Helper (Weather → Density Altitude)

Turn today’s weather into a practical jetting direction (leaner/richer) plus a baseline note. Best used with your own logbook.

Engine type

Track altitude (metres above sea level)

Air temp (°C)

Relative humidity (%)

Pressure (hPa) (optional)

Your last “good” Density Altitude (m) (optional)

🛠️ Setup Assistant (Caster/Camber/Ride Height/Axle)

Enter grip + symptoms and get recommended adjustment directions (not magic numbers). Do one change at a time.

Track grip level

Track temp feel

Corner entry

Mid-corner

Corner exit

Tyres

UK junior classes this supports

Built for junior karting up to age 16, including (depending on club/series): Cadet (U7/U8/U9), Honda Cadet, IAME Waterswift, Junior Rotax Max, IAME X30 Junior, and OK-Junior.

Want track-specific defaults later (PFI, Whilton Mill, Larkhall, Clay Pigeon, etc.)? Add preset buttons once you’ve logged a few weekends.