Cycling FTP & Power Zone Calculator
Calculate your personalized cycling training zones based on your Functional Threshold Power (FTP) or 20-minute test power output.
Dividing workouts into power targets optimizes aerobic base capacity, lactate shuttle, and glycogen storage thresholds by activating specific slow-twitch or fast-twitch muscle fibers.
Promotes recovery, flush metabolic waste. Easy conversation pace.
Base building, fat oxidation, mitochondrial development.
Aero capacity, sustained effort, sweet-spot prep.
Increase threshold tolerance, time trial pace. Highly taxing.
Expand max oxygen processing, short punchy intervals (3-8 min).
High-intensity intervals (30s to 3m) to deplete anaerobic capacity.
Peak sprinting capacity, out of the saddle maximum efforts (<15s).
Explore Additional Utilities
Animal Feed & Dry Matter Calculator
Convert animal body weight percentage dry matter intake (DMI) to daily feed requirements in kg/lbs, based on feed dry matter ratio and species presets.
Beaufort Wind Force Scale
Convert wind speed units and classify storm conditions on the official Beaufort maritime wind power scale.
Numerical aperture ↔ acceptance angle — fiber coupling
Determine light coupling capabilities, supported modes, V-numbers, and acceptance cone widths for optical optical fibers.
CPU clock cycles ↔ instructions per second
Translate CPU frequencies, core counts, and performance CPI/IPC values into Millions of Instructions Per Second (MIPS).
Spring rate — lb/in ↔ N/mm — suspension setup
Convert suspension coil spring stiffness between lb/in and N/mm. Estimate coil spring rates using wire diameter, coil diameter, and active counts.
Water cement ratio ↔ compressive strength
Estimate 28-day concrete compressive strength from the water-cement (W/C) ratio using Abrams' Law, or solve for desired strengths.
Length Converter
Convert between meter, kilometer, centimeter, mile, yard, foot, inch, and more.
Unix Epoch Converter
Convert Unix epochs (seconds/milliseconds) to human-eye standard DateTimes, and transform local dates to Epoch times.
Clothing Size Converter
Convert apparel sizes (XS to 3XL) across US, UK, European, and Asian standards.
Packet size ↔ transmission time — network planning
Model network serialization delays and transit times across various network speeds and bandwidth options.
Frequency ↔ wavelength — antenna length calculation
Determine electromagnetic wavelength from frequency and velocity factors. Get recommended quarter-wave and half-wave antenna lengths.
Tidal Rule of Twelfths Calculator
Estimate hourly tide heights and flow volumes between high and low tide periods using the standard maritime rule.
Barometric Altimeter Settings
Calibrate pressure settings between QNH and QFE based on airfield elevation and temperature.
Ink coverage — % coverage ↔ grams per sq meter
Estimate wet/dry printing ink consumption and layer weight based on sheet area and CMYK channel coverage percentages.
Shorthand speed — words per minute ↔ strokes
Analyze cursive shorthand writing velocities (Gregg, Pitman, Teeline) to compare stroke density limits and WPM targets.
Net metering — units exported ↔ bill credit estimate
Estimate utility bill credits, net energy offsets, and financial yields under 1:1 net metering or dual-rate net billing programs.
Maritime & Aviation Speed
Convert maritime knots, airspeed parameters, and hourly nautical coordinates.
Cable loss — frequency + length → signal attenuation
Estimate transmission line losses and remaining signal power for standard coaxial cables and optical fiber spans.
Translation Pages & Pricing Converter
Convert document page count to word and character counts, and calculate translation pricing for multiple languages and target audiences.
Zipper Length & Size Converter
Convert zipper lengths between centimeters and inches, and explore standard zipper gauge size applications.