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Measurement and planning calculators
Explore 15 free measurement and planning calculators. Calculate in your browser with clear inputs, worked examples, and transparent methods.
15 calculators available
- Battery Energy and Drone Duration
Estimate constant-load flight duration from usable battery capacity, nominal voltage, aircraft mass and watts per kilogram.
- CSS Box Width Height and Ratio
Relate a CSS box’s width and height through selected ratio presets. The 4:3 preset has an independently reviewed arithmetic correction.
- Equal Temperament Fret Positions
Find distances from the nut to all 27 fret positions for an ideal twelve-tone equal-temperament instrument.
- Film Footage Frames and Running Time
Convert film footage, frame counts, frame rate and elapsed running time, including continuous 400 ft and 1,000 ft roll equivalents.
- Fixed Workload Optimization Speedup
Estimate fixed-workload acceleration and elapsed time from optimized task fractions, with one through five disjoint task models.
- Map Vertical and Horizontal Scale
Compare vertical and horizontal scale denominators from real and drawn dimensions. The output is the reciprocal of physical vertical amplification.
- Pixel Rectangle Width Height and Ratio
Use a selected rectangle ratio to relate pixel width and height. This describes the full image shape, assuming square pixels.
- Portrait Width Height and Ratio
Relate portrait rectangle width and height in compatible length units using a selected photographic ratio.
- Pretax Gratuity and Tax Total
Add supplied tax and a gratuity calculated on the pretax amount, with editable net, gross, tip and total amounts.
- Proportional Image Resize Dimensions
Resize a rectangle proportionally from original dimensions and one new dimension, and show its linear size percentage.
- Round Speaker Port Length Model
Estimate the length of equal round speaker ports from diameter, net box volume, tuning frequency and a supplied end correction.
- Screen Width Height and Ratio
Relate screen rectangle width and height using a selected ratio preset or supplied dimensions.
- Shared Bill Gratuity and Total
Calculate gratuity, total bill and equal per-person shares, or solve a missing bill, rate or share.
- Thin Lens Distance and Extension Model
Resolve ideal thin-lens object and image distances from focal length and total subject-to-sensor distance, including a fixed-distance extension model.
- Two Outcome Poker Expected Profit
Balance two exhaustive win and loss probabilities and calculate the average net profit of the supplied poker outcomes.