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◆ FIELD TOOLS · EST. 2026

TOOLS
FOR THE
JOB.

Twelve calculators and references every working cop ends up Googling mid-shift. Built by the people who make your off-duty shirts. No sign-up, no paywall, no telemetry.

24Field Tools
0Sign-ups
0Data Sent
∞Free Access
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Why we built this

13 Fifty Apparel has made gear for law enforcement since day one. The tools on this page came from real requests — stuff guys were Googling on duty, off duty, in court, and at the range. Every one of them runs in your browser. Nothing gets uploaded, logged, or sent to a server. You can close the tab and walk away clean.

What's here

Ten-code reference for general, LAPD, and CHP usage. NATO phonetic alphabet translator. Ballistics calculator for trajectory, drop, and wind drift. MOA-to-MIL conversions for scope adjustments. Mil-dot range estimation from a reticle read. Skid-to-speed formula for traffic reconstruction. Radar cosine effect calculator. Pursuit and stopping-distance math. BAC estimator using the Widmark formula. FLSA §207(k) overtime calculation for the 7- to 28-day work period. Duty belt weight tracker. 24-hour military time converter.

Important note on accuracy

These tools provide estimates only. Ballistics calculations are simplified and do not account for all atmospheric variables — use Hornady 4DOF or Applied Ballistics for duty use. BAC estimates are educational — a Widmark calculation is not admissible in place of an actual breath or blood test. Traffic reconstruction formulas assume constant drag factors and are a starting point for investigation, not a substitute for an accident reconstructionist. Use these like you'd use any reference — verify before acting.

TOOL 01 / REFERENCE

Ten-Codes

General, APCO, and agency-specific ten-codes. Searchable. Print-ready.

Database
CodeMeaning
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TOOL 02 / REFERENCE

NATO Phonetic

Translate between plain text and Alpha-Bravo-Charlie for clean radio traffic and plate callouts.

Translator
Output
Reference Chart
LetterNATO WordPronunciation
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TOOL 03 / REFERENCE

Military Time

24-hour clock conversion for report writing. Keep your times clean and consistent.

12-Hour → 24-Hour
0100 hrs
Military Time · Spoken: Zero One Hundred
24-Hour → 12-Hour
1:50 PM
Standard Time
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TOOL 04 / FIREARMS

Ballistics Calculator

Simplified trajectory, drop, and wind drift. Good for training range and reference — use full ballistic software for duty work.

Inputs
Model: Simplified G1 drag function with standard atmosphere (59°F, sea level). Does not account for spin drift, Coriolis, or variable air density. Training reference only.
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TOOL 05 / FIREARMS

MOA / MIL Converter

Convert between minutes of angle and milliradians. Calculate adjustments in inches at range.

Angle Converter
Reference: 1 MOA = 1.047″ at 100 yd · 1 MIL = 3.6″ at 100 yd · 1 MIL ≈ 3.438 MOA
Inches at Range
3.14 inches
Point of impact shift at target
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TOOL 06 / FIREARMS

Mil-Dot Range Estimator

Estimate target distance from the number of mils your target spans in the reticle.

Calculator
—
Yards
—
Meters
Formula: Distance (yards) = (Target inches × 27.778) / Mils · Distance (m) = (Target cm × 10) / Mils · Common references: adult male ≈ 70″, car door ≈ 48″, license plate ≈ 12″.
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TOOL 07 / TRAFFIC

Skid-to-Speed

Estimate minimum initial vehicle speed from skid mark length using the standard drag-factor formula.

Inputs
— mph
Minimum initial speed (before braking)
—
Formula: S = √(30 × d × f × n) where d = skid length (ft), f = drag factor ± grade, n = braking efficiency. Returns minimum speed — actual speed was higher due to pre-skid braking, reaction, and non-locked deceleration.
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TOOL 08 / TRAFFIC

Radar Cosine Effect

True vehicle speed accounting for the angle between radar beam and vehicle path. The cosine effect always favors the driver.

Calculator
— mph
True vehicle speed
—
Formula: True speed = Measured speed ÷ cos(angle). The cosine effect ALWAYS reads low, never high — it favors the driver. At 15°, error ≈ 3.4%. At 30°, error ≈ 13.4%. Keep angles under 10° whenever possible.
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TOOL 09 / TRAFFIC

Stopping Distance

Reaction distance + braking distance at a given speed and surface condition.

Calculator
—
Reaction (ft)
—
Braking (ft)
—
Total (ft)
—
Total (m)
Formulas: Reaction distance = Speed (mph) × 1.467 × Reaction time. Braking distance = Speed² / (30 × drag factor). Standard perception-reaction time is 1.5 s per AASHTO.
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TOOL 10 / TRAFFIC

BAC Estimator

Widmark formula blood alcohol estimate. For reference and training — not admissible in place of breath or blood.

Inputs

Drinks Consumed

0.000 BAC
No alcohol consumed
Formula (Widmark): BAC = (oz alcohol × 5.14 / weight lbs × r) − (0.015 × hours). Accuracy ±0.02 in most cases. Does not account for food, medications, metabolism variance, or time-to-absorption. For educational and training purposes only.
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TOOL 11 / DUTY

FLSA §207(k) Pay

Overtime calculation under the law enforcement partial exemption. Work-period based, not weekly.

Inputs
—
OT Threshold (hrs)
—
OT Hours
—
Straight Pay
—
OT Pay
—
Total Gross
FLSA §207(k): Law enforcement OT thresholds per 29 CFR 553.230 — 7-day: 43 hrs · 14-day: 86 hrs · 21-day: 129 hrs · 28-day: 171 hrs. Hours beyond the threshold are paid at 1.5× the regular rate. Check your CBA — many departments negotiate more generous terms than the federal minimum.
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TOOL 12 / DUTY

Duty Belt Weight

Add up what's riding on your hips. The average duty belt runs 15-25 lbs before vest and armor. Your lower back wants to know.

Inventory
0.0 lbs
Total duty belt weight · 0.0 kg
—
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TOOL 13 / INVESTIGATION

Miranda Rights Card

Standard Miranda warning in English and Spanish. Printable wallet format with comprehension check questions. Review your department's exact policy — this is the federal baseline.

Language
Miranda Card
Legal note: Miranda v. Arizona (1966) requires this warning before custodial interrogation. Phrasing varies by jurisdiction — when in doubt, read verbatim from your agency's issued card. Failure to Mirandize does NOT invalidate an arrest, only statements made during custodial interrogation.
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TOOL 14 / INVESTIGATION

Penal Code Lookup

Commonly-referenced criminal statutes for the 10 biggest US states plus federal Title 18/21/8. Pick your state — we'll remember it. Always verify against the official state code before charging.

Jurisdiction
CodeCategoryDescriptionClass
Reference only: Criminal codes change every legislative session. Always confirm current code language, degree, and punishment in the official statute before charging or in court documentation. Link to your state's official code is shown above the table.
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TOOL 15 / INVESTIGATION

VIN Decoder

Decode a Vehicle Identification Number. Extracts country, manufacturer, model year, plant, and validates the check digit per ISO 3779.

Input
Example VINs: 1HGBH41JXMN109186 (Honda) · 1FTFW1ET5DFC10312 (Ford F-150) · 5YJ3E1EA7JF006884 (Tesla)
Positions: 1–3 WMI (World Manufacturer) · 4–8 VDS (vehicle attributes) · 9 Check digit · 10 Model year · 11 Plant · 12–17 Serial. Full make/model/trim decoding requires a paid database (NMVTIS, NHTSA API). This tool gives reliable country, make, year, and checksum validation.
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TOOL 16 / INVESTIGATION

Pursuit Decision Matrix

Score the pursuit factors most policies require you to weigh — severity, conditions, risk. The output is a framework for articulation, not a replacement for your agency's policy.

Factor Assessment
— / 30
Answer the factors above
Articulation framework: Modern pursuit policy (IACP, most state POSTs) requires officers to continuously assess severity of offense, risk to public, apprehension likelihood, and alternatives. This tool mirrors those factors so you can document your decision calculus. Not a substitute for your agency's pursuit policy.
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TOOL 17 / INVESTIGATION

Report Templates

Fill-in templates for common narratives. Auto-formats the structured data into the standard report language.

Template Type
Fields
Generated Narrative
Copy this into your RMS
These are starting points. Every agency has specific report formatting requirements — use these to draft, then edit into your department's RMS format. Write in first person, chronological, and articulate training/experience for any conclusions drawn.
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TOOL 18 / TRAINING

Phonetic Alphabet Drill

Timed flash-card practice. Get the NATO phonetic locked into muscle memory before your first plate callout.

Drill Mode
0 / 20
Round
0
Correct
0
Wrong
0.0s
Avg Time
Press Start to begin
—
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TOOL 19 / HAZMAT

HAZMAT Placard Lookup

Look up DOT hazmat placard classes and UN/NA 4-digit identification numbers. Know what's on the truck before you approach.

9 Hazard Classes
UN/NA Number Lookup
UN/NAClassMaterialERG
Approach safety: Stay upwind, uphill, and upstream. Use binoculars to read placards from distance. Minimum initial isolation for inhalation hazards is 300 ft (small spill) to 3,000+ ft (large spill). Consult the Emergency Response Guide (ERG) — free download from PHMSA — for specific response protocols. This tool is a quick-reference index; the ERG is the authoritative field guide.
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TOOL 20 / FIELD MEDICAL

CPR Reference

Current AHA Basic Life Support reference — 2025 guidelines. Refresher for on-scene response while waiting for EMS. Not a substitute for certification.

Patient Age
Critical Numbers
Step-by-Step
    AED Quick Reference
    Critical: Start chest compressions within 10 seconds of determining the person is unresponsive and not breathing normally (or only gasping). Every minute without CPR drops survival by ~10%. Source: American Heart Association 2025 BLS Guidelines. This is a refresher — complete a BLS course for hands-on training.
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    TOOL 21 / FIELD MEDICAL

    Trauma Response

    Massive bleeding, airway, and trauma intervention reference. Per Committee on Tactical Combat Casualty Care (TCCC) and Stop The Bleed protocols.

    MARCH Assessment
    Select Injury Type
    Scene safety first: No rescuer becomes a second casualty. Neutralize threats before rendering aid. Universal precautions — gloves minimum, eye protection for airway interventions. Call for EMS before or during intervention. This is battlefield-tested guidance for the gap between injury and EMS arrival — not a substitute for Stop The Bleed or TCCC certification.
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    TOOL 22 / CRIME SCENE

    Scene Best Practices

    First-responder scene management best practices. General principles from IACP and IAI guidance — follow your agency's specific SOPs.

    Response Phase
    Common Mistakes
    Follow your agency SOP first. This is generic guidance drawn from IACP model policies and IAI best practices — your department's specific procedures take precedence. Every scene is different. The consistent theme: secure, document, preserve, notify, don't touch what you don't need to.
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    TOOL 23 / CRIME SCENE

    Evidence Log

    Chain-of-custody worksheet. Fill, print, attach to your case file. Data stays in your browser — nothing saved to any server.

    Case Info
    Items
    Preview (print-ready)
    Chain of custody: Every transfer of the item between people must be logged — collecting officer → evidence clerk → lab → return. Gaps in chain can exclude evidence at trial. This form supplements but does not replace your agency's official chain-of-custody form.
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    TOOL 24 / CRIME SCENE

    Photo Log

    Sequential photo numbering with description fields. Stays consistent across your shots for court-ready documentation.

    Case Info
    Photos
    Preview (print-ready)
    Photo sequence: Start with overall/exterior, move to mid-range establishing, then close-up with scale. Each photo should include a number placard in-frame. Never delete originals. Include reference shots (a ruler, known item) for size context.
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