LBS to Stones Converter — Convert Pounds to Stones (Exact: st = lb ÷ 14)
Accurate pounds (lb) to stones (st) converter using the exact definition 1 stone = 14 lb. Ideal for UK/IE body weight, sports weigh-ins, fitness dashboards, and mixed-unit reports where stones are still used alongside SI units.
Exact factors: 1 st = 14 lb ⇒ st = lb ÷ 14. For more mass tools, visit our weight metric conversion hub.
About Pounds to Stones Conversion
The pound (lb) is widely used in the United States and appears on scales, retail packaging, and fitness equipment. The stone (st) remains popular in the UK and Ireland for describing personal body weight and for broadcast or sports commentary. Converting pounds to stones gives you a format that reads naturally for UK/IE audiences while keeping your data aligned with standardized constants. If your product serves multiple regions, showing stones and pounds alongside kilograms is a simple way to speak everyone’s language. Explore all mass calculators on our free weight metric tools page.
Because the definition is exact—1 stone = 14 pounds—you can safely present stones for readability without sacrificing precision. Store your canonical values in kilograms for analytics and interoperability, then compute stones and pounds on the fly for UI displays, exports, and PDF printouts.
Pounds to Stones Formula
Exact relationship
Use either form:
st = lb ÷ 14
// equivalently (two-step)
st = (lb × 0.45359237) ÷ 6.35029318Example:
180 lb ÷ 14 = 12.85714 stRelated Weight Converters
What is a Pound?
The international avoirdupois pound is defined exactly as 0.45359237 kilograms. It is common in US consumer contexts and appears on body scales, gym equipment, and food labels. When your data flows into clinical, academic, or international systems, converting pounds to kilograms or stones prevents confusion and supports consistent reporting.
What is a Stone?
The modern stone is standardized at 14 lb. While its historical use varied by region and commodity, personal weight and sports contexts in the UK/IE exclusively use this fixed value today. This converter follows that standard so your outputs match contemporary practice.
Step-by-Step: Converting lb to st
- Read the mass in pounds (lb) from your scale or data file.
- Divide by 14 to get stones (st).
- Round the display value per your policy (e.g., 1 decimal place for consumer UI).
Example walkthrough:
Input: 153 lb
Compute: 153 ÷ 14 = 10.92857
Output: 10.9 st (UI, rounded), retain full precision internallyCommon Conversions
Everyday quick checks
| lb | st |
|---|---|
| 98 | 7.00000 |
| 112 | 8.00000 |
| 126 | 9.00000 |
| 140 | 10.00000 |
| 154 | 11.00000 |
| 168 | 12.00000 |
| 182 | 13.00000 |
| 196 | 14.00000 |
Precision, Rounding & Significant Figures
Operational rounding
Consumer-facing screens typically display one decimal place in stones; some clinics use 0.1 kg as the target precision when showing SI values. Whatever you choose, round only once at presentation time and keep the internal value precise to avoid rounding accumulation.
Consistent documentation
Standardize column names (e.g., weight_lb, weight_st, weight_kg), convert at a single step in the pipeline, and document your constants: “1 st = 14 lb; 1 lb = 0.45359237 kg.” This makes exports, analytics, and audits straightforward.
Where This Converter Is Used
- 🏥 Clinics & EHR: Patient intake may record pounds; SI records rely on kilograms, with stones shown for patient comprehension.
- 🏋️ Fitness apps: US users enter pounds; UK/IE users prefer stones and pounds. Keep kg canonical, render stones for UI.
- 🎽 Sports & weigh-ins: Local broadcasts show stones and pounds; officials track kg for classes and records.
- 🛍️ Retail & apparel: Size charts or equipment specs localized to user preference without altering canonical data.
- 📈 Analytics: Aggregations and ML pipelines standardize on kilograms, with stones/pounds derived at read time.
Quick Reference Table
| st | lb |
|---|---|
| 8 | 112 |
| 9 | 126 |
| 10 | 140 |
| 11 | 154 |
| 12 | 168 |
| 13 | 182 |
| 14 | 196 |
Frequently Asked Questions
What is the exact formula to convert pounds to stones?
Use the standardized relationship 1 stone = 14 pounds. Divide pounds by 14 to get stones: st = lb ÷ 14. This constant is exact in modern usage and aligns with the international avoirdupois pound, so your results are interoperable with medical, research, and fitness systems.
How do I handle stones and pounds together (e.g., 11 st 8 lb)?
If you already have stones and additional pounds, convert the pounds portion to a fraction of a stone and add it: st_total = st + (lb ÷ 14). Example: 11 st 8 lb → 11 + 8/14 = 11.5714 st. For the reverse direction (from total stones to stones+lb), multiply the fractional part by 14 to get leftover pounds.
Why do some users prefer stones instead of kilograms or pounds?
In the UK and Ireland, stones remain culturally familiar for personal weight, sports commentary, and broadcast media. Healthcare and science are SI-first (kilograms), but consumer apps often show stones and pounds for readability. Converting from pounds to stones lets you present an intuitive local format without losing precision.
What precision should I display for public interfaces?
One decimal place in stones is common for consumer apps (e.g., 11.6 st). For medical or performance tracking, keep higher-precision internal values and round once at display time to avoid cumulative rounding drift. Always document your rounding policy in release notes or methodology pages.
Is converting via kilograms necessary (lb → kg → st)?
No. A direct conversion is cleaner and avoids extra rounding: st = lb ÷ 14. If you need kilograms too, compute kg = lb × 0.45359237 in parallel and show both for mixed audiences. Internally, it’s best to keep kilograms as canonical for analytics and export.
Are historical stones different from the modern stone unit?
Historically, regional ‘stones’ varied by commodity. Those values are obsolete for personal weight. Modern practice fixes the stone at exactly 14 lb. This converter uses the standardized definition so results align with current clinical and fitness contexts.
How should I store data if users enter pounds but want stones in the UI?
Store SI mass (kilograms) as the canonical value, because kg is universal and avoids unit drift. When users enter pounds, convert lb → kg for storage and compute stones on-the-fly for display. This keeps exports, research use, and long-term analytics consistent.
Can I show both stones and pounds next to kilograms?
Yes—and it’s often the best UX for UK/IE audiences. Present the primary SI value (kg) and a secondary ‘≈ st lb’ display. For mobile, offer a toggle between kilograms and stones/pounds while keeping your underlying canonical value in kilograms for reliability.
Is this converter suitable for weight-class sports and weigh-ins?
Absolutely. Events often announce results in stones and pounds for local audiences, while officials record kilograms. Keep the official record in kilograms and publish stones/pounds for public-facing summaries. That way your audit trail stays reproducible.
Tips for Working with Pounds & Stones
- Keep kilograms canonical for analytics and interchange; compute stones or pounds for display only.
- Publish your rounding policy (e.g., “rounded to 1 decimal place in stones”) to keep PDFs and emails consistent.
- When importing legacy CSVs with mixed units, normalize to kg first, then add stones/pounds for UI readability.