Unit Converter
KM–mile, kg–pound, Celsius–Fahrenheit, litre–gallon and more — instant conversion
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No matches
Quick pairs
Unit Converter — Complete Guide & Instructions
MakeCard Unit Converter handles the five conversion families people actually need daily — length, weight, temperature, volume and area. Pick a category, enter a value, choose From and To units, and the result appears instantly with up to 8 decimals of precision. Quick-pair buttons cover the most searched conversions like km→mile and °C→°F, and temperature uses proper formulas rather than simple ratios. It is built for students, cooks, travellers, traders and anyone dealing with mixed metric-imperial units.
How to Use Unit Converter
- 1 Click a category tab — Length, Weight, Temperature, Volume or Area.
- 2 Type the number in the "Value" field on the left.
- 3 Choose the From and To units in the two dropdowns — the green Result box updates live.
- 4 Press the swap button in the middle to reverse the conversion instantly.
- 5 Or tap a "Quick pairs" chip like "km → mile" or "°C → °F" to jump straight to a common conversion.
Key Features & Capabilities
- Five categories in one tool: length, weight, temperature, volume and area.
- 27 units including km, mile, inch, tonne, quintal, pound, ounce, litre, US/UK gallon, cup, acre, hectare, sq ft and more.
- Proper temperature formulas — correct °C↔°F↔K conversion, not a simple ratio.
- Quick-pair chips for the most common conversions like kg→pound and acre→sq ft.
- One-tap swap button flips From and To units.
- Indian digit grouping and smart precision — up to 8 decimals for small results.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Categories | Length, weight, temperature, volume, area |
| Units | 27 total — metric and imperial/US |
| Temperature | Celsius, Fahrenheit, Kelvin — exact formulas |
| Precision | Up to 8 decimals, en-IN number formatting |
| Quick pairs | Pre-set chips per category for popular pairs |
Practical Everyday Use Cases
- Converting km to miles for road trips abroad and car specifications.
- Checking luggage weight in kg vs pounds for airline limits.
- Converting recipe volumes — cups, ml and litres — while cooking.
- Translating °F oven or weather temperatures into Celsius.
- Comparing property sizes in sq ft, sq m, acres and hectares.
Pro Tips for Best Results
- 1 quintal = 100 kg and 1 tonne = 10 quintals — handy for mandi and commodity rates.
- US and UK gallons differ (3.785 L vs 4.546 L) — pick the right one for fuel and milk.
- For area, remember 1 acre ≈ 43,560 sq ft ≈ 4,047 sq m.
- Kelvin starts at absolute zero — a 10 °C rise equals a 10 K rise, but the scales are offset by 273.15.
Common Problems & Solutions
Small conversions like mm→inch legitimately produce many decimals — the tool rounds to 8 decimals and drops trailing zeros.
Temperature uses real formulas, not multiplication — 100 °C → 212 °F is correct. Ratio-based answers elsewhere are the wrong ones.
The 27 units cover the common set; niche units like furlongs or troy ounces are not included — check the related Land Area converter for property units.
Privacy & Security
100% Client-Side Execution
Every conversion is computed locally in your browser — no values or queries leave your device or get stored.
Frequently Asked Questions
Everything you need to know about using Unit Converter
1 mile = 1.609344 km — roughly 1.6 km. Conversely 1 km ≈ 0.621 miles, so a 10 km run is about 6.2 miles.
Multiply °C by 9/5 and add 32 — e.g. 37 °C = 98.6 °F. Select the Temperature tab and the tool applies the exact formula instantly.
1 quintal = exactly 100 kg, and 1 tonne = 1,000 kg = 10 quintals — common in Indian agriculture and commodity trading.
A US gallon is 3.785 litres while a UK (imperial) gallon is 4.546 litres — about 20% bigger. Both are in the Volume dropdown so pick the correct one.
1 acre = 43,560 sq ft = 4,046.86 sq m ≈ 0.4047 hectare. Use the Area tab to convert between all of these instantly.
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