Unit Converter & Calculator

Fast, accurate and free tool for unit conversion and scientific calculations

Start Converting 🔢 Calculator

🌴 Budget Travel Bali

Bali on $35/day

🏨 $8/night🍜 $1.50 meal🛵 $5/day

Ad Space

Conversion Categories

Choose a category and start converting

Length

8 units

Weight

6 units

Temperature

3 units

Area

6 units

Volume

6 units

Speed

4 units

Time

7 units

Data

5 units

Cooking

8 units

Pace

5 units

Energy

8 units

Power

6 units

Historical Units

9 units

Historical Mass

6 units

Historical Area

5 units

Popular Conversions

Most searched conversion pages

Cups to Grams Converter

Convert cups to grams (ml-equivalent) for baking and cooking. Quick reference table for flour, sugar, butter and more.

Tablespoons to Milliliters Converter (tbsp to ml)

Convert tablespoons (tbsp) to milliliters (ml) instantly. Includes US tablespoon = 14.7868 ml conversion table.

Teaspoons to Milliliters Converter (tsp to ml)

Convert teaspoons to milliliters (1 tsp = 4.92892 ml). Perfect for recipes and medication doses.

Cups to Milliliters Converter (cup to ml)

1 US cup = 236.588 ml. Convert between cups and milliliters with our quick reference table.

Min/km to Km/h Converter

Convert your running pace from minutes per kilometer to kilometers per hour. Plan races and training instantly.

Min/Mile to Km/h Converter

Convert minutes per mile to kilometers per hour for runners. Quick pace calculator with reference table.

Min/km to Min/Mile Pace Converter

Convert running pace between min/km and min/mile. Essential tool for runners training across metric and imperial units.

Calories to Joules Converter (cal to J)

1 calorie = 4.184 joules. Convert between calories and joules for nutrition, physics and chemistry calculations.

Kcal to Kj Converter

Convert kilocalories (kcal) to kilojoules (kJ) for food labels and nutrition. 1 kcal = 4.184 kJ.

kW to HP Converter

Convert kilowatts (kW) to mechanical horsepower (HP). 1 kW ≈ 1.341 HP. Used for car engines and motors.

HP to kW Converter

Convert horsepower (HP) to kilowatts (kW). 1 HP ≈ 0.7457 kW. Standard for engine power conversions.

Pood to Kg Converter

1 pood ≈ 16.38 kg. Convert the historical Russian mass unit pood to kilograms. Approximate value for historical contexts.

Verst to Kilometers Converter

1 verst ≈ 1.0668 km. Convert the historical Russian length unit verst to kilometers.

Cubit to Centimeters Converter

1 cubit ≈ 45.72 cm. Convert the ancient cubit (forearm length) to centimeters. Approximate historical value.

Desyatina to Hectares Converter

1 desyatina ≈ 1.0925 hectares. Convert historical Russian land area to hectares.

Ad Space

Scientific Calculator

Trigonometric, logarithmic functions and much more

Open Calculator

Why ConvertProf?

Most online converters are either ad-stuffed or wrong by the third decimal. ConvertProf is built by engineers and editors who actually use these tools every day — for cooking, running training, car imports, science homework and historical research. Every conversion factor on the site is taken from the SI brochure, NIST or the 1959 international yard and pound agreement, then verified against published reference tables.

Exact factors

No rounding tricks. 1 inch = 2.54 cm exactly. 1 lb = 0.45359237 kg.

Instant, offline-friendly

All math runs in your browser. No server round-trips, no data leaves your device.

Context, not just numbers

Every category page explains the formula, history and real-world use cases.

15 categories

From everyday units to historical Russian pood, verst and desyatina.

About this project

ConvertProf started as a personal cheat-sheet for converting US baking recipes to a European kitchen scale. It grew into a public tool when we realised most "top of search" converters quietly use rounded factors — fine for casual use, but unacceptable when you are filing customs paperwork, registering a car, or measuring medication doses.

We follow simple editorial rules: every formula is sourced, every category page is reviewed before publication, and any reader-reported error is fixed within 48 business hours. Read more on our About page or browse the long-form articles in our blog.

Found a unit we missed or a result that looks wrong? Email hello@convertprof.com or use the Contact form.