Quick Calc — Length
mm
—
cm
—
m
—
km
—
inch
—
foot
—
yard
—
mile
—
📋 Board Exam Tip
Memorize these: 1 in = 2.54 cm, 1 ft = 12 in = 0.3048 m, 1 mile = 5280 ft = 1.609 km.
PRC loves unit conversions in word problems!
Reference Table — Length
| From | To | |
|---|---|---|
| 1 inch | = | 2.54 cm = 25.4 mm = 0.0254 m |
| 1 foot | = | 12 in = 30.48 cm = 0.3048 m |
| 1 yard | = | 3 ft = 0.9144 m = 91.44 cm |
| 1 mile | = | 5280 ft = 1.609344 km = 1609.34 m |
| 1 meter | = | 3.28084 ft = 39.3701 in = 100 cm |
| 1 kilometer | = | 0.62137 mi = 3280.84 ft = 1000 m |
| 1 centimeter | = | 0.3937 in = 10 mm |
🇵🇭 Pinoy unit: 1 cavan = 50 kg (used for rice/grain in the Philippines). Commonly tested in Agri-Eng exams!
Quick Calc — Weight / Mass
gram
—
kilogram
—
metric ton
—
ounce
—
pound (lb)
—
cavan 🇵🇭
—
📋 Board Exam Tip
Key values: 1 kg = 2.20462 lbs, 1 lb = 16 oz = 453.592 g, 1 metric ton = 1000 kg.
Reference Table — Weight
| From | To | |
|---|---|---|
| 1 kg | = | 2.20462 lbs = 35.274 oz = 1000 g |
| 1 pound (lb) | = | 0.453592 kg = 16 oz = 453.592 g |
| 1 ounce (oz) | = | 28.3495 g = 0.0625 lb |
| 1 metric ton | = | 1000 kg = 2204.62 lbs |
| 1 cavan 🇵🇭 | = | 50 kg = 110.23 lbs |
Quick Calc — Temperature
Celsius
—°C
Fahrenheit
—°F
Kelvin
—K
Formulas
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
°C = K − 273.15
📋 Board Exam Tip
Absolute zero = 0 K = −273.15 °C. Water freezes at 0 °C = 32 °F = 273.15 K.
Human body temp = 37 °C = 98.6 °F = 310.15 K. °R (Rankine) = °F + 459.67 (rare but appears in thermo!).
Reference Points
| Description | °C | °F | K |
|---|---|---|---|
| Absolute zero | −273.15 | −459.67 | 0 |
| Water freezes | 0 | 32 | 273.15 |
| Room temp | 25 | 77 | 298.15 |
| Body temp | 37 | 98.6 | 310.15 |
| Water boils (1 atm) | 100 | 212 | 373.15 |
🇵🇭 Pinoy reference: 1 drum (55-gal drum) = 55 US gal ≈ 208 L. Commonly used in industrial PH settings!
Quick Calc — Volume
mL
—
Liter (L)
—
m³
—
ft³
—
US Gallon
—
UK Gallon
—
US Cup
—
Drum 🇵🇭
—
📋 Board Exam Tip
Key: 1 L = 1000 mL = 0.001 m³, 1 US gal = 3.78541 L, 1 UK gal = 4.54609 L,
1 ft³ = 28.3168 L. Watch for US vs UK gallon in problems!
Reference Table — Volume
| From | To | |
|---|---|---|
| 1 liter | = | 1000 mL = 0.001 m³ = 0.264172 US gal |
| 1 US gallon | = | 3.78541 L = 3785.41 mL = 0.133681 ft³ |
| 1 UK gallon | = | 4.54609 L = 1.20095 US gal |
| 1 ft³ | = | 28.3168 L = 7.48052 US gal |
| 1 m³ | = | 1000 L = 264.172 US gal = 35.3147 ft³ |
| 1 drum 🇵🇭 | = | 55 US gal = 208.197 L |
Quick Calc — Power
Watt (W)
—
Kilowatt (kW)
—
HP Mechanical
—
HP Metric
—
BTU/hr
—
📋 Board Exam Tip
1 HP (mechanical) = 746 W = 0.746 kW. HP metric = 735.499 W. Most EE board exams use mechanical HP.
1 kW = 3412.14 BTU/hr. Refrigeration: 1 ton = 12,000 BTU/hr = 3.517 kW.
Reference Table — Power
| From | To | |
|---|---|---|
| 1 HP (mech) | = | 746 W = 0.746 kW = 2544.43 BTU/hr |
| 1 HP (metric) | = | 735.499 W = 0.7355 kW |
| 1 kW | = | 1000 W = 1.34102 HP (mech) = 3412.14 BTU/hr |
| 1 BTU/hr | = | 0.29307 W = 0.000393 HP |
| 1 ton refrig. | = | 12,000 BTU/hr = 3.517 kW |
Quick Calc — Area
m²
—
ft²
—
in²
—
km²
—
hectare
—
acre
—
Quick Calc — Pressure
Pa
—
kPa
—
MPa
—
bar
—
atm
—
PSI
—
mmHg
—
🇵🇭 Pinoy reminders: 1 cavan rice ≈ 50 kg | 1 drum = 55 US gal = 208 L | Standard atmosphere = 101.325 kPa = 14.696 PSI
📋 Board Exam Tip
1 atm = 101.325 kPa = 14.696 PSI = 1.01325 bar = 760 mmHg. Gage vs Absolute: P_abs = P_gage + P_atm.
Area: 1 hectare = 10,000 m² = 2.47105 acres.
Reference Table — Area & Pressure
| From | To | |
|---|---|---|
| AREA | ||
| 1 m² | = | 10.7639 ft² = 1550 in² |
| 1 ft² | = | 0.092903 m² = 144 in² |
| 1 hectare | = | 10,000 m² = 2.47105 acres |
| 1 acre | = | 4046.86 m² = 43,560 ft² |
| 1 km² | = | 100 ha = 247.105 acres |
| PRESSURE | ||
| 1 atm | = | 101.325 kPa = 14.696 PSI = 760 mmHg = 1.01325 bar |
| 1 bar | = | 100 kPa = 14.5038 PSI = 0.9869 atm |
| 1 PSI | = | 6.89476 kPa = 0.068046 atm |
| 1 kPa | = | 0.145038 PSI = 0.009869 atm = 0.01 bar |
More PinasTools
All Unit Categories Here
| Tab | Units Covered |
|---|---|
| 📏 Length | mm, cm, m, km, in, ft, yd, mi |
| ⚖️ Weight | g, kg, ton, oz, lb, cavan (PH) |
| 🌡️ Temperature | °C, °F, K |
| 💧 Volume | mL, L, m³, ft³, US gal, UK gal, cup, drum |
| ⚡ Power | W, kW, HP (mech), HP (metric), BTU/hr |
| 📐 Area | m², ft², in², km², hectare, acre |
| 📐 Pressure | Pa, kPa, MPa, bar, atm, PSI, mmHg |