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🏗️ Engineering & constructionFree
Straight fin efficiency calculator
A straight fin with a fin parameter of 10 per metre and a length of 0.05 m reaches an efficiency of about 0.924, because their product is 0.5.
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🏗️ Engineering & constructionFree
Fixed-fixed beam center load calculator
A 6 m beam fixed at both ends, loaded with 10000 N at midspan, carries 7500 N·m at each support and at the centre, with opposite signs.
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🏗️ Engineering & constructionFree
Flow regime from Reynolds number calculator
A Reynolds number of 3200 falls in the transitional band, between laminar below 2300 and turbulent above 4000.
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🏗️ Engineering & constructionFree
Hydrostatic Force on an Inclined Surface Calculator
A 2.4 m² plate with its centroid 3.5 m below the water surface takes 82.37586 kN of hydrostatic force.
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🏗️ Engineering & constructionFree
Fourier Number Calculator
With a thermal diffusivity of 0.0000117 m²/s, 600 seconds and a characteristic length of 0.05 m, the Fourier number is 2.808.
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🏗️ Engineering & constructionFree
Swamee-Jain friction factor calculator for turbulent pipe flow
Turbulent flow at a Reynolds number of 100000 in a pipe with relative roughness 0.0002 has a Darcy friction factor of 0.018994752725 by the explicit Swamee-Jain…
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🏗️ Engineering & constructionFree
Gear output speed calculator
A shaft turning at 1000 rpm through a gear ratio of 2 drives the output at 500 rpm, a reduction stage.
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🏗️ Engineering & constructionFree
Gear pitch diameter calculator
A spur gear with a module of 2.5 mm and 24 teeth has a pitch diameter of 60 mm. Enter module and tooth count to lay out gear pairs and shaft spacing before the…
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🏗️ Engineering & constructionFree
Pipe pressure drop from head loss calculator
A head loss of 12.5 m of water at 998.2 kg/m³ equals a pressure drop of about 1.2 bar. Enter head loss, density and gravity to get the drop in pascals…
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🏗️ Engineering & constructionFree
Horizontal Curve Calculator
Give a 500 m radius and a 60-degree deflection and you get the tangent length, the arc length and the external distance of the curve, all in metres.
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🏗️ Engineering & constructionFree
Height of instrument calculator
With a benchmark at 100 m and a backsight of 1.245 m, the height of instrument is 101.245 m. Enter the benchmark elevation and the backsight reading to start a…
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🏗️ Engineering & constructionFree
Map scale from measurement calculator
Turn a ruler measurement into a map scale: 2 cm on the map that span 1 km on the ground give 1:50000.
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🏗️ Engineering & constructionFree
Modulus of toughness estimate
Estimate how much energy a material absorbs before it breaks: 250 MPa yield, 450 MPa ultimate and a fracture strain of 0.3 give 105 MJ/m³.
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🏗️ Engineering & constructionFree
Nozzle exit velocity calculator
Estimate how fast liquid leaves a tank opening: with 5 m of head, Torricelli's rule gives about 9.90 m/s.
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🏗️ Engineering & constructionFree
Heat exchanger NTU effectiveness calculator
Find how close a heat exchanger gets to the maximum possible heat transfer: NTU 2 with a capacity ratio of 0.5 in counterflow gives an effectiveness of just…
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🏗️ Engineering & constructionFree
Percent Elongation Calculator for Tensile Specimens
Measure how far a specimen stretched before breaking: a gauge length that grows from 50 mm to 62.5 mm has lengthened 12.5 mm, an elongation of 25 %.
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🏗️ Engineering & constructionFree
Pipe flow velocity calculator
Find how fast fluid moves on average in a full round pipe: 0.01 m³/s through a 0.1 m bore travels at just over one and a quarter metres per second.
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🏗️ Engineering & constructionFree
Plastic Moment Capacity Calculator
Get the full plastic bending capacity of a section: a plastic modulus of 500000 mm³ with a yield strength of 355 MPa gives 177.5 kN·m.
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🏗️ Engineering & constructionFree
Solid Shaft Polar Moment of Inertia Calculator
Get the polar moment of inertia of a solid round shaft from its diameter alone: a 50 mm shaft has a J of just over six hundred thousand mm⁴.
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🏗️ Engineering & constructionFree
Pump Total Dynamic Head Calculator
Add up what a pump must overcome: 18 m of lift, 7.5 m of friction loss and an outlet speed of 2.4 m/s come to just under twenty-six metres of total head.
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🏗️ Engineering & constructionFree
Thermal resistance series calculator
Stack up the thermal resistance of a layered wall: 0.08 m of mineral wool at 0.04 W/(m·K) alone adds 2 m²·K/W, far more than the brick and gypsum board around…
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🏗️ Engineering & constructionFree
Screw jack MA calculator
See how much a screw jack multiplies your effort: a 0.5 m handle on a 0.005 m pitch gives an ideal advantage of 2π times 100, so each newton of effort lifts…
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🏗️ Engineering & constructionFree
Shaft critical speed calculator from static deflection
Estimate where a rotating shaft starts to whirl: 2.5 mm of static deflection puts the first critical speed just under six hundred rpm.
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🏗️ Engineering & constructionFree
Slider-Crank Piston Position Calculator
Locate a piston at any crank angle: with a 50 crank radius and a 150 rod, top dead centre sits at 200 and the stroke is 100, and at 60° the piston has dropped…
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🏗️ Engineering & constructionFree
Soderberg fatigue criterion calculator
Check whether a cyclic load stays inside the Soderberg line: 120 alternating and 80 mean against a 300 endurance limit and 500 yield give a utilization of 0.56…
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🏗️ Engineering & constructionFree
Steel plate weight calculator
Weigh a plate before you order it: a 2 m by 1 m sheet, 0.01 m thick, in mild steel at 7850 kg/m³ has a volume of 0.02 m³ and weighs 157 kg.
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🏗️ Engineering & constructionFree
Motor Synchronous Speed Calculator
Find how fast the magnetic field turns in an AC motor: four poles at 50 Hz give 1500 rpm, one revolution every 40 ms.
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🏗️ Engineering & constructionFree
Thermal strain calculator
See how much a material grows when heated: at 12 ppm/K, warming from 20 °C to 70 °C gives a strain of 0.0006, or 600 microstrain, so each unrestrained metre…
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🏗️ Engineering & constructionFree
Torque from power and speed calculator
Turn a machine's power and speed into shaft torque: 15 kW at 1450 rpm puts just under a hundred newton-metres on the shaft.
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🏗️ Engineering & constructionFree
Shaft Torsional Shear Stress Calculator
Check how hard a torque loads a round shaft: 1200 N·m on a solid shaft of 25 mm radius produces just under forty-nine megapascals of shear at its surface.
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🏗️ Engineering & constructionFree
Transformer turns ratio and voltage calculator
Find what voltage a winding delivers: 230 V on a 1000-turn primary with a 100-turn secondary gives a turns ratio of 10 and an ideal 23 V output, so it is a…
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🏗️ Engineering & constructionFree
Trapezoidal channel hydraulic radius
A channel 10 wide at the bed, 2 deep and with 1.5:1 banks has a flow area of 26 and a hydraulic radius of about 1.510653, in the same length units you typed.
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🏗️ Engineering & constructionFree
Trigonometric leveling calculator
With the instrument 1.55 above the ground, a 5.5° vertical angle, 120 of horizontal distance and a target 1.8 high, the ground-to-ground difference is about…
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🏗️ Engineering & constructionFree
Truss joint two-member force calculator
With one bar along the x-axis, one pointing straight up and a downward load of 100 on the joint, the vertical bar carries 100 in tension and the horizontal one…
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🏗️ Engineering & constructionFree
Hydraulic turbine power calculator
With 2.5 m³/s of flow, 40 m of net head, 88% efficiency and fresh water, a turbine delivers about 863 kW out of 980665 W of hydraulic power.
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🏗️ Engineering & constructionFree
Feeder voltage drop percentage calculator
A drop of 7.2 V on a 240 V feeder is 3%: enter the voltage loss you already calculated and the nominal system voltage, and get the percentage your design review…
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🏗️ Engineering & constructionFree
Vertical curve elevation calculator
On a curve 200 long that starts at elevation 100 and goes from a 2% climb to a 1% fall, the point 75 from the start sits at 101.078125, with a grade of 0.875%.
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🏗️ Engineering & constructionFree
Feeder voltage regulation calculator
A feeder that reads 240 V at no load and 230 V at full load has a voltage regulation of about 4.3478%, from a 10 V change.
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🏗️ Engineering & constructionFree
Interior Wall Surface Temperature Calculator
With 21 °C indoors, a wall U-value of 0.35, an inside film coefficient of 7.7 and a 25 K difference to outside, the inner wall face sits at 19.863636 °C.
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🏗️ Engineering & constructionFree
V-notch weir flow calculator
A 90° V-notch with 0.25 m of head above the vertex passes 45.098832115 litres per second with the standard coefficient of 0.611, and you can enter the…
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🏗️ Engineering & constructionFree
Wheel and axle mechanical advantage calculator
A wheel with a radius of 30 on an axle with a radius of 5 multiplies your effort by 6, in any length unit as long as both match.
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💰 Finance & moneyFree
Reverse percentage calculator
If a final amount of 120 includes a 20% increase, the original was 100, found by dividing by 1.20 rather than taking 20% off.
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❤️ Health & fitnessFree
Running age-grade calculator
See how strong a race time is for your age: a 52-year-old woman who runs 10 km in 48:30 scores 74.16%, which counts as regional class.
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❤️ Health & fitnessFree
Female Widmark BAC calculator
Estimate a woman's blood alcohol level with the Widmark formula: 3 standard drinks at 65 kg after 2 hours give about 0.0875%.
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❤️ Health & fitnessFree
Calories per serving calculator
Divide the calories of a whole recipe by the servings it makes: 1800 calories over six servings is 300 per serving.
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❤️ Health & fitnessFree
Carb cycling planner
Share out a weekly carb budget across high, medium and low days: 1400 g with three high, two medium and two low days gives 280 g, 186.7 g and 93.3 g, and the…
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❤️ Health & fitnessFree
Critical power two-point calculator
Two maximal efforts are enough: 300 seconds at 350 W and 1200 seconds at 300 W give a critical power of about 283.33 W and a W′ of 20 kJ.
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❤️ Health & fitnessFree
DOTS score calculator for powerlifting totals
A man totalling 500 kg at 75 kg of body weight scores 358.711 DOTS. Enter the squat, bench and deadlift total, body weight and sex category to compare lifters…
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❤️ Health & fitnessFree
Fractional excretion of sodium calculator
Works out what share of filtered sodium ends up in the urine: plasma sodium 140, urine sodium 40, plasma creatinine 2 and urine creatinine 100 give a FENa of…
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❤️ Health & fitnessFree
Grade-adjusted pace calculator
Converts a hilly running pace into its flat-ground equivalent: a five-minute kilometre on a 5% climb is worth about 3:51 per km on the flat.
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❤️ Health & fitnessFree
Heart Rate Recovery Ratio Calculator
Divides your peak exercise heart rate by a later recovery reading: 180 bpm at the peak and 120 bpm afterwards give a ratio of 1.5.
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❤️ Health & fitnessFree
Heart rate reserve calculator
Subtracts resting heart rate from maximum to give the range you train within: a maximum of 190 bpm and a resting rate of 60 bpm leave a reserve of 130 bpm.
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❤️ Health & fitnessFree
Robergs-Landwehr maximum heart rate calculator
Applies the Robergs-Landwehr equation, 205.8 minus 0.685 times age, to give an age-based maximum pulse: a 40-year-old gets 178.4 bpm.
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❤️ Health & fitnessFree
Intermittent fasting window calculator
Turns your first meal and a fasting ratio into clock times: start eating at 12:00 on a 16:8 schedule and your window runs 12:00–20:00, with the fast lasting…
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❤️ Health & fitnessFree
Lactate threshold heart rate estimate
With a maximum heart rate of 190 bpm, the classic 85% rule puts your lactate threshold at 161.5 bpm.
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❤️ Health & fitnessFree
Macro Split from Calories Calculator
2000 kcal split 30:40:30 gives 150 g of protein, 200 g of carbohydrate and 66.67 g of fat. Enter your calorie target and any three-part ratio, and get the grams…
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❤️ Health & fitnessFree
Omega-6 to omega-3 ratio calculator
12 g of omega-6 and 2 g of omega-3 in a day make a ratio of 6:1, in the elevated band. Enter your two daily gram totals to get the ratio and a screening label…
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❤️ Health & fitnessFree
Lombardi one rep max calculator for weight and repetitions
100 kg lifted for 5 reps gives a Lombardi one-rep max of 117.46 kg. Enter the weight and the reps you completed, and get your estimated single-lift maximum in…
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❤️ Health & fitnessFree
Mayhew One-Rep Max Calculator from Weight and Repetitions
100 kg lifted for 5 reps gives a Mayhew one-rep max of 119.01 kg. Enter the weight and reps of a genuine working set and the exponential Mayhew equation returns…
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❤️ Health & fitnessFree
Percent VO2max from heart rate calculator
Training at 60% of your heart rate reserve corresponds to about 75.4% of VO2max. Enter your percent of heart rate reserve and get the matching share of maximal…
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