Mortgage CalculatorLoan CalculatorAuto Loan CalculatorCompound Interest CalculatorSimple Interest CalculatorSavings CalculatorRetirement CalculatorROI CalculatorCAGR CalculatorPresent Value CalculatorFuture Value CalculatorAnnuity CalculatorAPR CalculatorCredit Card Payoff CalculatorDebt-to-Income Ratio CalculatorIncome Tax Calculator (US Federal)Salary to Hourly Wage CalculatorTip CalculatorDiscount CalculatorSales Tax CalculatorProfit Margin CalculatorMarkup CalculatorBreak-Even CalculatorInflation CalculatorSavings Goal CalculatorExchange Rate CalculatorPercentage CalculatorPercentage Change CalculatorFraction CalculatorAverage CalculatorMean, Median & Mode CalculatorStandard Deviation CalculatorRatio CalculatorProportion CalculatorExponent CalculatorLogarithm CalculatorSquare Root CalculatorFactorial CalculatorGCD & LCM CalculatorPythagorean Theorem CalculatorQuadratic Equation CalculatorSlope CalculatorArea CalculatorPerimeter CalculatorVolume CalculatorCircle CalculatorTriangle CalculatorRandom Number Range AnalyzerScientific Notation CalculatorRounding CalculatorBMI CalculatorBMR CalculatorTDEE CalculatorCalorie CalculatorBody Fat CalculatorIdeal Weight CalculatorMacro CalculatorProtein CalculatorWater Intake CalculatorOvulation CalculatorPregnancy Due Date CalculatorConception CalculatorPeriod CalculatorPace CalculatorHeart Rate Zones CalculatorVO2 Max CalculatorOne Rep Max CalculatorSleep CalculatorBlood Alcohol Calculator (BAC)Lean Body Mass CalculatorCalories Burned CalculatorPregnancy Weight Gain CalculatorAge CalculatorDate Duration CalculatorDays Between Dates CalculatorAdd Days to Date CalculatorBusiness Days CalculatorWork Hours CalculatorTime Duration CalculatorTime Zone ConverterWeek Number CalculatorDay of Week CalculatorLeap Year CalculatorUnix Timestamp ConverterTime Add / Subtract CalculatorDays Until CalculatorZodiac Sign CalculatorChinese Zodiac CalculatorRetirement Date CalculatorQuarter CalculatorLength ConverterWeight ConverterTemperature ConverterVolume ConverterArea ConverterSpeed ConverterTime ConverterData Storage ConverterPressure ConverterEnergy ConverterPower ConverterForce ConverterTorque ConverterAngle ConverterFuel Consumption ConverterCooking ConverterShoe Size ConverterDensity ConverterFrequency ConverterHeight ConverterFlow Rate ConverterNumber to Words ConverterRoman Numeral ConverterBeaufort Scale ConverterScreen Size CalculatorDecibel ConverterConcrete CalculatorTile CalculatorPaint CalculatorFlooring CalculatorDrywall CalculatorBrick CalculatorGravel CalculatorMulch CalculatorDeck CalculatorFence CalculatorRoof Pitch CalculatorRoofing Material CalculatorStairs CalculatorSquare Footage CalculatorCubic Yard CalculatorBoard Feet CalculatorInsulation CalculatorWallpaper CalculatorOhm's Law CalculatorParallel Resistor CalculatorVelocity CalculatorAcceleration CalculatorKinetic Energy CalculatorPotential Energy CalculatorForce CalculatorMomentum CalculatorFriction CalculatorProjectile Range CalculatorPendulum CalculatorWavelength CalculatorpH CalculatorMolarity CalculatorDilution CalculatorIdeal Gas CalculatorBoyle's Law CalculatorHalf-Life CalculatorGPA CalculatorGrade CalculatorFinal Grade CalculatorWeighted Grade CalculatorDog Age CalculatorCat Age CalculatorElectricity Cost CalculatorFuel Cost CalculatorSplit Bill CalculatorUnit Price CalculatorReading Time CalculatorSubnet CalculatorDownload Time CalculatorProbability CalculatorRent Affordability CalculatorSolar Payback CalculatorHousehold Budget CalculatorEmergency Fund Calculator

Force Calculator

Newton's second law: F = m × a, with weight on Earth as a bonus.

By CalcHub Editorial · Last reviewed

Quick answer

  • Formula: F = m × a; Weight = m × g, g = 9.80665 m/s²
  • Worked example — Force: 20.0000 N (full example below).

Force Calculator

Set this to 9.80665 to reproduce the weight on Earth shown alongside.
Worked example result
Force20.0000 N
Weight on Earth (m × g)98.0665 N

Accelerating 10 kg at 2 m/s² requires a net force of 20 N. The same mass weighs 98.07 N on Earth.

Diagram: how the Force Calculator works — you enter Mass, Acceleration; it applies the formula F = m × a; Weight = m × g, g = 9.80665 m/s²; and the worked example gives Force: 20.0000 N.
How the Force Calculator works — the inputs, the formula, and a worked example (Force: 20.0000 N).

Newton's second law states that the net force on an object equals its mass times its acceleration. It is the foundation of classical mechanics and the definition of the newton.

Enter mass and acceleration to get force in newtons. The calculator also shows the object's weight on Earth — the force when the acceleration is gravity, g = 9.80665 m/s².

The formula

F = m × a; Weight = m × g, g = 9.80665 m/s²

Worked example

Accelerating 10 kg at 2 m/s² requires a net force of 20 N. The same mass weighs 98.07 N on Earth.

Worked example for the Force Calculator: with Mass 10, Acceleration 2, the result is Force: 20.0000 N; Weight on Earth (m × g): 98.0665 N.
The worked example, with the example values entered and the results they give.

The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.

Frequently asked questions

What is the difference between mass and weight?

Mass (kg) is the amount of matter and is the same everywhere. Weight (N) is the gravitational force on that mass — about 9.81 N per kilogram on Earth, but only about 1.62 N per kilogram on the Moon.

What is one newton?

The force needed to accelerate 1 kg by 1 m/s². Roughly, it is the weight of a small apple (about 102 g) on Earth.

Category: Science calculators

Sources & methodology

This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.

Content last reviewed by CalcHub Editorial.

Embed this calculator on your site

Free to use with attribution — paste the snippet below and the calculator appears on your page, with a link back to CalcHub.

<iframe src="https://calc-hub-63e.pages.dev/embed/force-calculator" width="100%" height="640" style="border:1px solid #d9e2ea;border-radius:12px" loading="lazy" title="Force Calculator — CalcHub"></iframe>

Open the embed version →

Acceleration Calculator — how-it-works diagram

Acceleration Calculator

Acceleration from a change in velocity, plus the distance covered.

Science →
Friction Calculator — how-it-works diagram

Friction Calculator

Friction force from the coefficient of friction and the object's weight.

Science →
Momentum Calculator — how-it-works diagram

Momentum Calculator

Linear momentum p = mv, with kinetic energy shown alongside.

Science →
Force Converter — how-it-works diagram

Force Converter

Convert newtons, kilonewtons, dynes, kilogram-force and pound-force.

Unit Conversions →