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Power calculator (physics)

Compute power from work done over a period of time (P = W / t).

Related tools

All Physics tools →
Work and Power CalculatorCompute work (W = F·d·cosθ) and power (P = W/t) with full unit conversions.Work done calculatorCompute the work done by a force over a distance (W = F·d).Power dissipation calculatorCompute the power dissipated by a resistor from current and resistance (P = I²R).Acceleration calculatorCompute acceleration from the change in velocity over time.Displacement calculatorCompute displacement from initial velocity, acceleration and time (s = ut + ½at²).Free fall calculatorCompute the fall time and impact velocity of an object dropped from a height.Impulse calculatorCompute impulse from a force applied over a time (J = F·t).Light travel time calculatorFind how long light takes to travel a distance in space.

Need Power (W)? The Power calculator (physics) derives it from Work (J), Time (s) in one step. For instance, with Work (J) = 1,000 and Time (s) = 5 it returns Power (W) = 200.

How to use it

  1. Enter your values: Work (J), Time (s).
  2. Read the result instantly: Power (W).

Frequently asked questions

How does the Power calculator (physics) work?

It takes Work (J) and Time (s) and derives Power (W) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Work (J) and Time (s). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Work (J) = 1,000 and Time (s) = 5, the calculator returns Power (W) = 200. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Checking a homework answer, sizing something before building it, and getting an order of magnitude before committing to a design — a torque on a bolt, the force a spring returns, the frequency a circuit resonates at, how long light takes to arrive.

What is the most common mistake?

Feeding in a value in the wrong unit. Physics formulas assume SI throughout, so grams instead of kilograms or centimetres instead of metres shifts the answer by powers of ten without any warning.

What is the difference between the Power calculator (physics) and the Work and Power Calculator?

This one returns Power (W); the Work and Power Calculator returns Result. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Work done calculator is the closest one after this: Compute the work done by a force over a distance (W = F·d).

Where do the figures come from, and how current are they?

Constants are the CODATA values and the formulas are the textbook ones. Most assume an idealised case — no air resistance, no friction, a point mass — and the tool says so where the simplification matters.

Further reading

All guides →
GuideThe Four Kinematics Equations: Which One to Use, and What Each One Leaves OutFive variables, four equations, and each equation is missing exactly one of them. Choose by looking at the variable the question never mentions.ExplainerProjectile Motion Explained: Range, Height, Flight Time — and Why 45° Is Not Always BestThree formulas cover the whole of projectile motion on level ground. The catch is level ground: the moment launch and landing heights differ, the 45° result stops being true.ExplainerHow the Doppler Effect Works: The Formula, the Sign Convention, and Why Moving the Source Is Not the Same as Moving the ListenerFor sound, f' = f(v + v_o)/(v − v_s) — and getting the signs backwards is the classic error. Here is the convention spelled out, a 440 Hz source computed at four speeds, and why light needs a different equation entirely.ExplainerWhat Is the Reynolds Number? The Formula, the Units That Cancel, and Why 2 300 Is Only for PipesRe = ρvL/μ compares inertia with viscosity, and the units really do cancel. See the number worked out for honey, a household pipe, an artery, a swimmer and a wing — and why the 2 300 threshold belongs to pipe flow alone.ExplainerHooke's Law Explained: F = kx, Real Spring Constants, and Where It Stops HoldingHooke's law says force is proportional to stretch — but only below the elastic limit. Here is F = kx with worked numbers, what a 200 N/m spring actually feels like, and how springs combine.ExplainerHow Buoyancy Works: Archimedes' Principle, and Why Ice Floats With 10.5 % Above WaterThe upward force equals the weight of the fluid pushed aside. That one sentence decides whether something floats, and if it floats, exactly how much of it stays under.
Power calculator (physics) — OneKitly