Litres consumed per 100 kilometres; lower is better. Standard metric efficiency unit.

Energy lost deforming tires as they roll. Low-pressure or wide tires raise it.

Automotive Calculators

Sensor Voltage Calculator

2026-09-27 6 min

Sensor output percent and physical value from reference voltage and signal bounds.

Signal Percent: 64.0 %
Physical Value: 64.0

Calculator

Reference Voltage(V) Help

Usually 5.00 V

Signal Voltage(V)

Physical at 0 V Help

Scale minimum

Physical at Ref V Help

Scale maximum

Results update live as you type

Live statistics

Signal Percent

64.0 %

Physical Value

64.0

Results

Optimal

Signal Percent

64.0%

Physical Value

64.0

Planning estimate from standard automotive formulas. Validate with dyno, timeslip or datalog data when precision matters.

Visualizations

Results overview

64Signal Percent

64Physical Value

Signal Percent vs. Reference Voltage

Signal Percent

64%

0100

Formula

Linear ratiometric scaling: most engine sensors map 0-ref volts to their physical span.

Percent = signal / reference x 100; value = min + % x (max - min)

Alternative Form

Ratiometric sensors cancel reference drift — always divide by measured 5 V

Variables

Symbol	Name	Unit	Description
V	Ratiometric		Output tracks supply

Explanation

TPS, MAP and pedal sensors are potentiometers/bridges: percent of the 5-V rail is the reading — backprobe the reference too.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Record the inputs.

Reference Voltage:5 V

Signal Voltage:3.2 V

Physical at 0 V:0

Physical at Ref V:100

Result: 4 inputs ready

Step 2

Apply the formula.

Percent = signal / reference x 100; value = min + % x (max - min)

Result: Primary result = 64.0 %

Step 3

Read every derived output.

Signal Percent:64.0 %

Physical Value:64.0

Result: Signal Percent = 64.0 %

Final Answer

64.0

Worked Examples

See how the calculator works with different scenarios.

Scenario

TPS position check.

Inputs

Ref:5 V

Signal:3.2 V

Range:0-100

Calculation

64% → 64 units

Result

64% throttle.

Interpretation

Sweep 0-100% smoothly; dropouts mean a worn track.

Understanding Your Result

Your Result: Signal Percent: 64.0 %

What This Means

Sensor voltage decoded to percent and engineering units.

Why It Matters

Tests any 5-V sensor with a multimeter and its scale.

Professional Interpretation

Treat the primary result as a planning estimate, then validate on a dyno, at the track, or with logged sensor data. If measured numbers disagree by more than ~10%, re-check inputs (units are the usual culprit) before changing parts.

Recommendations

•Double-check units on every input before trusting the result
•Compare against the worked example below to sanity-check magnitude
•Validate with measured data (dyno, timeslip, datalog) when it matters

Learn — fuel economy, deeply

Five-volt sensors speak in percent of their supply.

1 · Where the gallon goes (energy path)

Engine heat

60–70% lost

Coolant + exhaust carry most energy away. Hybrids recover some via Atkinson cycle + regen.

Driveline

5–15% lost

Transmission, differential, accessories. CVTs and 8–10 speed autos lose less.

Aero drag

∝ v²

Doubles from 55→78 mph. Roof boxes hurt more than trunks.

Rolling + brakes

10–20%

Tires, weight, stops. Regen braking (hybrid/EV) reclaims city braking energy.

4 · Measure like a pro (the 3-tank protocol)

Fill to first click at the same pump, record the odometer (Tank 0).
Drive normally for 2–3 tanks; always refill to first click at the same pump.
MPG = total miles ÷ total gallons across all tanks — averaging kills pump-click noise.
Cross-check with the trip computer; a persistent >10% gap means the computer needs calibration — or the car needs service.
Log with an OBD-II dongle for per-trip MPG if you want to isolate commute vs. highway behavior.

Practical Tips

•Backprobe, never pierce wires
•Sweep-test TPS/pedals slowly
•Graphing meters beat numbers here

Common Mistakes

Mixing units (inches with mm, psi with kPa)

Convert every input to the unit shown on its field before calculating.

Trusting a single output blindly

Cross-check with the worked example and, when it matters, a dyno or datalog.

Assumptions

This calculator makes the following assumptions to provide estimates:

Steady-state model: Formulas assume stabilized conditions; transients, heat soak and traction limits are excluded.

Standard factors: Empirical constants (BSFC, VE, drivetrain loss) use typical values — your combination may differ.

Limitations

Be aware of these limitations when using this calculator:

Estimate, not measurement: Predictions carry real-world scatter of roughly ±5–15% depending on the model.

No transient effects: Shift time, wheelspin, spool lag and heat soak are not modeled here.

Frequently Asked Questions

Answers to common questions about this calculator.

Why measure the 5-V reference?

Low reference (4.6 V) skews every reading high-percent. Confirm supply before condemning sensors.

What voltages are bad?

Stuck at 0 or 5 V (open/short), or dropouts mid-sweep (worn TPS/pedal tracks).

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Related Guides

Deepen your understanding with these educational resources.

Automotive Guides

Build planning, measurement protocol and validation how-tos

Glossary

Technical terms used in mortgage calculations explained in plain language.

MPG: Miles per gallon. Distance travelled per gallon of fuel; higher is better. US gallon = 3.785 L.
L/100 km: Litres consumed per 100 kilometres; lower is better. Standard metric efficiency unit.
MPGe: Miles per gallon-equivalent. EV metric: miles travelled on 33.7 kWh (energy of 1 gal of gasoline).
CAFE: Corporate Average Fuel Economy — US fleet-average efficiency standard enforced by NHTSA.
Rolling resistance: Energy lost deforming tires as they roll. Low-pressure or wide tires raise it.
Aerodynamic drag: Air resistance growing with the square of speed — why highway MPG falls fast above 60 mph.
Hypermiling: Driving techniques (coasting, steady speed, anticipation) that maximise real-world MPG.
OBD-II: On-board diagnostics port. Scanners and dongles read live MPG, fuel trim and fault codes.

Authoritative References

Trusted sources and standards referenced by this calculator.

EPA — FuelEconomy.gov DOE — Fuel-Efficient Driving Tips NHTSA — Driving Safety & Efficiency SAE International — Fuel Economy Standards Consumer Reports — MPG Truth IRS — Standard Mileage Rates

Applicable Standards

EPA Fuel Economy Testing (40 CFR Part 600)CAFE — Corporate Average Fuel Economy Standards (NHTSA)WLTP — Worldwide Harmonised Light Vehicle Test ProcedureSAE J1321 / J1711 — Fuel consumption test proceduresISO 2575 — Road vehicles symbols & efficiency markings

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Last Updated:

2026-09-27

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.