calculatorAll Calculators
34 calculatorsEngineering
Ohm's Law
Current from voltage and resistance (I = V / R).
Other
Rule of Three
Solve proportions: if A gives B, what does C give?
Gaming
XP per Hour
Your grind rate — experience earned divided by hours played.
Ecology
Driving CO₂
The CO₂ emitted by a car trip, from distance and an emission factor.
Pregnancy & Parenting
Daily Milk Intake
A newborn's typical daily formula amount from body weight (about 150 ml per kg).
Chemistry
Molarity
The molar concentration of a solution from moles and volume.
Music & Audio
BPM to Milliseconds
Milliseconds per beat from a tempo — for delays and LFO sync.
Photography & Video
Clip Duration
How long a clip runs, from its frame count and frame rate.
Gardening & Agriculture
Plants per Row
How many plants fit in a row, from its length and plant spacing.
Biology
Cell Density
Cells per millilitre from a count and sample volume.