Rekenmachines

Free online calculators for percentages, margins, fees, taxes, dates, fitness and more — fast and accurate.

Percentagecalculator

Percent (X%) Of value (Y) Part (for reverse)

Work out a percentage of a number, or what percentage one number is of another.

Numbers (comma or space separated)

Calculate the mean, median, sum, count, minimum and maximum of a list of numbers.

Cost Revenue (or leave 0) Target margin % (if no revenue)

Find profit, margin and markup from cost and revenue — or the revenue needed for a target margin.

Original price Discount %

See the final price after a discount and how much you save.

Amount Rate % Mode

Add or remove GST/VAT at any rate to get net, tax and gross amounts.

Amount Percent fee % Fixed fee

Estimate PayPal fees and the amount to request so you receive what you need.

Amount Percent fee % Fixed fee

Estimate Stripe processing fees and the charge needed to net a target amount.

Campaign cost Impressions CPM (leave 0 to solve)

Calculate CPM, total cost or impressions for an ad campaign — fill any two.

P(A) — 0 to 1 P(B) — 0 to 1

Compute the probability of A and B, A or B, not A, and neither for independent events.

Sample mean Standard deviation Sample size (n) Confidence level

Find the confidence interval for a mean at 90%, 95% or 99% confidence.

Start date End date

Count the number of days, weeks and months between two dates.

Start time End time

Work out the hours and minutes between two times, including overnight shifts.

Start date End date

Count the whole months — and years plus months — between two dates.

Gender Age Height (cm) Weight (kg) Activity level

Estimate your Total Daily Energy Expenditure (TDEE) and calorie targets for weight goals.