Spike's Calculators

Calculating the amount after applying a surcharge percentage.

#### Calculator

#### Results

- enter the starting amount
- surcharge in percentage
- the number of digits you want in your result

- the amount of the surcharge
- the amount after the surcharge percentage is applied

Calculating what the surcharge percentage is from starting amount with the surcharge amount.
#### Calculator

#### Results

- enter the starting amount
- the surcharge amount
- the number of digits you want in your result

- the surcharge in a percentage
- the amount including surcharge

Calculating what the surcharge percentage is from starting amount and final amount.
#### Calculator

#### Result

- enter the starting amount
- enter the final amount
- the number of digits you want in your result

- the surcharge in a percentage

- Compound Interest
- Discount in Percentages
- Elevation from Slope Percentage
- Fraction to Decimal and Percent
- Number of a Number Percentage
- Number to Percent
- Percent of a Percent
- Percent to Fraction
- Percentage Amount to a 100% Amount
- Percentage Amount from a Starting Amount
- Slope of a Driveway in a Percentage
- Surcharge in Percentages