Calculators that show their working
Every tool on CalcMyWay shows the formula behind its result, a worked example, and the source the numbers come from.
Most used
Compound Interest
Calculate compound interest from a starting balance, regular contributions and any compounding frequency. See year-by-year growth and total interest earned.
Final Grade
Find out what score you need on your final exam to reach the grade you want. Enter your current grade and the exam weight to see the required mark.
Volume
Calculate the volume of a box, cylinder, sphere, cone, pyramid or capsule from its dimensions. Results in cubic units, litres and US gallons.
Ratio
Simplify a ratio to its lowest terms, solve a proportion for a missing value, or scale a ratio up and down. Shows the working at every step.
Statistics
Calculate mean, median, mode, range, variance, standard deviation and quartiles from any data set. Paste your numbers and see every step of the working.
401(k)
Project your 401(k) balance at retirement from your salary, contribution rate and employer match. Includes 2026 IRS limits and catch-up contributions.
Weighted Grade
Calculate your weighted course grade from category scores and their weights. Handles incomplete weights and shows how much each category moves your average.
CD
Calculate what a certificate of deposit pays at maturity from the APY and term. Shows interest earned, effective yield and the cost of early withdrawal.
Mortgage
Calculate your monthly mortgage payment including property tax, insurance, PMI and HOA fees. Full amortization schedule and total interest over the loan.
Refinance
Work out whether refinancing is worth it. Compares your current mortgage against a new one and shows the break-even month on closing costs.
Credit Card Payoff
See how long a credit card balance takes to clear and what the interest costs. Compares minimum payments against a fixed amount you choose.
Concrete
Calculate how much concrete a slab, footing, column or set of steps needs. Results in cubic yards, cubic feet and 40, 60 or 80 lb bags, with waste included.
Electricity Cost
Work out what any appliance costs to run per hour, day, month and year from its wattage and your electricity rate. Includes standby power.
Pace
Calculate running pace, finish time or distance from any two of the three. Converts between min/mile and min/km and splits every standard race distance.
Percentage
Calculate what is X% of Y, what percent one number is of another, percentage increase or decrease, and reverse percentages. Shows the working each time.
Fraction
Add, subtract, multiply or divide fractions and see every step. Results in lowest terms, as a mixed number and as a decimal.
Quadratic Formula
Solve any quadratic equation with the quadratic formula. Shows the discriminant, both roots, the vertex, the axis of symmetry and the factored form.