— Everyday Math
Everyday Math Calculators
The everyday math you actually reach for — percentages, discounts, tips, markups, and the quick ratios in between.
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- Percentage Calculator The three percentage questions everyone needs, in one place: what is X% of Y, what percent X is of Y, and the reverse — X is Y% of what number. Pick a mode and enter the two values; it also shows the decimal and fraction equivalents and handles chained percentages.
- Percentage of Total Calculator Work out what percentage a part is of a total — or paste a whole list of values and see each one as a percentage of their sum, with the running cumulative share. There’s a reverse mode too: if X is Y% of a total, what is the total?
- Reverse Percentage Calculator The undo button for percentages. You have the figure after a discount, a tax or a markup was applied, and you want the original — the pre-discount price, the pre-tax amount, the number before it grew. Pick which way the percentage went and this works backwards to the starting value.
- Percentage Difference Calculator Comparing two independent values where neither is the “original” — two lab readings, two vendor quotes, two measurements? That’s a percentage difference, not a percentage change. It divides by the average of the two, so the order doesn’t matter and the answer is always positive.
- Proportion Calculator Solve a proportion where two ratios are equal: a : b = c : d. Enter the three known values, choose the missing position, and the calculator cross-multiplies to find the fourth, with support for inverse proportion too.
- Percentage Change Calculator The signed percentage change between two numbers — one tool for both directions. Positive means it went up, negative means down. Built for comparing periods: revenue year-over-year, a metric this month versus last, a price now versus then.
- Percentage Increase Calculator Work out a percentage increase two ways: find the percentage a value grew from old to new — a pay rise, a price hike, a year of growth — or apply an increase to a number to get the new figure. It shows the absolute change and the multiplier too.
- Percentage Decrease Calculator Work out a percentage decrease two ways: find the percentage a value fell from old to new — a price drop, a decline, a loss — or apply a reduction to a number to get the new figure. It shows the absolute change and the multiplier too.
- Growth Rate Calculator Calculate growth three ways: simple percentage change, compound annual growth rate (CAGR), or average growth across a series. Enter the values to see the rate, total growth, period-by-period breakdown, and optional inflation-adjusted result.
- Basis Points Calculator Convert basis points to percentages, decimals, or rate changes. One basis point is 0.01%, so this helps translate small finance moves, apply them to a base rate, and optionally estimate the fee or interest cost on an amount.
- Discount Calculator Enter a price and a discount to see what you pay and what you save — take a percentage or a flat amount off, stack two or three offers, add sales tax, or work backwards from a sale price to the percentage off.
- Tip Calculator Enter the bill and a tip percentage to see the tip and the total — then split it between any number of people, round up to a clean figure, or tip on the pre-tax amount. Tap a preset for the usual 15, 18 or 20%.
- Markup Percentage Calculator Markup is profit measured against cost — the amount you add to what something costs you to set its selling price. Enter the cost and either the price or the markup, and the calculator solves for the rest: the markup percentage, the profit, and the equivalent profit margin.
- Margin Percentage Calculator Margin is profit measured against the selling price — the share of each sale you keep as gross profit. Enter the cost and either the price or a target margin, and the calculator solves for the rest: the margin percentage, the profit, and the equivalent markup.
- Profit Percentage Calculator Calculate profit percentage without mixing up markup and margin. Enter cost and price, or revenue and profit, choose the base for the headline figure, and see both profit on cost and profit on revenue clearly labelled.
- Loss Percentage Calculator Calculate loss when something sells for less than it cost. Enter cost and selling price to see the loss percentage, money lost, breakeven price, and whether the percentage is measured on cost or on sale price.
- Average Calculator Type, comma-separate or paste a list of numbers to get the mean, median, mode, range and count at once — with optional standard deviation, variance and the geometric and harmonic means, a running-sum table, and a chart of how the data is distributed.
- Weighted Average Calculator Calculate a weighted average where some values count more than others. Enter values and weights to see the weighted result beside the plain average, useful for GPAs, course grades, weighted scores, and any mix where each item has different importance.
- Ratio Calculator Everything you do with a ratio in one place: simplify it to its lowest terms, solve a proportion to find a missing value, scale it up or down, or convert it to a fraction, decimal and percentage. Works with two- or three-part ratios.
Percentages 5
- Percentage Calculator The three percentage questions everyone needs, in one place: what is X% of Y, what percent X is of Y, and the reverse — X is Y% of what number. Pick a mode and enter the two values; it also shows the decimal and fraction equivalents and handles chained percentages.
- Percentage Difference Calculator Comparing two independent values where neither is the “original” — two lab readings, two vendor quotes, two measurements? That’s a percentage difference, not a percentage change. It divides by the average of the two, so the order doesn’t matter and the answer is always positive.
- Percentage of Total Calculator Work out what percentage a part is of a total — or paste a whole list of values and see each one as a percentage of their sum, with the running cumulative share. There’s a reverse mode too: if X is Y% of a total, what is the total?
- Proportion Calculator Solve a proportion where two ratios are equal: a : b = c : d. Enter the three known values, choose the missing position, and the calculator cross-multiplies to find the fourth, with support for inverse proportion too.
- Reverse Percentage Calculator The undo button for percentages. You have the figure after a discount, a tax or a markup was applied, and you want the original — the pre-discount price, the pre-tax amount, the number before it grew. Pick which way the percentage went and this works backwards to the starting value.
Change & growth 5
- Basis Points Calculator Convert basis points to percentages, decimals, or rate changes. One basis point is 0.01%, so this helps translate small finance moves, apply them to a base rate, and optionally estimate the fee or interest cost on an amount.
- Growth Rate Calculator Calculate growth three ways: simple percentage change, compound annual growth rate (CAGR), or average growth across a series. Enter the values to see the rate, total growth, period-by-period breakdown, and optional inflation-adjusted result.
- Percentage Change Calculator The signed percentage change between two numbers — one tool for both directions. Positive means it went up, negative means down. Built for comparing periods: revenue year-over-year, a metric this month versus last, a price now versus then.
- Percentage Decrease Calculator Work out a percentage decrease two ways: find the percentage a value fell from old to new — a price drop, a decline, a loss — or apply a reduction to a number to get the new figure. It shows the absolute change and the multiplier too.
- Percentage Increase Calculator Work out a percentage increase two ways: find the percentage a value grew from old to new — a pay rise, a price hike, a year of growth — or apply an increase to a number to get the new figure. It shows the absolute change and the multiplier too.
Shopping & money 4
- Discount Calculator Enter a price and a discount to see what you pay and what you save — take a percentage or a flat amount off, stack two or three offers, add sales tax, or work backwards from a sale price to the percentage off.
- Margin Percentage Calculator Margin is profit measured against the selling price — the share of each sale you keep as gross profit. Enter the cost and either the price or a target margin, and the calculator solves for the rest: the margin percentage, the profit, and the equivalent markup.
- Markup Percentage Calculator Markup is profit measured against cost — the amount you add to what something costs you to set its selling price. Enter the cost and either the price or the markup, and the calculator solves for the rest: the markup percentage, the profit, and the equivalent profit margin.
- Tip Calculator Enter the bill and a tip percentage to see the tip and the total — then split it between any number of people, round up to a clean figure, or tip on the pre-tax amount. Tap a preset for the usual 15, 18 or 20%.
Profit & loss 2
- Loss Percentage Calculator Calculate loss when something sells for less than it cost. Enter cost and selling price to see the loss percentage, money lost, breakeven price, and whether the percentage is measured on cost or on sale price.
- Profit Percentage Calculator Calculate profit percentage without mixing up markup and margin. Enter cost and price, or revenue and profit, choose the base for the headline figure, and see both profit on cost and profit on revenue clearly labelled.
Averages & ratios 3
- Average Calculator Type, comma-separate or paste a list of numbers to get the mean, median, mode, range and count at once — with optional standard deviation, variance and the geometric and harmonic means, a running-sum table, and a chart of how the data is distributed.
- Ratio Calculator Everything you do with a ratio in one place: simplify it to its lowest terms, solve a proportion to find a missing value, scale it up or down, or convert it to a fraction, decimal and percentage. Works with two- or three-part ratios.
- Weighted Average Calculator Calculate a weighted average where some values count more than others. Enter values and weights to see the weighted result beside the plain average, useful for GPAs, course grades, weighted scores, and any mix where each item has different importance.
- Average Calculator Type, comma-separate or paste a list of numbers to get the mean, median, mode, range and count at once — with optional standard deviation, variance and the geometric and harmonic means, a running-sum table, and a chart of how the data is distributed.
- Basis Points Calculator Convert basis points to percentages, decimals, or rate changes. One basis point is 0.01%, so this helps translate small finance moves, apply them to a base rate, and optionally estimate the fee or interest cost on an amount.
- Discount Calculator Enter a price and a discount to see what you pay and what you save — take a percentage or a flat amount off, stack two or three offers, add sales tax, or work backwards from a sale price to the percentage off.
- Growth Rate Calculator Calculate growth three ways: simple percentage change, compound annual growth rate (CAGR), or average growth across a series. Enter the values to see the rate, total growth, period-by-period breakdown, and optional inflation-adjusted result.
- Loss Percentage Calculator Calculate loss when something sells for less than it cost. Enter cost and selling price to see the loss percentage, money lost, breakeven price, and whether the percentage is measured on cost or on sale price.
- Margin Percentage Calculator Margin is profit measured against the selling price — the share of each sale you keep as gross profit. Enter the cost and either the price or a target margin, and the calculator solves for the rest: the margin percentage, the profit, and the equivalent markup.
- Markup Percentage Calculator Markup is profit measured against cost — the amount you add to what something costs you to set its selling price. Enter the cost and either the price or the markup, and the calculator solves for the rest: the markup percentage, the profit, and the equivalent profit margin.
- Percentage Calculator The three percentage questions everyone needs, in one place: what is X% of Y, what percent X is of Y, and the reverse — X is Y% of what number. Pick a mode and enter the two values; it also shows the decimal and fraction equivalents and handles chained percentages.
- Percentage Change Calculator The signed percentage change between two numbers — one tool for both directions. Positive means it went up, negative means down. Built for comparing periods: revenue year-over-year, a metric this month versus last, a price now versus then.
- Percentage Decrease Calculator Work out a percentage decrease two ways: find the percentage a value fell from old to new — a price drop, a decline, a loss — or apply a reduction to a number to get the new figure. It shows the absolute change and the multiplier too.
- Percentage Difference Calculator Comparing two independent values where neither is the “original” — two lab readings, two vendor quotes, two measurements? That’s a percentage difference, not a percentage change. It divides by the average of the two, so the order doesn’t matter and the answer is always positive.
- Percentage Increase Calculator Work out a percentage increase two ways: find the percentage a value grew from old to new — a pay rise, a price hike, a year of growth — or apply an increase to a number to get the new figure. It shows the absolute change and the multiplier too.
- Percentage of Total Calculator Work out what percentage a part is of a total — or paste a whole list of values and see each one as a percentage of their sum, with the running cumulative share. There’s a reverse mode too: if X is Y% of a total, what is the total?
- Profit Percentage Calculator Calculate profit percentage without mixing up markup and margin. Enter cost and price, or revenue and profit, choose the base for the headline figure, and see both profit on cost and profit on revenue clearly labelled.
- Proportion Calculator Solve a proportion where two ratios are equal: a : b = c : d. Enter the three known values, choose the missing position, and the calculator cross-multiplies to find the fourth, with support for inverse proportion too.
- Ratio Calculator Everything you do with a ratio in one place: simplify it to its lowest terms, solve a proportion to find a missing value, scale it up or down, or convert it to a fraction, decimal and percentage. Works with two- or three-part ratios.
- Reverse Percentage Calculator The undo button for percentages. You have the figure after a discount, a tax or a markup was applied, and you want the original — the pre-discount price, the pre-tax amount, the number before it grew. Pick which way the percentage went and this works backwards to the starting value.
- Tip Calculator Enter the bill and a tip percentage to see the tip and the total — then split it between any number of people, round up to a clean figure, or tip on the pre-tax amount. Tap a preset for the usual 15, 18 or 20%.
- Weighted Average Calculator Calculate a weighted average where some values count more than others. Enter values and weights to see the weighted result beside the plain average, useful for GPAs, course grades, weighted scores, and any mix where each item has different importance.