Mutual Fund Expense Ratio Calculator

A fund charge of 0.95% looks tiny on a factsheet, yet over twenty years it can quietly swallow a five figure sum. This mutual fund expense ratio calculator puts two funds side by side and shows how much each charge takes from your pot. In the UK the same figure is called the OCF, or ongoing charges figure, and you can enter whichever your provider shows.

Quick answer: A mutual fund expense ratio calculator grows your money each year by (1 + return) × (1 − total charges). Starting with £10,000 and adding £200 a month for 20 years at 6%, with a 0.25% platform fee, a 0.95% fund ends at about £103,960 and a 0.15% tracker at about £116,100.

What Is an Expense Ratio or OCF?

An expense ratio is the yearly cost of running a fund, taken as a percentage of the money you have in it. You never see a bill: the charge comes out of the fund's value bit by bit, so your returns are simply lower. UK funds publish this as the OCF on their key information document, while US funds use the term expense ratio.

The calculator grows your money each year by (1 + return) × (1 − total charges), adding your monthly payments as it goes. Take Daniel, who starts with £10,000 and adds £200 a month for 20 years, assuming 6% a year before fees and a 0.25% platform fee. In an active fund charging 0.95%, he ends with about £103,960. In a tracker charging 0.15% he ends with about £116,100, so the cheaper fund leaves him roughly £12,140 better off from the same savings and the same market.

How to Use the Mutual Fund Expense Ratio Calculator

Step 1: Enter What You Invest

Choose a currency, then type your starting lump sum and how much you plan to add each month. Leave the monthly figure at zero if you are investing a single sum.

Step 2: Set the Return and Time Frame

Pick a yearly return before charges and the number of years. Use a cautious figure, as markets rise and fall. Running the same numbers through the inflation calculator afterwards shows what the final pot might be worth in today's money.

Step 3: Enter the Fund Charges

Type the OCF or expense ratio for each fund, plus any platform or adviser fee charged as a percentage. Most providers show the charge on the fund's factsheet, and an overview of expense ratios explains which running costs it covers and which it leaves out, such as dealing costs inside the fund.

Step 4: Compare the Results

The headline shows the extra you keep with the cheaper fund. Below it are both final values, the total Fund A charges cost you including the growth they would have earned, and a table showing how the gap widens over time.

Why Small Charges Add Up

Charges compound just like returns do, only in the wrong direction. Every pound taken in fees is a pound that can no longer grow, which is why the gap in the table speeds up in later years. The compound interest calculator shows the same effect from the growth side if you want to test a single rate.

• A higher charge is only worth paying if the fund consistently beats a cheaper alternative by more than the extra cost.
• Check the full cost, including platform fees and any adviser charge, not just the OCF.
• Index trackers often charge well under 0.25%, while many actively managed funds charge 0.75% or more.

Before you switch funds or platforms, the MoneyHelper guide to investing is worth a read, as it explains how fees reduce returns and why your attitude to risk matters as much as cost.

Key Mutual Fund Expense Ratio Terms Explained

These investing terms explain what the mutual fund expense ratio calculator measures, helping you compare fund charges and understand how small percentages shape long term returns.

Expense ratio

The share of a fund's assets used each year to cover its running costs, such as management, administration and custody. It is deducted from the fund's value rather than billed, so investors see it only as a slightly lower return.

Ongoing charges figure

The UK and European name for a fund's yearly running costs expressed as a percentage, published in its key investor documents. It covers most recurring costs but excludes trading costs incurred when the fund buys and sells holdings.

Platform fee

A charge made by an investment platform or wrapper provider for holding your funds, usually a percentage of the account value or a flat fee. It applies on top of fund charges, so both must be counted when comparing total costs.

Index fund

A fund that aims to match the performance of a market index by holding its constituents, rather than picking investments. Because it needs little research or trading, it typically charges much less than an actively managed fund.

Active management

An approach in which a fund manager selects investments with the aim of beating a benchmark. Higher research and dealing costs mean higher charges, which only pay off if the fund outperforms by more than the extra cost.

Fee drag

The cumulative reduction in an investment's value caused by charges compounding over time. Each pound removed in fees also loses all the growth it would have earned, so the gap between cheap and expensive funds widens every year.

Frequently Asked Questions